diff --git a/adb/Android.bp b/adb/Android.bp
index b9a1596..99de54e 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -222,7 +222,6 @@
 
 cc_binary_host {
     name: "adb",
-    tags: ["debug"],
 
     defaults: ["adb_defaults"],
 
diff --git a/adb/adb.cpp b/adb/adb.cpp
index 7fc4cc2..f8a54c6 100644
--- a/adb/adb.cpp
+++ b/adb/adb.cpp
@@ -365,8 +365,8 @@
         switch (p->msg.arg0) {
 #if ADB_HOST
             case ADB_AUTH_TOKEN:
-                if (t->GetConnectionState() == kCsOffline) {
-                    t->SetConnectionState(kCsUnauthorized);
+                if (t->GetConnectionState() != kCsAuthorizing) {
+                    t->SetConnectionState(kCsAuthorizing);
                 }
                 send_auth_response(p->payload.data(), p->msg.data_length, t);
                 break;
@@ -1101,14 +1101,11 @@
     if (!strcmp(service, "reconnect-offline")) {
         std::string response;
         close_usb_devices([&response](const atransport* transport) {
-            switch (transport->GetConnectionState()) {
-                case kCsOffline:
-                case kCsUnauthorized:
-                    response += "reconnecting " + transport->serial_name() + "\n";
-                    return true;
-                default:
-                    return false;
+            if (!ConnectionStateIsOnline(transport->GetConnectionState())) {
+                response += "reconnecting " + transport->serial_name() + "\n";
+                return true;
             }
+            return false;
         });
         if (!response.empty()) {
             response.resize(response.size() - 1);
diff --git a/adb/adb.h b/adb/adb.h
index 1e58ee1..ede55da 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -95,16 +95,33 @@
 
 enum ConnectionState {
     kCsAny = -1,
-    kCsOffline = 0,
+
+    kCsConnecting = 0,  // Haven't received a response from the device yet.
+    kCsAuthorizing,     // Authorizing with keys from ADB_VENDOR_KEYS.
+    kCsUnauthorized,    // ADB_VENDOR_KEYS exhausted, fell back to user prompt.
+    kCsNoPerm,          // Insufficient permissions to communicate with the device.
+    kCsOffline,
+
     kCsBootloader,
     kCsDevice,
     kCsHost,
     kCsRecovery,
-    kCsNoPerm,  // Insufficient permissions to communicate with the device.
     kCsSideload,
-    kCsUnauthorized,
 };
 
+inline bool ConnectionStateIsOnline(ConnectionState state) {
+    switch (state) {
+        case kCsBootloader:
+        case kCsDevice:
+        case kCsHost:
+        case kCsRecovery:
+        case kCsSideload:
+            return true;
+        default:
+            return false;
+    }
+}
+
 void print_packet(const char* label, apacket* p);
 
 // These use the system (v)fprintf, not the adb prefixed ones defined in sysdeps.h, so they
diff --git a/adb/client/auth.cpp b/adb/client/auth.cpp
index ade2623..0f4dd33 100644
--- a/adb/client/auth.cpp
+++ b/adb/client/auth.cpp
@@ -464,6 +464,7 @@
     std::shared_ptr<RSA> key = t->NextKey();
     if (key == nullptr) {
         // No more private keys to try, send the public key.
+        t->SetConnectionState(kCsUnauthorized);
         send_auth_publickey(t);
         return;
     }
diff --git a/adb/client/commandline.cpp b/adb/client/commandline.cpp
index e476e07..39983ab 100644
--- a/adb/client/commandline.cpp
+++ b/adb/client/commandline.cpp
@@ -149,8 +149,8 @@
         " emu COMMAND              run emulator console command\n"
         "\n"
         "app installation:\n"
-        " install [-lrtsdg] PACKAGE\n"
-        " install-multiple [-lrtsdpg] PACKAGE...\n"
+        " install [-lrtsdg] [--instant] PACKAGE\n"
+        " install-multiple [-lrtsdpg] [--instant] PACKAGE...\n"
         "     push package(s) to the device and install them\n"
         "     -l: forward lock application\n"
         "     -r: replace existing application\n"
@@ -159,6 +159,7 @@
         "     -d: allow version code downgrade (debuggable packages only)\n"
         "     -p: partial application install (install-multiple only)\n"
         "     -g: grant all runtime permissions\n"
+        "     --instant: cause the app to be installed as an ephemeral install app\n"
         " uninstall [-k] PACKAGE\n"
         "     remove this app package from the device\n"
         "     '-k': keep the data and cache directories\n"
diff --git a/adb/client/main.cpp b/adb/client/main.cpp
index 31cb853..44ed3a2 100644
--- a/adb/client/main.cpp
+++ b/adb/client/main.cpp
@@ -117,6 +117,7 @@
     atexit(adb_server_cleanup);
 
     init_transport_registration();
+    init_reconnect_handler();
     init_mdns_transport_discovery();
 
     usb_init();
diff --git a/adb/daemon/jdwp_service.cpp b/adb/daemon/jdwp_service.cpp
index 211d8f3..367695d 100644
--- a/adb/daemon/jdwp_service.cpp
+++ b/adb/daemon/jdwp_service.cpp
@@ -289,8 +289,6 @@
                 goto CloseProcess;
             }
 
-            adb_close(fd);
-
             D("sent file descriptor %d to JDWP process %d", fd, proc->pid);
 
             proc->out_fds.pop_back();
diff --git a/adb/daemon/remount_service.cpp b/adb/daemon/remount_service.cpp
index d679a6d..eb46903 100644
--- a/adb/daemon/remount_service.cpp
+++ b/adb/daemon/remount_service.cpp
@@ -21,18 +21,23 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <mntent.h>
+#include <spawn.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/mount.h>
+#include <sys/vfs.h>
 #include <unistd.h>
 
 #include <string>
+#include <vector>
 
 #include <android-base/properties.h>
+#include <ext4_utils/ext4_utils.h>
 
 #include "adb.h"
 #include "adb_io.h"
+#include "adb_unique_fd.h"
 #include "adb_utils.h"
 #include "fs_mgr.h"
 
@@ -82,7 +87,62 @@
     return result;
 }
 
-static bool remount_partition(int fd, const char* dir) {
+static bool fs_has_shared_blocks(const char* dev) {
+    struct statfs fs;
+    if (statfs(dev, &fs) == -1 || fs.f_type == EXT4_SUPER_MAGIC) {
+        return false;
+    }
+    unique_fd fd(unix_open(dev, O_RDONLY));
+    if (fd < 0) {
+        return false;
+    }
+    struct ext4_super_block sb;
+    if (lseek64(fd, 1024, SEEK_SET) < 0 || unix_read(fd, &sb, sizeof(sb)) < 0) {
+        return false;
+    }
+    struct fs_info info;
+    if (ext4_parse_sb(&sb, &info) < 0) {
+        return false;
+    }
+    return (info.feat_ro_compat & EXT4_FEATURE_RO_COMPAT_SHARED_BLOCKS) != 0;
+}
+
+static bool can_unshare_blocks(int fd, const char* dev) {
+    const char* E2FSCK_BIN = "/system/bin/e2fsck";
+    if (access(E2FSCK_BIN, X_OK)) {
+        WriteFdFmt(fd, "e2fsck is not available, cannot undo deduplication on %s\n", dev);
+        return false;
+    }
+
+    pid_t child;
+    char* env[] = {nullptr};
+    const char* argv[] = {E2FSCK_BIN, "-n", "-E", "unshare_blocks", dev, nullptr};
+    if (posix_spawn(&child, E2FSCK_BIN, nullptr, nullptr, const_cast<char**>(argv), env)) {
+        WriteFdFmt(fd, "failed to e2fsck to check deduplication: %s\n", strerror(errno));
+        return false;
+    }
+    int status = 0;
+    int ret = TEMP_FAILURE_RETRY(waitpid(child, &status, 0));
+    if (ret < 0) {
+        WriteFdFmt(fd, "failed to get e2fsck status: %s\n", strerror(errno));
+        return false;
+    }
+    if (!WIFEXITED(status)) {
+        WriteFdFmt(fd, "e2fsck exited abnormally with status %d\n", status);
+        return false;
+    }
+    int rc = WEXITSTATUS(status);
+    if (rc != 0) {
+        WriteFdFmt(fd,
+                   "%s is deduplicated, and an e2fsck check failed. It might not "
+                   "have enough free-space to be remounted as writable.\n",
+                   dev);
+        return false;
+    }
+    return true;
+}
+
+static bool remount_partition(int fd, const char* dir, std::vector<std::string>& dedup) {
     if (!directory_exists(dir)) {
         return true;
     }
@@ -108,6 +168,15 @@
         return false;
     }
     if (mount(dev.c_str(), dir, "none", MS_REMOUNT, nullptr) == -1) {
+        if (errno == EROFS && fs_has_shared_blocks(dev.c_str())) {
+            if (!can_unshare_blocks(fd, dev.c_str())) {
+                return false;
+            }
+            // We return true so remount_service() can detect that the only
+            // failure was deduplicated filesystems.
+            dedup.push_back(dev);
+            return true;
+        }
         WriteFdFmt(fd, "remount of the %s superblock failed: %s\n", dir, strerror(errno));
         return false;
     }
@@ -140,17 +209,29 @@
     }
 
     bool success = true;
+    std::vector<std::string> dedup;
     if (android::base::GetBoolProperty("ro.build.system_root_image", false)) {
-        success &= remount_partition(fd, "/");
+        success &= remount_partition(fd, "/", dedup);
     } else {
-        success &= remount_partition(fd, "/system");
+        success &= remount_partition(fd, "/system", dedup);
     }
-    success &= remount_partition(fd, "/odm");
-    success &= remount_partition(fd, "/oem");
-    success &= remount_partition(fd, "/product");
-    success &= remount_partition(fd, "/vendor");
+    success &= remount_partition(fd, "/odm", dedup);
+    success &= remount_partition(fd, "/oem", dedup);
+    success &= remount_partition(fd, "/product", dedup);
+    success &= remount_partition(fd, "/vendor", dedup);
 
-    WriteFdExactly(fd, success ? "remount succeeded\n" : "remount failed\n");
+    if (!success) {
+        WriteFdExactly(fd, "remount failed\n");
+    } else if (dedup.empty()) {
+        WriteFdExactly(fd, "remount succeeded\n");
+    } else {
+        WriteFdExactly(fd,
+                       "The following partitions are deduplicated and could "
+                       "not be remounted:\n");
+        for (const std::string& name : dedup) {
+            WriteFdFmt(fd, "  %s\n", name.c_str());
+        }
+    }
 
     adb_close(fd);
 }
diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index ab11bdd..c724b11 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -234,6 +234,10 @@
     for (unsigned i = 0; i < USB_FFS_NUM_BUFS; i++) {
         aiob->iocbs[i] = &aiob->iocb[i];
     }
+    memset(&aiob->ctx, 0, sizeof(aiob->ctx));
+    if (io_setup(USB_FFS_NUM_BUFS, &aiob->ctx)) {
+        D("[ aio: got error on io_setup (%d) ]", errno);
+    }
 }
 
 static int getMaxPacketSize(int ffs_fd) {
@@ -312,13 +316,6 @@
         goto err;
     }
 
-    memset(&h->read_aiob.ctx, 0, sizeof(h->read_aiob.ctx));
-    memset(&h->write_aiob.ctx, 0, sizeof(h->write_aiob.ctx));
-    if (io_setup(USB_FFS_NUM_BUFS, &h->read_aiob.ctx) ||
-        io_setup(USB_FFS_NUM_BUFS, &h->write_aiob.ctx)) {
-        D("[ aio: got error on io_setup (%d) ]", errno);
-    }
-
     h->read_aiob.fd = h->bulk_out;
     h->write_aiob.fd = h->bulk_in;
     return true;
@@ -439,23 +436,29 @@
         num_bufs += 1;
     }
 
-    if (io_submit(aiob->ctx, num_bufs, aiob->iocbs.data()) < num_bufs) {
-        D("[ aio: got error submitting %s (%d) ]", read ? "read" : "write", errno);
-        return -1;
-    }
-    if (TEMP_FAILURE_RETRY(
-            io_getevents(aiob->ctx, num_bufs, num_bufs, aiob->events.data(), nullptr)) < num_bufs) {
-        D("[ aio: got error waiting %s (%d) ]", read ? "read" : "write", errno);
-        return -1;
-    }
-    for (int i = 0; i < num_bufs; i++) {
-        if (aiob->events[i].res < 0) {
-            errno = aiob->events[i].res;
-            D("[ aio: got error event on %s (%d) ]", read ? "read" : "write", errno);
+    while (true) {
+        if (TEMP_FAILURE_RETRY(io_submit(aiob->ctx, num_bufs, aiob->iocbs.data())) < num_bufs) {
+            PLOG(ERROR) << "aio: got error submitting " << (read ? "read" : "write");
             return -1;
         }
+        if (TEMP_FAILURE_RETRY(io_getevents(aiob->ctx, num_bufs, num_bufs, aiob->events.data(),
+                                            nullptr)) < num_bufs) {
+            PLOG(ERROR) << "aio: got error waiting " << (read ? "read" : "write");
+            return -1;
+        }
+        if (num_bufs == 1 && aiob->events[0].res == -EINTR) {
+            continue;
+        }
+        for (int i = 0; i < num_bufs; i++) {
+            if (aiob->events[i].res < 0) {
+                errno = -aiob->events[i].res;
+                PLOG(ERROR) << "aio: got error event on " << (read ? "read" : "write")
+                            << " total bufs " << num_bufs;
+                return -1;
+            }
+        }
+        return 0;
     }
-    return 0;
 }
 
 static int usb_ffs_aio_read(usb_handle* h, void* data, int len) {
@@ -494,8 +497,6 @@
     h->kicked = false;
     adb_close(h->bulk_out);
     adb_close(h->bulk_in);
-    io_destroy(h->read_aiob.ctx);
-    io_destroy(h->write_aiob.ctx);
 
     // Notify usb_adb_open_thread to open a new connection.
     h->lock.lock();
diff --git a/adb/sockets.cpp b/adb/sockets.cpp
index 4f4fbfb..9a6dcbe 100644
--- a/adb/sockets.cpp
+++ b/adb/sockets.cpp
@@ -750,7 +750,7 @@
     if (!s->transport) {
         SendFail(s->peer->fd, "device offline (no transport)");
         goto fail;
-    } else if (s->transport->GetConnectionState() == kCsOffline) {
+    } else if (!ConnectionStateIsOnline(s->transport->GetConnectionState())) {
         /* if there's no remote we fail the connection
          ** right here and terminate it
          */
diff --git a/adb/test_adb.py b/adb/test_adb.py
index 32bf029..ddd3ff0 100644
--- a/adb/test_adb.py
+++ b/adb/test_adb.py
@@ -36,10 +36,11 @@
 
 
 @contextlib.contextmanager
-def fake_adb_server(protocol=socket.AF_INET, port=0):
-    """Creates a fake ADB server that just replies with a CNXN packet."""
+def fake_adbd(protocol=socket.AF_INET, port=0):
+    """Creates a fake ADB daemon that just replies with a CNXN packet."""
 
     serversock = socket.socket(protocol, socket.SOCK_STREAM)
+    serversock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
     if protocol == socket.AF_INET:
         serversock.bind(('127.0.0.1', port))
     else:
@@ -60,31 +61,33 @@
         rlist = [readpipe, serversock]
         cnxn_sent = {}
         while True:
-            ready, _, _ = select.select(rlist, [], [])
-            for r in ready:
-                if r == readpipe:
+            read_ready, _, _ = select.select(rlist, [], [])
+            for ready in read_ready:
+                if ready == readpipe:
                     # Closure pipe
-                    os.close(r)
+                    os.close(ready)
                     serversock.shutdown(socket.SHUT_RDWR)
                     serversock.close()
                     return
-                elif r == serversock:
+                elif ready == serversock:
                     # Server socket
-                    conn, _ = r.accept()
+                    conn, _ = ready.accept()
                     rlist.append(conn)
                 else:
                     # Client socket
-                    data = r.recv(1024)
-                    if not data:
-                        if r in cnxn_sent:
-                            del cnxn_sent[r]
-                        rlist.remove(r)
+                    data = ready.recv(1024)
+                    if not data or data.startswith('OPEN'):
+                        if ready in cnxn_sent:
+                            del cnxn_sent[ready]
+                        ready.shutdown(socket.SHUT_RDWR)
+                        ready.close()
+                        rlist.remove(ready)
                         continue
-                    if r in cnxn_sent:
+                    if ready in cnxn_sent:
                         continue
-                    cnxn_sent[r] = True
-                    r.sendall(_adb_packet('CNXN', 0x01000001, 1024 * 1024,
-                                          'device::ro.product.name=fakeadb'))
+                    cnxn_sent[ready] = True
+                    ready.sendall(_adb_packet('CNXN', 0x01000001, 1024 * 1024,
+                                              'device::ro.product.name=fakeadb'))
 
     port = serversock.getsockname()[1]
     server_thread = threading.Thread(target=_handle)
@@ -97,8 +100,52 @@
         server_thread.join()
 
 
-class NonApiTest(unittest.TestCase):
-    """Tests for ADB that aren't a part of the AndroidDevice API."""
+@contextlib.contextmanager
+def adb_connect(unittest, serial):
+    """Context manager for an ADB connection.
+
+    This automatically disconnects when done with the connection.
+    """
+
+    output = subprocess.check_output(['adb', 'connect', serial])
+    unittest.assertEqual(output.strip(), 'connected to {}'.format(serial))
+
+    try:
+        yield
+    finally:
+        # Perform best-effort disconnection. Discard the output.
+        subprocess.Popen(['adb', 'disconnect', serial],
+                         stdout=subprocess.PIPE,
+                         stderr=subprocess.PIPE).communicate()
+
+
+@contextlib.contextmanager
+def adb_server():
+    """Context manager for an ADB server.
+
+    This creates an ADB server and returns the port it's listening on.
+    """
+
+    port = 5038
+    # Kill any existing server on this non-default port.
+    subprocess.check_output(['adb', '-P', str(port), 'kill-server'],
+                            stderr=subprocess.STDOUT)
+    read_pipe, write_pipe = os.pipe()
+    proc = subprocess.Popen(['adb', '-L', 'tcp:localhost:{}'.format(port),
+                             'fork-server', 'server',
+                             '--reply-fd', str(write_pipe)])
+    try:
+        os.close(write_pipe)
+        greeting = os.read(read_pipe, 1024)
+        assert greeting == 'OK\n', repr(greeting)
+        yield port
+    finally:
+        proc.terminate()
+        proc.wait()
+
+
+class CommandlineTest(unittest.TestCase):
+    """Tests for the ADB commandline."""
 
     def test_help(self):
         """Make sure we get _something_ out of help."""
@@ -120,28 +167,37 @@
                 revision_line, r'^Revision [0-9a-f]{12}-android$')
 
     def test_tcpip_error_messages(self):
-        p = subprocess.Popen(['adb', 'tcpip'], stdout=subprocess.PIPE,
-                             stderr=subprocess.STDOUT)
-        out, _ = p.communicate()
-        self.assertEqual(1, p.returncode)
+        """Make sure 'adb tcpip' parsing is sane."""
+        proc = subprocess.Popen(['adb', 'tcpip'], stdout=subprocess.PIPE,
+                                stderr=subprocess.STDOUT)
+        out, _ = proc.communicate()
+        self.assertEqual(1, proc.returncode)
         self.assertIn('requires an argument', out)
 
-        p = subprocess.Popen(['adb', 'tcpip', 'foo'], stdout=subprocess.PIPE,
-                             stderr=subprocess.STDOUT)
-        out, _ = p.communicate()
-        self.assertEqual(1, p.returncode)
+        proc = subprocess.Popen(['adb', 'tcpip', 'foo'], stdout=subprocess.PIPE,
+                                stderr=subprocess.STDOUT)
+        out, _ = proc.communicate()
+        self.assertEqual(1, proc.returncode)
         self.assertIn('invalid port', out)
 
-    # Helper method that reads a pipe until it is closed, then sets the event.
-    def _read_pipe_and_set_event(self, pipe, event):
-        x = pipe.read()
+
+class ServerTest(unittest.TestCase):
+    """Tests for the ADB server."""
+
+    @staticmethod
+    def _read_pipe_and_set_event(pipe, event):
+        """Reads a pipe until it is closed, then sets the event."""
+        pipe.read()
         event.set()
 
-    # Test that launch_server() does not let the adb server inherit
-    # stdin/stdout/stderr handles which can cause callers of adb.exe to hang.
-    # This test also runs fine on unix even though the impetus is an issue
-    # unique to Windows.
     def test_handle_inheritance(self):
+        """Test that launch_server() does not inherit handles.
+
+        launch_server() should not let the adb server inherit
+        stdin/stdout/stderr handles, which can cause callers of adb.exe to hang.
+        This test also runs fine on unix even though the impetus is an issue
+        unique to Windows.
+        """
         # This test takes 5 seconds to run on Windows: if there is no adb server
         # running on the the port used below, adb kill-server tries to make a
         # TCP connection to a closed port and that takes 1 second on Windows;
@@ -163,29 +219,30 @@
 
         try:
             # Run the adb client and have it start the adb server.
-            p = subprocess.Popen(['adb', '-P', str(port), 'start-server'],
-                                 stdin=subprocess.PIPE, stdout=subprocess.PIPE,
-                                 stderr=subprocess.PIPE)
+            proc = subprocess.Popen(['adb', '-P', str(port), 'start-server'],
+                                    stdin=subprocess.PIPE,
+                                    stdout=subprocess.PIPE,
+                                    stderr=subprocess.PIPE)
 
             # Start threads that set events when stdout/stderr are closed.
             stdout_event = threading.Event()
             stdout_thread = threading.Thread(
-                    target=self._read_pipe_and_set_event,
-                    args=(p.stdout, stdout_event))
+                target=ServerTest._read_pipe_and_set_event,
+                args=(proc.stdout, stdout_event))
             stdout_thread.daemon = True
             stdout_thread.start()
 
             stderr_event = threading.Event()
             stderr_thread = threading.Thread(
-                    target=self._read_pipe_and_set_event,
-                    args=(p.stderr, stderr_event))
+                target=ServerTest._read_pipe_and_set_event,
+                args=(proc.stderr, stderr_event))
             stderr_thread.daemon = True
             stderr_thread.start()
 
             # Wait for the adb client to finish. Once that has occurred, if
             # stdin/stderr/stdout are still open, it must be open in the adb
             # server.
-            p.wait()
+            proc.wait()
 
             # Try to write to stdin which we expect is closed. If it isn't
             # closed, we should get an IOError. If we don't get an IOError,
@@ -193,7 +250,7 @@
             # probably letting the adb server inherit stdin which would be
             # wrong.
             with self.assertRaises(IOError):
-                p.stdin.write('x')
+                proc.stdin.write('x')
 
             # Wait a few seconds for stdout/stderr to be closed (in the success
             # case, this won't wait at all). If there is a timeout, that means
@@ -207,8 +264,12 @@
             subprocess.check_output(['adb', '-P', str(port), 'kill-server'],
                                     stderr=subprocess.STDOUT)
 
-    # Use SO_LINGER to cause TCP RST segment to be sent on socket close.
+
+class EmulatorTest(unittest.TestCase):
+    """Tests for the emulator connection."""
+
     def _reset_socket_on_close(self, sock):
+        """Use SO_LINGER to cause TCP RST segment to be sent on socket close."""
         # The linger structure is two shorts on Windows, but two ints on Unix.
         linger_format = 'hh' if os.name == 'nt' else 'ii'
         l_onoff = 1
@@ -227,7 +288,7 @@
         Bug: https://code.google.com/p/android/issues/detail?id=21021
         """
         with contextlib.closing(
-                socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as listener:
+            socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as listener:
             # Use SO_REUSEADDR so subsequent runs of the test can grab the port
             # even if it is in TIME_WAIT.
             listener.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
@@ -237,7 +298,7 @@
 
             # Now that listening has started, start adb emu kill, telling it to
             # connect to our mock emulator.
-            p = subprocess.Popen(
+            proc = subprocess.Popen(
                 ['adb', '-s', 'emulator-' + str(port), 'emu', 'kill'],
                 stderr=subprocess.STDOUT)
 
@@ -246,12 +307,16 @@
                 # If WSAECONNABORTED (10053) is raised by any socket calls,
                 # then adb probably isn't reading the data that we sent it.
                 conn.sendall('Android Console: type \'help\' for a list ' +
-                                'of commands\r\n')
+                             'of commands\r\n')
                 conn.sendall('OK\r\n')
 
-                with contextlib.closing(conn.makefile()) as f:
-                    self.assertEqual('kill\n', f.readline())
-                    self.assertEqual('quit\n', f.readline())
+                with contextlib.closing(conn.makefile()) as connf:
+                    line = connf.readline()
+                    if line.startswith('auth'):
+                        # Ignore the first auth line.
+                        line = connf.readline()
+                    self.assertEqual('kill\n', line)
+                    self.assertEqual('quit\n', connf.readline())
 
                 conn.sendall('OK: killing emulator, bye bye\r\n')
 
@@ -264,11 +329,48 @@
                 self._reset_socket_on_close(conn)
 
             # Wait for adb to finish, so we can check return code.
-            p.communicate()
+            proc.communicate()
 
             # If this fails, adb probably isn't ignoring WSAECONNRESET when
             # reading the response from the adb emu kill command (on Windows).
-            self.assertEqual(0, p.returncode)
+            self.assertEqual(0, proc.returncode)
+
+    def test_emulator_connect(self):
+        """Ensure that the emulator can connect.
+
+        Bug: http://b/78991667
+        """
+        with adb_server() as server_port:
+            with fake_adbd() as port:
+                serial = 'emulator-{}'.format(port - 1)
+                # Ensure that the emulator is not there.
+                try:
+                    subprocess.check_output(['adb', '-P', str(server_port),
+                                             '-s', serial, 'get-state'],
+                                            stderr=subprocess.STDOUT)
+                    self.fail('Device should not be available')
+                except subprocess.CalledProcessError as err:
+                    self.assertEqual(
+                        err.output.strip(),
+                        'error: device \'{}\' not found'.format(serial))
+
+                # Let the ADB server know that the emulator has started.
+                with contextlib.closing(
+                    socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
+                    sock.connect(('localhost', server_port))
+                    command = 'host:emulator:{}'.format(port)
+                    sock.sendall('%04x%s' % (len(command), command))
+
+                # Ensure the emulator is there.
+                subprocess.check_call(['adb', '-P', str(server_port),
+                                       '-s', serial, 'wait-for-device'])
+                output = subprocess.check_output(['adb', '-P', str(server_port),
+                                                  '-s', serial, 'get-state'])
+                self.assertEqual(output.strip(), 'device')
+
+
+class ConnectionTest(unittest.TestCase):
+    """Tests for adb connect."""
 
     def test_connect_ipv4_ipv6(self):
         """Ensure that `adb connect localhost:1234` will try both IPv4 and IPv6.
@@ -277,38 +379,67 @@
         """
         for protocol in (socket.AF_INET, socket.AF_INET6):
             try:
-                with fake_adb_server(protocol=protocol) as port:
-                    output = subprocess.check_output(
-                        ['adb', 'connect', 'localhost:{}'.format(port)])
-
-                    self.assertEqual(
-                        output.strip(), 'connected to localhost:{}'.format(port))
+                with fake_adbd(protocol=protocol) as port:
+                    serial = 'localhost:{}'.format(port)
+                    with adb_connect(self, serial):
+                        pass
             except socket.error:
                 print("IPv6 not available, skipping")
                 continue
 
     def test_already_connected(self):
-        with fake_adb_server() as port:
-            output = subprocess.check_output(
-                ['adb', 'connect', 'localhost:{}'.format(port)])
+        """Ensure that an already-connected device stays connected."""
 
-            self.assertEqual(
-                output.strip(), 'connected to localhost:{}'.format(port))
+        with fake_adbd() as port:
+            serial = 'localhost:{}'.format(port)
+            with adb_connect(self, serial):
+                # b/31250450: this always returns 0 but probably shouldn't.
+                output = subprocess.check_output(['adb', 'connect', serial])
+                self.assertEqual(
+                    output.strip(), 'already connected to {}'.format(serial))
 
-            # b/31250450: this always returns 0 but probably shouldn't.
-            output = subprocess.check_output(
-                ['adb', 'connect', 'localhost:{}'.format(port)])
+    def test_reconnect(self):
+        """Ensure that a disconnected device reconnects."""
 
-            self.assertEqual(
-                output.strip(), 'already connected to localhost:{}'.format(port))
+        with fake_adbd() as port:
+            serial = 'localhost:{}'.format(port)
+            with adb_connect(self, serial):
+                output = subprocess.check_output(['adb', '-s', serial,
+                                                  'get-state'])
+                self.assertEqual(output.strip(), 'device')
+
+                # This will fail.
+                proc = subprocess.Popen(['adb', '-s', serial, 'shell', 'true'],
+                                        stdout=subprocess.PIPE,
+                                        stderr=subprocess.STDOUT)
+                output, _ = proc.communicate()
+                self.assertEqual(output.strip(), 'error: closed')
+
+                subprocess.check_call(['adb', '-s', serial, 'wait-for-device'])
+
+                output = subprocess.check_output(['adb', '-s', serial,
+                                                  'get-state'])
+                self.assertEqual(output.strip(), 'device')
+
+                # Once we explicitly kick a device, it won't attempt to
+                # reconnect.
+                output = subprocess.check_output(['adb', 'disconnect', serial])
+                self.assertEqual(
+                    output.strip(), 'disconnected {}'.format(serial))
+                try:
+                    subprocess.check_output(['adb', '-s', serial, 'get-state'],
+                                            stderr=subprocess.STDOUT)
+                    self.fail('Device should not be available')
+                except subprocess.CalledProcessError as err:
+                    self.assertEqual(
+                        err.output.strip(),
+                        'error: device \'{}\' not found'.format(serial))
+
 
 def main():
+    """Main entrypoint."""
     random.seed(0)
-    if len(adb.get_devices()) > 0:
-        suite = unittest.TestLoader().loadTestsFromName(__name__)
-        unittest.TextTestRunner(verbosity=3).run(suite)
-    else:
-        print('Test suite must be run with attached devices')
+    unittest.main(verbosity=3)
 
 
 if __name__ == '__main__':
diff --git a/adb/transport.cpp b/adb/transport.cpp
index 4c9c90c..7db9bf2 100644
--- a/adb/transport.cpp
+++ b/adb/transport.cpp
@@ -33,6 +33,7 @@
 #include <deque>
 #include <list>
 #include <mutex>
+#include <queue>
 #include <thread>
 
 #include <android-base/logging.h>
@@ -50,7 +51,9 @@
 #include "adb_utils.h"
 #include "fdevent.h"
 
-static void transport_unref(atransport *t);
+static void register_transport(atransport* transport);
+static void remove_transport(atransport* transport);
+static void transport_unref(atransport* transport);
 
 // TODO: unordered_map<TransportId, atransport*>
 static auto& transport_list = *new std::list<atransport*>();
@@ -77,6 +80,130 @@
     ~ScopedAssumeLocked() RELEASE() {}
 };
 
+// Tracks and handles atransport*s that are attempting reconnection.
+class ReconnectHandler {
+  public:
+    ReconnectHandler() = default;
+    ~ReconnectHandler() = default;
+
+    // Starts the ReconnectHandler thread.
+    void Start();
+
+    // Requests the ReconnectHandler thread to stop.
+    void Stop();
+
+    // Adds the atransport* to the queue of reconnect attempts.
+    void TrackTransport(atransport* transport);
+
+  private:
+    // The main thread loop.
+    void Run();
+
+    // Tracks a reconnection attempt.
+    struct ReconnectAttempt {
+        atransport* transport;
+        std::chrono::system_clock::time_point deadline;
+        size_t attempts_left;
+    };
+
+    // Only retry for up to one minute.
+    static constexpr const std::chrono::seconds kDefaultTimeout = std::chrono::seconds(10);
+    static constexpr const size_t kMaxAttempts = 6;
+
+    // Protects all members.
+    std::mutex reconnect_mutex_;
+    bool running_ GUARDED_BY(reconnect_mutex_) = true;
+    std::thread handler_thread_;
+    std::condition_variable reconnect_cv_;
+    std::queue<ReconnectAttempt> reconnect_queue_ GUARDED_BY(reconnect_mutex_);
+
+    DISALLOW_COPY_AND_ASSIGN(ReconnectHandler);
+};
+
+void ReconnectHandler::Start() {
+    check_main_thread();
+    handler_thread_ = std::thread(&ReconnectHandler::Run, this);
+}
+
+void ReconnectHandler::Stop() {
+    check_main_thread();
+    {
+        std::lock_guard<std::mutex> lock(reconnect_mutex_);
+        running_ = false;
+    }
+    reconnect_cv_.notify_one();
+    handler_thread_.join();
+
+    // Drain the queue to free all resources.
+    std::lock_guard<std::mutex> lock(reconnect_mutex_);
+    while (!reconnect_queue_.empty()) {
+        ReconnectAttempt attempt = reconnect_queue_.front();
+        reconnect_queue_.pop();
+        remove_transport(attempt.transport);
+    }
+}
+
+void ReconnectHandler::TrackTransport(atransport* transport) {
+    check_main_thread();
+    {
+        std::lock_guard<std::mutex> lock(reconnect_mutex_);
+        if (!running_) return;
+        reconnect_queue_.emplace(ReconnectAttempt{
+            transport, std::chrono::system_clock::now() + ReconnectHandler::kDefaultTimeout,
+            ReconnectHandler::kMaxAttempts});
+    }
+    reconnect_cv_.notify_one();
+}
+
+void ReconnectHandler::Run() {
+    while (true) {
+        ReconnectAttempt attempt;
+        {
+            std::unique_lock<std::mutex> lock(reconnect_mutex_);
+            ScopedAssumeLocked assume_lock(reconnect_mutex_);
+
+            auto deadline = std::chrono::time_point<std::chrono::system_clock>::max();
+            if (!reconnect_queue_.empty()) deadline = reconnect_queue_.front().deadline;
+            reconnect_cv_.wait_until(lock, deadline, [&]() REQUIRES(reconnect_mutex_) {
+                return !running_ ||
+                       (!reconnect_queue_.empty() && reconnect_queue_.front().deadline < deadline);
+            });
+
+            if (!running_) return;
+            attempt = reconnect_queue_.front();
+            reconnect_queue_.pop();
+            if (attempt.transport->kicked()) {
+                D("transport %s was kicked. giving up on it.", attempt.transport->serial);
+                remove_transport(attempt.transport);
+                continue;
+            }
+        }
+        D("attempting to reconnect %s", attempt.transport->serial);
+
+        if (!attempt.transport->Reconnect()) {
+            D("attempting to reconnect %s failed.", attempt.transport->serial);
+            if (attempt.attempts_left == 0) {
+                D("transport %s exceeded the number of retry attempts. giving up on it.",
+                  attempt.transport->serial);
+                remove_transport(attempt.transport);
+                continue;
+            }
+
+            std::lock_guard<std::mutex> lock(reconnect_mutex_);
+            reconnect_queue_.emplace(ReconnectAttempt{
+                attempt.transport,
+                std::chrono::system_clock::now() + ReconnectHandler::kDefaultTimeout,
+                attempt.attempts_left - 1});
+            continue;
+        }
+
+        D("reconnection to %s succeeded.", attempt.transport->serial);
+        register_transport(attempt.transport);
+    }
+}
+
+static auto& reconnect_handler = *new ReconnectHandler();
+
 }  // namespace
 
 TransportId NextTransportId() {
@@ -477,8 +604,6 @@
     return 0;
 }
 
-static void remove_transport(atransport*);
-
 static void transport_registration_func(int _fd, unsigned ev, void*) {
     tmsg m;
     atransport* t;
@@ -515,8 +640,9 @@
 
     /* don't create transport threads for inaccessible devices */
     if (t->GetConnectionState() != kCsNoPerm) {
-        /* initial references are the two threads */
-        t->ref_count = 1;
+        // The connection gets a reference to the atransport. It will release it
+        // upon a read/write error.
+        t->ref_count++;
         t->connection()->SetTransportName(t->serial_name());
         t->connection()->SetReadCallback([t](Connection*, std::unique_ptr<apacket> p) {
             if (!check_header(p.get(), t)) {
@@ -547,13 +673,20 @@
 
     {
         std::lock_guard<std::recursive_mutex> lock(transport_lock);
-        pending_list.remove(t);
-        transport_list.push_front(t);
+        auto it = std::find(pending_list.begin(), pending_list.end(), t);
+        if (it != pending_list.end()) {
+            pending_list.remove(t);
+            transport_list.push_front(t);
+        }
     }
 
     update_transports();
 }
 
+void init_reconnect_handler(void) {
+    reconnect_handler.Start();
+}
+
 void init_transport_registration(void) {
     int s[2];
 
@@ -571,6 +704,7 @@
 }
 
 void kick_all_transports() {
+    reconnect_handler.Stop();
     // To avoid only writing part of a packet to a transport after exit, kick all transports.
     std::lock_guard<std::recursive_mutex> lock(transport_lock);
     for (auto t : transport_list) {
@@ -600,15 +734,21 @@
 }
 
 static void transport_unref(atransport* t) {
+    check_main_thread();
     CHECK(t != nullptr);
 
     std::lock_guard<std::recursive_mutex> lock(transport_lock);
     CHECK_GT(t->ref_count, 0u);
     t->ref_count--;
     if (t->ref_count == 0) {
-        D("transport: %s unref (kicking and closing)", t->serial);
         t->connection()->Stop();
-        remove_transport(t);
+        if (t->IsTcpDevice() && !t->kicked()) {
+            D("transport: %s unref (attempting reconnection) %d", t->serial, t->kicked());
+            reconnect_handler.TrackTransport(t);
+        } else {
+            D("transport: %s unref (kicking and closing)", t->serial);
+            remove_transport(t);
+        }
     } else {
         D("transport: %s unref (count=%zu)", t->serial, t->ref_count);
     }
@@ -707,22 +847,41 @@
     }
     lock.unlock();
 
-    // Don't return unauthorized devices; the caller can't do anything with them.
-    if (result && result->GetConnectionState() == kCsUnauthorized && !accept_any_state) {
-        *error_out = "device unauthorized.\n";
-        char* ADB_VENDOR_KEYS = getenv("ADB_VENDOR_KEYS");
-        *error_out += "This adb server's $ADB_VENDOR_KEYS is ";
-        *error_out += ADB_VENDOR_KEYS ? ADB_VENDOR_KEYS : "not set";
-        *error_out += "\n";
-        *error_out += "Try 'adb kill-server' if that seems wrong.\n";
-        *error_out += "Otherwise check for a confirmation dialog on your device.";
-        result = nullptr;
-    }
+    if (result && !accept_any_state) {
+        // The caller requires an active transport.
+        // Make sure that we're actually connected.
+        ConnectionState state = result->GetConnectionState();
+        switch (state) {
+            case kCsConnecting:
+                *error_out = "device still connecting";
+                result = nullptr;
+                break;
 
-    // Don't return offline devices; the caller can't do anything with them.
-    if (result && result->GetConnectionState() == kCsOffline && !accept_any_state) {
-        *error_out = "device offline";
-        result = nullptr;
+            case kCsAuthorizing:
+                *error_out = "device still authorizing";
+                result = nullptr;
+                break;
+
+            case kCsUnauthorized: {
+                *error_out = "device unauthorized.\n";
+                char* ADB_VENDOR_KEYS = getenv("ADB_VENDOR_KEYS");
+                *error_out += "This adb server's $ADB_VENDOR_KEYS is ";
+                *error_out += ADB_VENDOR_KEYS ? ADB_VENDOR_KEYS : "not set";
+                *error_out += "\n";
+                *error_out += "Try 'adb kill-server' if that seems wrong.\n";
+                *error_out += "Otherwise check for a confirmation dialog on your device.";
+                result = nullptr;
+                break;
+            }
+
+            case kCsOffline:
+                *error_out = "device offline";
+                result = nullptr;
+                break;
+
+            default:
+                break;
+        }
     }
 
     if (result) {
@@ -761,9 +920,8 @@
 }
 
 void atransport::Kick() {
-    if (!kicked_) {
-        D("kicking transport %s", this->serial);
-        kicked_ = true;
+    if (!kicked_.exchange(true)) {
+        D("kicking transport %p %s", this, this->serial);
         this->connection()->Stop();
     }
 }
@@ -801,6 +959,10 @@
             return "sideload";
         case kCsUnauthorized:
             return "unauthorized";
+        case kCsAuthorizing:
+            return "authorizing";
+        case kCsConnecting:
+            return "connecting";
         default:
             return "unknown";
     }
@@ -917,6 +1079,10 @@
     connection_waitable_->SetConnectionEstablished(success);
 }
 
+bool atransport::Reconnect() {
+    return reconnect_(this);
+}
+
 #if ADB_HOST
 
 // We use newline as our delimiter, make sure to never output it.
@@ -997,8 +1163,9 @@
 }
 #endif  // ADB_HOST
 
-int register_socket_transport(int s, const char* serial, int port, int local) {
-    atransport* t = new atransport();
+int register_socket_transport(int s, const char* serial, int port, int local,
+                              atransport::ReconnectCallback reconnect) {
+    atransport* t = new atransport(std::move(reconnect), kCsOffline);
 
     if (!serial) {
         char buf[32];
@@ -1079,7 +1246,7 @@
 
 void register_usb_transport(usb_handle* usb, const char* serial, const char* devpath,
                             unsigned writeable) {
-    atransport* t = new atransport((writeable ? kCsOffline : kCsNoPerm));
+    atransport* t = new atransport(writeable ? kCsOffline : kCsNoPerm);
 
     D("transport: %p init'ing for usb_handle %p (sn='%s')", t, usb, serial ? serial : "");
     init_usb_transport(t, usb);
diff --git a/adb/transport.h b/adb/transport.h
index ebc186b..ae9cc02 100644
--- a/adb/transport.h
+++ b/adb/transport.h
@@ -198,20 +198,27 @@
     // class in one go is a very large change. Given how bad our testing is,
     // it's better to do this piece by piece.
 
-    atransport(ConnectionState state = kCsOffline)
+    using ReconnectCallback = std::function<bool(atransport*)>;
+
+    atransport(ReconnectCallback reconnect, ConnectionState state)
         : id(NextTransportId()),
+          kicked_(false),
           connection_state_(state),
           connection_waitable_(std::make_shared<ConnectionWaitable>()),
-          connection_(nullptr) {
+          connection_(nullptr),
+          reconnect_(std::move(reconnect)) {
         // Initialize protocol to min version for compatibility with older versions.
         // Version will be updated post-connect.
         protocol_version = A_VERSION_MIN;
         max_payload = MAX_PAYLOAD;
     }
+    atransport(ConnectionState state = kCsOffline)
+        : atransport([](atransport*) { return false; }, state) {}
     virtual ~atransport();
 
     int Write(apacket* p);
     void Kick();
+    bool kicked() const { return kicked_; }
 
     // ConnectionState can be read by all threads, but can only be written in the main thread.
     ConnectionState GetConnectionState() const;
@@ -286,8 +293,12 @@
     // Gets a shared reference to the ConnectionWaitable.
     std::shared_ptr<ConnectionWaitable> connection_waitable() { return connection_waitable_; }
 
+    // Attempts to reconnect with the underlying Connection. Returns true if the
+    // reconnection attempt succeeded.
+    bool Reconnect();
+
   private:
-    bool kicked_ = false;
+    std::atomic<bool> kicked_;
 
     // A set of features transmitted in the banner with the initial connection.
     // This is stored in the banner as 'features=feature0,feature1,etc'.
@@ -310,6 +321,9 @@
     // The underlying connection object.
     std::shared_ptr<Connection> connection_ GUARDED_BY(mutex_);
 
+    // A callback that will be invoked when the atransport needs to reconnect.
+    ReconnectCallback reconnect_;
+
     std::mutex mutex_;
 
     DISALLOW_COPY_AND_ASSIGN(atransport);
@@ -333,6 +347,7 @@
 // Stops iteration and returns false if fn returns false, otherwise returns true.
 bool iterate_transports(std::function<bool(const atransport*)> fn);
 
+void init_reconnect_handler(void);
 void init_transport_registration(void);
 void init_mdns_transport_discovery(void);
 std::string list_transports(bool long_listing);
@@ -347,7 +362,8 @@
 void connect_device(const std::string& address, std::string* response);
 
 /* cause new transports to be init'd and added to the list */
-int register_socket_transport(int s, const char* serial, int port, int local);
+int register_socket_transport(int s, const char* serial, int port, int local,
+                              atransport::ReconnectCallback reconnect);
 
 // This should only be used for transports with connection_state == kCsNoPerm.
 void unregister_usb_transport(usb_handle* usb);
diff --git a/adb/transport_local.cpp b/adb/transport_local.cpp
index e81f27c..181d666 100644
--- a/adb/transport_local.cpp
+++ b/adb/transport_local.cpp
@@ -68,28 +68,24 @@
     return local_connect_arbitrary_ports(port - 1, port, &dummy) == 0;
 }
 
-void connect_device(const std::string& address, std::string* response) {
-    if (address.empty()) {
-        *response = "empty address";
-        return;
-    }
-
+std::tuple<unique_fd, int, std::string> tcp_connect(const std::string& address,
+                                                    std::string* response) {
     std::string serial;
     std::string host;
     int port = DEFAULT_ADB_LOCAL_TRANSPORT_PORT;
     if (!android::base::ParseNetAddress(address, &host, &port, &serial, response)) {
-        return;
+        return std::make_tuple(unique_fd(), port, serial);
     }
 
     std::string error;
-    int fd = network_connect(host.c_str(), port, SOCK_STREAM, 10, &error);
+    unique_fd fd(network_connect(host.c_str(), port, SOCK_STREAM, 10, &error));
     if (fd == -1) {
         *response = android::base::StringPrintf("unable to connect to %s: %s",
                                                 serial.c_str(), error.c_str());
-        return;
+        return std::make_tuple(std::move(fd), port, serial);
     }
 
-    D("client: connected %s remote on fd %d", serial.c_str(), fd);
+    D("client: connected %s remote on fd %d", serial.c_str(), fd.get());
     close_on_exec(fd);
     disable_tcp_nagle(fd);
 
@@ -98,7 +94,38 @@
         D("warning: failed to configure TCP keepalives (%s)", strerror(errno));
     }
 
-    int ret = register_socket_transport(fd, serial.c_str(), port, 0);
+    return std::make_tuple(std::move(fd), port, serial);
+}
+
+void connect_device(const std::string& address, std::string* response) {
+    if (address.empty()) {
+        *response = "empty address";
+        return;
+    }
+
+    unique_fd fd;
+    int port;
+    std::string serial;
+    std::tie(fd, port, serial) = tcp_connect(address, response);
+    auto reconnect = [address](atransport* t) {
+        std::string response;
+        unique_fd fd;
+        int port;
+        std::string serial;
+        std::tie(fd, port, serial) = tcp_connect(address, &response);
+        if (fd == -1) {
+            D("reconnect failed: %s", response.c_str());
+            return false;
+        }
+
+        // This invokes the part of register_socket_transport() that needs to be
+        // invoked if the atransport* has already been setup. This eventually
+        // calls atransport->SetConnection() with a newly created Connection*
+        // that will in turn send the CNXN packet.
+        return init_socket_transport(t, fd.release(), port, 0) >= 0;
+    };
+
+    int ret = register_socket_transport(fd.release(), serial.c_str(), port, 0, std::move(reconnect));
     if (ret < 0) {
         adb_close(fd);
         if (ret == -EALREADY) {
@@ -135,7 +162,8 @@
         close_on_exec(fd);
         disable_tcp_nagle(fd);
         std::string serial = getEmulatorSerialString(console_port);
-        if (register_socket_transport(fd, serial.c_str(), adb_port, 1) == 0) {
+        if (register_socket_transport(fd, serial.c_str(), adb_port, 1,
+                                      [](atransport*) { return false; }) == 0) {
             return 0;
         }
         adb_close(fd);
@@ -239,7 +267,8 @@
             close_on_exec(fd);
             disable_tcp_nagle(fd);
             std::string serial = android::base::StringPrintf("host-%d", fd);
-            if (register_socket_transport(fd, serial.c_str(), port, 1) != 0) {
+            if (register_socket_transport(fd, serial.c_str(), port, 1,
+                                          [](atransport*) { return false; }) != 0) {
                 adb_close(fd);
             }
         }
@@ -338,7 +367,8 @@
                 /* Host is connected. Register the transport, and start the
                  * exchange. */
                 std::string serial = android::base::StringPrintf("host-%d", fd);
-                if (register_socket_transport(fd, serial.c_str(), port, 1) != 0 ||
+                if (register_socket_transport(fd, serial.c_str(), port, 1,
+                                              [](atransport*) { return false; }) != 0 ||
                     !WriteFdExactly(fd, _start_req, strlen(_start_req))) {
                     adb_close(fd);
                 }
diff --git a/base/Android.bp b/base/Android.bp
index ec81f61..47b29c6 100644
--- a/base/Android.bp
+++ b/base/Android.bp
@@ -26,6 +26,7 @@
 cc_library_headers {
     name: "libbase_headers",
     vendor_available: true,
+    recovery_available: true,
     host_supported: true,
     export_include_dirs: ["include"],
 
diff --git a/bootstat/boot_reason_test.sh b/bootstat/boot_reason_test.sh
index b194bbe..01b8948 100755
--- a/bootstat/boot_reason_test.sh
+++ b/bootstat/boot_reason_test.sh
@@ -312,6 +312,7 @@
 init    : processing action (ro.boot.bootreason=*) from (/system/etc/init/bootstat.rc
 init    : processing action (sys.boot_completed=1 && sys.logbootcomplete=1) from (/system/etc/init/bootstat.rc
  (/system/bin/bootstat --record_boot_complete --record_boot_reason --record_time_since_factory_reset -l)'
+ (/system/bin/bootstat --set_system_boot_reason --record_boot_complete --record_boot_reason --record_time_since_factory_reset -l)'
  (/system/bin/bootstat -r post_decrypt_time_elapsed)'
 init    : Command 'exec - system log -- /system/bin/bootstat --record_boot_complete' action=sys.boot_completed=1 && sys.logbootcomplete=1 (/system/etc/init/bootstat.rc:
 init    : Command 'exec - system log -- /system/bin/bootstat --record_boot_reason' action=sys.boot_completed=1 && sys.logbootcomplete=1 (/system/etc/init/bootstat.rc:
@@ -582,9 +583,9 @@
   duration_test
   case ${TEST} in
     bootloader | recovery | cold | hard | warm ) reason=${TEST} ;;
-    *)                                           reason=reboot,${TEST} ;;
+    *)                                           reason=reboot,${TEST#optional_} ;;
   esac
-  adb reboot ${TEST}
+  adb reboot ${TEST#optional_}
   wait_for_screen
   bootloader_reason=`validate_property ro.boot.bootreason`
   EXPECT_PROPERTY ro.boot.bootreason ${bootloader_reason}
@@ -948,6 +949,20 @@
   report_bootstat_logs reboot,adb
 }
 
+[ "USAGE: test_rescueparty
+
+rescueparty test
+- adb reboot rescueparty
+- (wait until screen is up, boot has completed)
+- adb shell getprop sys.boot.reason
+- adb shell getprop ro.boot.bootreason
+- NB: should report reboot,rescueparty" ]
+test_optional_rescueparty() {
+  blind_reboot_test
+  echo "WARNING: legacy devices are allowed to fail following ro.boot.bootreason result" >&2
+  EXPECT_PROPERTY ro.boot.bootreason reboot,rescueparty
+}
+
 [ "USAGE: test_Its_Just_So_Hard_reboot
 
 Its Just So Hard reboot test:
diff --git a/debuggerd/debuggerd_test.cpp b/debuggerd/debuggerd_test.cpp
index 9b64be7..dfb7a6a 100644
--- a/debuggerd/debuggerd_test.cpp
+++ b/debuggerd/debuggerd_test.cpp
@@ -80,8 +80,13 @@
     return value;                                                  \
   }()
 
+// Backtrace frame dump could contain:
+//   #01 pc 0001cded  /data/tmp/debuggerd_test32 (raise_debugger_signal+80)
+// or
+//   #01 pc 00022a09  /data/tmp/debuggerd_test32 (offset 0x12000) (raise_debugger_signal+80)
 #define ASSERT_BACKTRACE_FRAME(result, frame_name) \
-  ASSERT_MATCH(result, R"(#\d\d pc [0-9a-f]+\s+ \S+ \()" frame_name R"(\+)");
+  ASSERT_MATCH(result,                             \
+               R"(#\d\d pc [0-9a-f]+\s+ \S+ (\(offset 0x[0-9a-f]+\) )?\()" frame_name R"(\+)");
 
 static void tombstoned_intercept(pid_t target_pid, unique_fd* intercept_fd, unique_fd* output_fd,
                                  InterceptStatus* status, DebuggerdDumpType intercept_type) {
diff --git a/debuggerd/handler/debuggerd_fallback.cpp b/debuggerd/handler/debuggerd_fallback.cpp
index dea2e17..079a574 100644
--- a/debuggerd/handler/debuggerd_fallback.cpp
+++ b/debuggerd/handler/debuggerd_fallback.cpp
@@ -304,7 +304,16 @@
 
   crash_mutex.lock();
   if (lock_count++ > 0) {
-    async_safe_format_log(ANDROID_LOG_ERROR, "libc", "recursed signal handler call, exiting");
+    async_safe_format_log(ANDROID_LOG_ERROR, "libc", "recursed signal handler call, aborting");
+    signal(SIGABRT, SIG_DFL);
+    raise(SIGABRT);
+    sigset_t sigset;
+    sigemptyset(&sigset);
+    sigaddset(&sigset, SIGABRT);
+    sigprocmask(SIG_UNBLOCK, &sigset, nullptr);
+
+    // Just in case...
+    async_safe_format_log(ANDROID_LOG_ERROR, "libc", "abort didn't exit, exiting");
     _exit(1);
   }
 
diff --git a/fastboot/Android.mk b/fastboot/Android.mk
index 9bd0628..983e195 100644
--- a/fastboot/Android.mk
+++ b/fastboot/Android.mk
@@ -101,14 +101,13 @@
 #
 
 my_dist_files := $(HOST_OUT_EXECUTABLES)/fastboot
-my_dist_files += $(HOST_OUT_EXECUTABLES)/mke2fs$(HOST_EXECUTABLE_SUFFIX)
-my_dist_files += $(HOST_OUT_EXECUTABLES)/e2fsdroid$(HOST_EXECUTABLE_SUFFIX)
-my_dist_files += $(HOST_OUT_EXECUTABLES)/make_f2fs$(HOST_EXECUTABLE_SUFFIX)
-my_dist_files += $(HOST_OUT_EXECUTABLES)/sload_f2fs$(HOST_EXECUTABLE_SUFFIX)
+my_dist_files += $(HOST_OUT_EXECUTABLES)/mke2fs
+my_dist_files += $(HOST_OUT_EXECUTABLES)/e2fsdroid
+my_dist_files += $(HOST_OUT_EXECUTABLES)/make_f2fs
+my_dist_files += $(HOST_OUT_EXECUTABLES)/sload_f2fs
 $(call dist-for-goals,dist_files sdk win_sdk,$(my_dist_files))
 ifdef HOST_CROSS_OS
-# Archive fastboot.exe for win_sdk build.
-$(call dist-for-goals,win_sdk,$(ALL_MODULES.host_cross_fastboot.BUILT))
+$(call dist-for-goals,dist_files sdk win_sdk,$(ALL_MODULES.host_cross_fastboot.BUILT))
 endif
 my_dist_files :=
 
diff --git a/fastboot/fastboot.cpp b/fastboot/fastboot.cpp
index 9463cc9..6493262 100644
--- a/fastboot/fastboot.cpp
+++ b/fastboot/fastboot.cpp
@@ -507,7 +507,8 @@
 static std::string make_temporary_directory() {
     std::string result(make_temporary_template());
     if (mkdtemp(&result[0]) == nullptr) {
-        die("unable to create temporary directory: %s", strerror(errno));
+        die("unable to create temporary directory with template %s: %s",
+            result.c_str(), strerror(errno));
     }
     return result;
 }
@@ -516,7 +517,8 @@
     std::string path_template(make_temporary_template());
     int fd = mkstemp(&path_template[0]);
     if (fd == -1) {
-        die("failed to create temporary file for %s: %s\n", what, strerror(errno));
+        die("failed to create temporary file for %s with template %s: %s\n",
+            path_template.c_str(), what, strerror(errno));
     }
     unlink(path_template.c_str());
     return fd;
diff --git a/fs_mgr/Android.bp b/fs_mgr/Android.bp
index f23150d..05dba15 100644
--- a/fs_mgr/Android.bp
+++ b/fs_mgr/Android.bp
@@ -42,6 +42,7 @@
         "fs_mgr_verity.cpp",
         "fs_mgr_avb.cpp",
         "fs_mgr_avb_ops.cpp",
+        "fs_mgr_dm_linear.cpp",
     ],
     static_libs: [
         "libfec",
diff --git a/fs_mgr/fs_mgr.cpp b/fs_mgr/fs_mgr.cpp
index 6769fda..6e9ffba 100644
--- a/fs_mgr/fs_mgr.cpp
+++ b/fs_mgr/fs_mgr.cpp
@@ -794,6 +794,29 @@
     return true;
 }
 
+bool fs_mgr_update_logical_partition(struct fstab_rec* rec) {
+    // Logical partitions are specified with a named partition rather than a
+    // block device, so if the block device is a path, then it has already
+    // been updated.
+    if (rec->blk_device[0] == '/') {
+        return true;
+    }
+
+    android::base::unique_fd dm_fd(open("/dev/device-mapper", O_RDONLY));
+    if (dm_fd < 0) {
+        PLOG(ERROR) << "open /dev/device-mapper failed";
+        return false;
+    }
+    struct dm_ioctl io;
+    std::string device_name;
+    if (!fs_mgr_dm_get_device_name(&io, rec->blk_device, dm_fd, &device_name)) {
+        return false;
+    }
+    free(rec->blk_device);
+    rec->blk_device = strdup(device_name.c_str());
+    return true;
+}
+
 /* When multiple fstab records share the same mount_point, it will
  * try to mount each one in turn, and ignore any duplicates after a
  * first successful mount.
@@ -845,6 +868,13 @@
             }
         }
 
+        if ((fstab->recs[i].fs_mgr_flags & MF_LOGICAL)) {
+            if (!fs_mgr_update_logical_partition(&fstab->recs[i])) {
+                LERROR << "Could not set up logical partition, skipping!";
+                continue;
+            }
+        }
+
         if (fstab->recs[i].fs_mgr_flags & MF_WAIT &&
             !fs_mgr_wait_for_file(fstab->recs[i].blk_device, 20s)) {
             LERROR << "Skipping '" << fstab->recs[i].blk_device << "' during mount_all";
@@ -1065,6 +1095,13 @@
             return FS_MGR_DOMNT_FAILED;
         }
 
+        if ((fstab->recs[i].fs_mgr_flags & MF_LOGICAL)) {
+            if (!fs_mgr_update_logical_partition(&fstab->recs[i])) {
+                LERROR << "Could not set up logical partition, skipping!";
+                continue;
+            }
+        }
+
         /* First check the filesystem if requested */
         if (fstab->recs[i].fs_mgr_flags & MF_WAIT && !fs_mgr_wait_for_file(n_blk_device, 20s)) {
             LERROR << "Skipping mounting '" << n_blk_device << "'";
@@ -1383,7 +1420,7 @@
             mount_point = basename(fstab->recs[i].mount_point);
         }
 
-        fs_mgr_verity_ioctl_init(io, mount_point);
+        fs_mgr_dm_ioctl_init(io, DM_BUF_SIZE, mount_point);
 
         const char* status;
         if (ioctl(fd, DM_TABLE_STATUS, io)) {
diff --git a/fs_mgr/fs_mgr_avb.cpp b/fs_mgr/fs_mgr_avb.cpp
index 6ea3833..5a9cb65 100644
--- a/fs_mgr/fs_mgr_avb.cpp
+++ b/fs_mgr/fs_mgr_avb.cpp
@@ -303,7 +303,7 @@
 
 static bool load_verity_table(struct dm_ioctl* io, const std::string& dm_device_name, int fd,
                               uint64_t image_size, const std::string& verity_table) {
-    fs_mgr_verity_ioctl_init(io, dm_device_name);
+    fs_mgr_dm_ioctl_init(io, DM_BUF_SIZE, dm_device_name);
 
     // The buffer consists of [dm_ioctl][dm_target_spec][verity_params].
     char* buffer = (char*)io;
@@ -360,14 +360,14 @@
     alignas(dm_ioctl) char buffer[DM_BUF_SIZE];
     struct dm_ioctl* io = (struct dm_ioctl*)buffer;
     const std::string mount_point(basename(fstab_entry->mount_point));
-    if (!fs_mgr_create_verity_device(io, mount_point, fd)) {
+    if (!fs_mgr_dm_create_device(io, mount_point, fd)) {
         LERROR << "Couldn't create verity device!";
         return false;
     }
 
     // Gets the name of the device file.
     std::string verity_blk_name;
-    if (!fs_mgr_get_verity_device_name(io, mount_point, fd, &verity_blk_name)) {
+    if (!fs_mgr_dm_get_device_name(io, mount_point, fd, &verity_blk_name)) {
         LERROR << "Couldn't get verity device number!";
         return false;
     }
@@ -386,7 +386,7 @@
     }
 
     // Activates the device.
-    if (!fs_mgr_resume_verity_table(io, mount_point, fd)) {
+    if (!fs_mgr_dm_resume_table(io, mount_point, fd)) {
         return false;
     }
 
@@ -585,7 +585,13 @@
 
     // Derives partition_name from blk_device to query the corresponding AVB HASHTREE descriptor
     // to setup dm-verity. The partition_names in AVB descriptors are without A/B suffix.
-    std::string partition_name(basename(fstab_entry->blk_device));
+    std::string partition_name;
+    if (fstab_entry->fs_mgr_flags & MF_LOGICAL) {
+        partition_name = fstab_entry->logical_partition_name;
+    } else {
+        partition_name = basename(fstab_entry->blk_device);
+    }
+
     if (fstab_entry->fs_mgr_flags & MF_SLOTSELECT) {
         auto ab_suffix = partition_name.rfind(fs_mgr_get_slot_suffix());
         if (ab_suffix != std::string::npos) {
diff --git a/fs_mgr/fs_mgr_dm_ioctl.cpp b/fs_mgr/fs_mgr_dm_ioctl.cpp
index 5f9b118..3a7fae4 100644
--- a/fs_mgr/fs_mgr_dm_ioctl.cpp
+++ b/fs_mgr/fs_mgr_dm_ioctl.cpp
@@ -23,9 +23,9 @@
 #include "fs_mgr_priv.h"
 #include "fs_mgr_priv_dm_ioctl.h"
 
-void fs_mgr_verity_ioctl_init(struct dm_ioctl* io, const std::string& name) {
-    memset(io, 0, DM_BUF_SIZE);
-    io->data_size = DM_BUF_SIZE;
+void fs_mgr_dm_ioctl_init(struct dm_ioctl* io, size_t size, const std::string& name) {
+    memset(io, 0, size);
+    io->data_size = size;
     io->data_start = sizeof(struct dm_ioctl);
     io->version[0] = 4;
     io->version[1] = 0;
@@ -35,8 +35,8 @@
     }
 }
 
-bool fs_mgr_create_verity_device(struct dm_ioctl* io, const std::string& name, int fd) {
-    fs_mgr_verity_ioctl_init(io, name);
+bool fs_mgr_dm_create_device(struct dm_ioctl* io, const std::string& name, int fd) {
+    fs_mgr_dm_ioctl_init(io, sizeof(*io), name);
     if (ioctl(fd, DM_DEV_CREATE, io)) {
         PERROR << "Error creating device mapping";
         return false;
@@ -44,8 +44,8 @@
     return true;
 }
 
-bool fs_mgr_destroy_verity_device(struct dm_ioctl* io, const std::string& name, int fd) {
-    fs_mgr_verity_ioctl_init(io, name);
+bool fs_mgr_dm_destroy_device(struct dm_ioctl* io, const std::string& name, int fd) {
+    fs_mgr_dm_ioctl_init(io, sizeof(*io), name);
     if (ioctl(fd, DM_DEV_REMOVE, io)) {
         PERROR << "Error removing device mapping";
         return false;
@@ -53,13 +53,13 @@
     return true;
 }
 
-bool fs_mgr_get_verity_device_name(struct dm_ioctl* io, const std::string& name, int fd,
-                                   std::string* out_dev_name) {
+bool fs_mgr_dm_get_device_name(struct dm_ioctl* io, const std::string& name, int fd,
+                               std::string* out_dev_name) {
     FS_MGR_CHECK(out_dev_name != nullptr);
 
-    fs_mgr_verity_ioctl_init(io, name);
+    fs_mgr_dm_ioctl_init(io, sizeof(*io), name);
     if (ioctl(fd, DM_DEV_STATUS, io)) {
-        PERROR << "Error fetching verity device number";
+        PERROR << "Error fetching device-mapper device number";
         return false;
     }
 
@@ -69,10 +69,10 @@
     return true;
 }
 
-bool fs_mgr_resume_verity_table(struct dm_ioctl* io, const std::string& name, int fd) {
-    fs_mgr_verity_ioctl_init(io, name);
+bool fs_mgr_dm_resume_table(struct dm_ioctl* io, const std::string& name, int fd) {
+    fs_mgr_dm_ioctl_init(io, sizeof(*io), name);
     if (ioctl(fd, DM_DEV_SUSPEND, io)) {
-        PERROR << "Error activating verity device";
+        PERROR << "Error activating device table";
         return false;
     }
     return true;
diff --git a/fs_mgr/fs_mgr_dm_linear.cpp b/fs_mgr/fs_mgr_dm_linear.cpp
new file mode 100644
index 0000000..b2f3a68
--- /dev/null
+++ b/fs_mgr/fs_mgr_dm_linear.cpp
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#include "fs_mgr_dm_linear.h"
+
+#include <inttypes.h>
+#include <linux/dm-ioctl.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+#include <sstream>
+
+#include <android-base/logging.h>
+#include <android-base/stringprintf.h>
+#include <android-base/strings.h>
+#include <android-base/unique_fd.h>
+
+#include "fs_mgr_priv.h"
+#include "fs_mgr_priv_dm_ioctl.h"
+
+namespace android {
+namespace fs_mgr {
+
+std::string LogicalPartitionExtent::Serialize() const {
+    // Note: we need to include an explicit null-terminator.
+    std::string argv =
+        android::base::StringPrintf("%s %" PRIu64, block_device_.c_str(), first_sector_);
+    argv.push_back(0);
+
+    // The kernel expects each target to be aligned.
+    size_t spec_bytes = sizeof(struct dm_target_spec) + argv.size();
+    size_t padding = ((spec_bytes + 7) & ~7) - spec_bytes;
+    for (size_t i = 0; i < padding; i++) {
+        argv.push_back(0);
+    }
+
+    struct dm_target_spec spec;
+    spec.sector_start = logical_sector_;
+    spec.length = num_sectors_;
+    spec.status = 0;
+    strcpy(spec.target_type, "linear");
+    spec.next = sizeof(struct dm_target_spec) + argv.size();
+
+    return std::string((char*)&spec, sizeof(spec)) + argv;
+}
+
+static bool LoadDmTable(int dm_fd, const LogicalPartition& partition) {
+    // Combine all dm_target_spec buffers together.
+    std::string target_string;
+    for (const auto& extent : partition.extents) {
+        target_string += extent.Serialize();
+    }
+
+    // Allocate the ioctl buffer.
+    size_t buffer_size = sizeof(struct dm_ioctl) + target_string.size();
+    std::unique_ptr<uint8_t[]> buffer = std::make_unique<uint8_t[]>(buffer_size);
+
+    // Initialize the ioctl buffer header, then copy our target specs in.
+    struct dm_ioctl* io = reinterpret_cast<struct dm_ioctl*>(buffer.get());
+    fs_mgr_dm_ioctl_init(io, buffer_size, partition.name);
+    io->target_count = partition.extents.size();
+    if (partition.attributes & kPartitionReadonly) {
+        io->flags |= DM_READONLY_FLAG;
+    }
+    memcpy(io + 1, target_string.c_str(), target_string.size());
+
+    if (ioctl(dm_fd, DM_TABLE_LOAD, io)) {
+        PERROR << "Failed ioctl() on DM_TABLE_LOAD, partition " << partition.name;
+        return false;
+    }
+    return true;
+}
+
+static bool LoadTablesAndActivate(int dm_fd, const LogicalPartition& partition) {
+    if (!LoadDmTable(dm_fd, partition)) {
+        return false;
+    }
+
+    struct dm_ioctl io;
+    return fs_mgr_dm_resume_table(&io, partition.name, dm_fd);
+}
+
+static bool CreateDmDeviceForPartition(int dm_fd, const LogicalPartition& partition) {
+    struct dm_ioctl io;
+    if (!fs_mgr_dm_create_device(&io, partition.name, dm_fd)) {
+        return false;
+    }
+    if (!LoadTablesAndActivate(dm_fd, partition)) {
+        // Remove the device rather than leave it in an inactive state.
+        fs_mgr_dm_destroy_device(&io, partition.name, dm_fd);
+        return false;
+    }
+
+    LINFO << "Created device-mapper device: " << partition.name;
+    return true;
+}
+
+bool CreateLogicalPartitions(const LogicalPartitionTable& table) {
+    android::base::unique_fd dm_fd(open("/dev/device-mapper", O_RDWR));
+    if (dm_fd < 0) {
+        PLOG(ERROR) << "failed to open /dev/device-mapper";
+        return false;
+    }
+    for (const auto& partition : table.partitions) {
+        if (!CreateDmDeviceForPartition(dm_fd, partition)) {
+            LOG(ERROR) << "could not create dm-linear device for partition: " << partition.name;
+            return false;
+        }
+    }
+    return true;
+}
+
+std::unique_ptr<LogicalPartitionTable> LoadPartitionsFromDeviceTree() {
+    return nullptr;
+}
+
+}  // namespace fs_mgr
+}  // namespace android
diff --git a/fs_mgr/fs_mgr_fstab.cpp b/fs_mgr/fs_mgr_fstab.cpp
index 3fbef9f..af4d6c1 100644
--- a/fs_mgr/fs_mgr_fstab.cpp
+++ b/fs_mgr/fs_mgr_fstab.cpp
@@ -109,6 +109,7 @@
     {"logicalblk=", MF_LOGICALBLKSIZE},
     {"sysfs_path=", MF_SYSFS},
     {"defaults", 0},
+    {"logical", MF_LOGICAL},
     {0, 0},
 };
 
@@ -445,10 +446,6 @@
             LERROR << "dt_fstab: Failed to find device for partition " << dp->d_name;
             return {};
         }
-        if (!StartsWith(value, "/dev")) {
-            LERROR << "dt_fstab: Invalid device node for partition " << dp->d_name;
-            return {};
-        }
         fstab_entry.push_back(value);
 
         std::string mount_point;
@@ -631,6 +628,10 @@
         fstab->recs[cnt].erase_blk_size = flag_vals.erase_blk_size;
         fstab->recs[cnt].logical_blk_size = flag_vals.logical_blk_size;
         fstab->recs[cnt].sysfs_path = flag_vals.sysfs_path;
+        if (fstab->recs[cnt].fs_mgr_flags & MF_LOGICAL) {
+            fstab->recs[cnt].logical_partition_name = strdup(fstab->recs[cnt].blk_device);
+        }
+
         cnt++;
     }
     /* If an A/B partition, modify block device to be the real block device */
@@ -685,6 +686,49 @@
     return a;
 }
 
+/* Extracts <device>s from the by-name symlinks specified in a fstab:
+ *   /dev/block/<type>/<device>/by-name/<partition>
+ *
+ * <type> can be: platform, pci or vbd.
+ *
+ * For example, given the following entries in the input fstab:
+ *   /dev/block/platform/soc/1da4000.ufshc/by-name/system
+ *   /dev/block/pci/soc.0/f9824900.sdhci/by-name/vendor
+ * it returns a set { "soc/1da4000.ufshc", "soc.0/f9824900.sdhci" }.
+ */
+static std::set<std::string> extract_boot_devices(const fstab& fstab) {
+    std::set<std::string> boot_devices;
+
+    for (int i = 0; i < fstab.num_entries; i++) {
+        std::string blk_device(fstab.recs[i].blk_device);
+        // Skips blk_device that doesn't conform to the format.
+        if (!android::base::StartsWith(blk_device, "/dev/block") ||
+            android::base::StartsWith(blk_device, "/dev/block/by-name") ||
+            android::base::StartsWith(blk_device, "/dev/block/bootdevice/by-name")) {
+            continue;
+        }
+        // Skips non-by_name blk_device.
+        // /dev/block/<type>/<device>/by-name/<partition>
+        //                           ^ slash_by_name
+        auto slash_by_name = blk_device.find("/by-name");
+        if (slash_by_name == std::string::npos) continue;
+        blk_device.erase(slash_by_name);  // erases /by-name/<partition>
+
+        // Erases /dev/block/, now we have <type>/<device>
+        blk_device.erase(0, std::string("/dev/block/").size());
+
+        // <type>/<device>
+        //       ^ first_slash
+        auto first_slash = blk_device.find('/');
+        if (first_slash == std::string::npos) continue;
+
+        auto boot_device = blk_device.substr(first_slash + 1);
+        if (!boot_device.empty()) boot_devices.insert(std::move(boot_device));
+    }
+
+    return boot_devices;
+}
+
 struct fstab *fs_mgr_read_fstab(const char *fstab_path)
 {
     FILE *fstab_file;
@@ -797,6 +841,7 @@
     for (i = 0; i < fstab->num_entries; i++) {
         /* Free the pointers return by strdup(3) */
         free(fstab->recs[i].blk_device);
+        free(fstab->recs[i].logical_partition_name);
         free(fstab->recs[i].mount_point);
         free(fstab->recs[i].fs_type);
         free(fstab->recs[i].fs_options);
@@ -861,6 +906,23 @@
     return nullptr;
 }
 
+std::set<std::string> fs_mgr_get_boot_devices() {
+    // boot_devices can be specified in device tree.
+    std::string dt_value;
+    std::string file_name = get_android_dt_dir() + "/boot_devices";
+    if (read_dt_file(file_name, &dt_value)) {
+        auto boot_devices = android::base::Split(dt_value, ",");
+        return std::set<std::string>(boot_devices.begin(), boot_devices.end());
+    }
+
+    // Fallback to extract boot devices from fstab.
+    std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> fstab(fs_mgr_read_fstab_default(),
+                                                               fs_mgr_free_fstab);
+    if (fstab) return extract_boot_devices(*fstab);
+
+    return {};
+}
+
 int fs_mgr_is_voldmanaged(const struct fstab_rec *fstab)
 {
     return fstab->fs_mgr_flags & MF_VOLDMANAGED;
@@ -944,3 +1006,7 @@
 {
     return fstab->fs_mgr_flags & MF_SYSFS;
 }
+
+int fs_mgr_is_logical(const struct fstab_rec* fstab) {
+    return fstab->fs_mgr_flags & MF_LOGICAL;
+}
diff --git a/fs_mgr/fs_mgr_priv.h b/fs_mgr/fs_mgr_priv.h
index ade0cc4..afd7227 100644
--- a/fs_mgr/fs_mgr_priv.h
+++ b/fs_mgr/fs_mgr_priv.h
@@ -82,6 +82,7 @@
  *
  */
 
+// clang-format off
 #define MF_WAIT                  0x1
 #define MF_CHECK                 0x2
 #define MF_CRYPT                 0x4
@@ -111,6 +112,8 @@
 #define MF_AVB             0X2000000
 #define MF_KEYDIRECTORY    0X4000000
 #define MF_SYSFS           0X8000000
+#define MF_LOGICAL        0x10000000
+// clang-format on
 
 #define DM_BUF_SIZE 4096
 
diff --git a/fs_mgr/fs_mgr_priv_dm_ioctl.h b/fs_mgr/fs_mgr_priv_dm_ioctl.h
index 792683e..792475d 100644
--- a/fs_mgr/fs_mgr_priv_dm_ioctl.h
+++ b/fs_mgr/fs_mgr_priv_dm_ioctl.h
@@ -20,15 +20,15 @@
 #include <linux/dm-ioctl.h>
 #include <string>
 
-void fs_mgr_verity_ioctl_init(struct dm_ioctl* io, const std::string& name);
+void fs_mgr_dm_ioctl_init(struct dm_ioctl* io, size_t size, const std::string& name);
 
-bool fs_mgr_create_verity_device(struct dm_ioctl* io, const std::string& name, int fd);
+bool fs_mgr_dm_create_device(struct dm_ioctl* io, const std::string& name, int fd);
 
-bool fs_mgr_destroy_verity_device(struct dm_ioctl* io, const std::string& name, int fd);
+bool fs_mgr_dm_destroy_device(struct dm_ioctl* io, const std::string& name, int fd);
 
-bool fs_mgr_get_verity_device_name(struct dm_ioctl* io, const std::string& name, int fd,
-                                   std::string* out_dev_name);
+bool fs_mgr_dm_get_device_name(struct dm_ioctl* io, const std::string& name, int fd,
+                               std::string* out_dev_name);
 
-bool fs_mgr_resume_verity_table(struct dm_ioctl* io, const std::string& name, int fd);
+bool fs_mgr_dm_resume_table(struct dm_ioctl* io, const std::string& name, int fd);
 
 #endif /* __CORE_FS_MGR_PRIV_DM_IOCTL_H */
diff --git a/fs_mgr/fs_mgr_slotselect.cpp b/fs_mgr/fs_mgr_slotselect.cpp
index 0a113b4..3b01d0e 100644
--- a/fs_mgr/fs_mgr_slotselect.cpp
+++ b/fs_mgr/fs_mgr_slotselect.cpp
@@ -36,19 +36,30 @@
     std::string ab_suffix;
 
     for (n = 0; n < fstab->num_entries; n++) {
-        if (fstab->recs[n].fs_mgr_flags & MF_SLOTSELECT) {
-            char *tmp;
+        fstab_rec& record = fstab->recs[n];
+        if (record.fs_mgr_flags & MF_SLOTSELECT) {
             if (ab_suffix.empty()) {
                 ab_suffix = fs_mgr_get_slot_suffix();
                 // Return false if failed to get ab_suffix when MF_SLOTSELECT is specified.
                 if (ab_suffix.empty()) return false;
             }
-            if (asprintf(&tmp, "%s%s", fstab->recs[n].blk_device, ab_suffix.c_str()) > 0) {
-                free(fstab->recs[n].blk_device);
-                fstab->recs[n].blk_device = tmp;
-            } else {
+
+            char* new_blk_device;
+            if (asprintf(&new_blk_device, "%s%s", record.blk_device, ab_suffix.c_str()) <= 0) {
                 return false;
             }
+            free(record.blk_device);
+            record.blk_device = new_blk_device;
+
+            char* new_partition_name;
+            if (record.logical_partition_name) {
+                if (asprintf(&new_partition_name, "%s%s", record.logical_partition_name,
+                             ab_suffix.c_str()) <= 0) {
+                    return false;
+                }
+                free(record.logical_partition_name);
+                record.logical_partition_name = new_partition_name;
+            }
         }
     }
     return true;
diff --git a/fs_mgr/fs_mgr_verity.cpp b/fs_mgr/fs_mgr_verity.cpp
index d0bb058..fe41f8a 100644
--- a/fs_mgr/fs_mgr_verity.cpp
+++ b/fs_mgr/fs_mgr_verity.cpp
@@ -258,7 +258,7 @@
     char *buffer = (char*) io;
     size_t bufsize;
 
-    fs_mgr_verity_ioctl_init(io, name);
+    fs_mgr_dm_ioctl_init(io, DM_BUF_SIZE, name);
 
     struct dm_target_spec *tgt = (struct dm_target_spec *) &buffer[sizeof(struct dm_ioctl)];
 
@@ -805,13 +805,13 @@
     }
 
     // create the device
-    if (!fs_mgr_create_verity_device(io, mount_point, fd)) {
+    if (!fs_mgr_dm_create_device(io, mount_point, fd)) {
         LERROR << "Couldn't create verity device!";
         goto out;
     }
 
     // get the name of the device file
-    if (!fs_mgr_get_verity_device_name(io, mount_point, fd, &verity_blk_name)) {
+    if (!fs_mgr_dm_get_device_name(io, mount_point, fd, &verity_blk_name)) {
         LERROR << "Couldn't get verity device number!";
         goto out;
     }
@@ -900,7 +900,7 @@
 loaded:
 
     // activate the device
-    if (!fs_mgr_resume_verity_table(io, mount_point, fd)) {
+    if (!fs_mgr_dm_resume_table(io, mount_point, fd)) {
         goto out;
     }
 
@@ -923,7 +923,7 @@
     if (!verified_at_boot) {
         free(fstab->blk_device);
         fstab->blk_device = strdup(verity_blk_name.c_str());
-    } else if (!fs_mgr_destroy_verity_device(io, mount_point, fd)) {
+    } else if (!fs_mgr_dm_destroy_device(io, mount_point, fd)) {
         LERROR << "Failed to remove verity device " << mount_point.c_str();
         goto out;
     }
diff --git a/fs_mgr/include/fs_mgr.h b/fs_mgr/include/fs_mgr.h
index 653d8fa..72f019e 100644
--- a/fs_mgr/include/fs_mgr.h
+++ b/fs_mgr/include/fs_mgr.h
@@ -76,6 +76,7 @@
 bool fs_mgr_load_verity_state(int* mode);
 bool fs_mgr_update_verity_state(fs_mgr_verity_state_callback callback);
 int fs_mgr_swapon_all(struct fstab *fstab);
+bool fs_mgr_update_logical_partition(struct fstab_rec* rec);
 
 int fs_mgr_do_format(struct fstab_rec *fstab, bool reserve_footer);
 
diff --git a/fs_mgr/include/fs_mgr_dm_linear.h b/fs_mgr/include/fs_mgr_dm_linear.h
new file mode 100644
index 0000000..7f928e5
--- /dev/null
+++ b/fs_mgr/include/fs_mgr_dm_linear.h
@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Permission is hereby granted, free of charge, to any person
+ * obtaining a copy of this software and associated documentation
+ * files (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy,
+ * modify, merge, publish, distribute, sublicense, and/or sell copies
+ * of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
+ * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+ * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef __CORE_FS_MGR_DM_LINEAR_H
+#define __CORE_FS_MGR_DM_LINEAR_H
+
+#include <stdint.h>
+#include <memory>
+#include <string>
+#include <vector>
+
+namespace android {
+namespace fs_mgr {
+
+static const uint32_t kPartitionReadonly = 0x1;
+
+class LogicalPartitionExtent {
+  public:
+    LogicalPartitionExtent() : logical_sector_(0), first_sector_(0), num_sectors_(0) {}
+    LogicalPartitionExtent(uint64_t logical_sector, uint64_t first_sector, uint64_t num_sectors,
+                           const std::string& block_device)
+        : logical_sector_(logical_sector),
+          first_sector_(first_sector),
+          num_sectors_(num_sectors),
+          block_device_(block_device) {}
+
+    // Return a string containing the dm_target_spec buffer needed to use this
+    // extent in a device-mapper table.
+    std::string Serialize() const;
+
+    const std::string& block_device() const { return block_device_; }
+
+  private:
+    // Logical sector this extent represents in the presented block device.
+    // This is equal to the previous extent's logical sector plus the number
+    // of sectors in that extent. The first extent always starts at 0.
+    uint64_t logical_sector_;
+    // First 512-byte sector of this extent, on the source block device.
+    uint64_t first_sector_;
+    // Number of 512-byte sectors.
+    uint64_t num_sectors_;
+    // Target block device.
+    std::string block_device_;
+};
+
+struct LogicalPartition {
+    LogicalPartition() : attributes(0), num_sectors(0) {}
+
+    std::string name;
+    uint32_t attributes;
+    // Number of 512-byte sectors total.
+    uint64_t num_sectors;
+    // List of extents.
+    std::vector<LogicalPartitionExtent> extents;
+};
+
+struct LogicalPartitionTable {
+    // List of partitions in the partition table.
+    std::vector<LogicalPartition> partitions;
+};
+
+// Load a dm-linear table from the device tree if one is available; otherwise,
+// return null.
+std::unique_ptr<LogicalPartitionTable> LoadPartitionsFromDeviceTree();
+
+// Create device-mapper devices for the given partition table.
+//
+// On success, two devices nodes will be created for each partition, both
+// pointing to the same device:
+//   /dev/block/dm-<N> where N is a sequential ID assigned by device-mapper.
+//   /dev/block/dm-<name> where |name| is the partition name.
+//
+bool CreateLogicalPartitions(const LogicalPartitionTable& table);
+
+}  // namespace fs_mgr
+}  // namespace android
+
+#endif  // __CORE_FS_MGR_DM_LINEAR_H
diff --git a/fs_mgr/include_fstab/fstab/fstab.h b/fs_mgr/include_fstab/fstab/fstab.h
index 8c585dd..d232cca 100644
--- a/fs_mgr/include_fstab/fstab/fstab.h
+++ b/fs_mgr/include_fstab/fstab/fstab.h
@@ -22,6 +22,7 @@
 #include <stdint.h>
 #include <stdio.h>
 
+#include <set>
 #include <string>
 
 /*
@@ -37,6 +38,7 @@
 
 struct fstab_rec {
     char* blk_device;
+    char* logical_partition_name;
     char* mount_point;
     char* fs_type;
     unsigned long flags;
@@ -84,8 +86,10 @@
 int fs_mgr_is_nofail(const struct fstab_rec* fstab);
 int fs_mgr_is_latemount(const struct fstab_rec* fstab);
 int fs_mgr_is_quota(const struct fstab_rec* fstab);
+int fs_mgr_is_logical(const struct fstab_rec* fstab);
 int fs_mgr_has_sysfs_path(const struct fstab_rec* fstab);
 
 std::string fs_mgr_get_slot_suffix();
+std::set<std::string> fs_mgr_get_boot_devices();
 
 #endif /* __CORE_FS_TAB_H */
diff --git a/init/Android.bp b/init/Android.bp
index a31c5a5..63f3fca 100644
--- a/init/Android.bp
+++ b/init/Android.bp
@@ -100,6 +100,7 @@
         "capabilities.cpp",
         "descriptors.cpp",
         "devices.cpp",
+        "epoll.cpp",
         "firmware_handler.cpp",
         "import_parser.cpp",
         "init.cpp",
diff --git a/init/README.md b/init/README.md
index c08b07a..550ef05 100644
--- a/init/README.md
+++ b/init/README.md
@@ -195,6 +195,10 @@
 > This service will not automatically start with its class.
   It must be explicitly started by name or by interface name.
 
+`enter_namespace <type> <path>`
+> Enters the namespace of type _type_ located at _path_. Only network namespaces are supported with
+  _type_ set to "net". Note that only one namespace of a given _type_ may be entered.
+
 `file <path> <type>`
 > Open a file path and pass its fd to the launched process. _type_ must be
   "r", "w" or "rw".  For native executables see libcutils
diff --git a/init/builtins.cpp b/init/builtins.cpp
index 8bd92cc..17d34e1 100644
--- a/init/builtins.cpp
+++ b/init/builtins.cpp
@@ -240,6 +240,29 @@
     return Success();
 }
 
+static Result<Success> do_interface_restart(const BuiltinArguments& args) {
+    Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
+    if (!svc) return Error() << "interface " << args[1] << " not found";
+    svc->Restart();
+    return Success();
+}
+
+static Result<Success> do_interface_start(const BuiltinArguments& args) {
+    Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
+    if (!svc) return Error() << "interface " << args[1] << " not found";
+    if (auto result = svc->Start(); !result) {
+        return Error() << "Could not start interface: " << result.error();
+    }
+    return Success();
+}
+
+static Result<Success> do_interface_stop(const BuiltinArguments& args) {
+    Service* svc = ServiceList::GetInstance().FindInterface(args[1]);
+    if (!svc) return Error() << "interface " << args[1] << " not found";
+    svc->Stop();
+    return Success();
+}
+
 // mkdir <path> [mode] [owner] [group]
 static Result<Success> do_mkdir(const BuiltinArguments& args) {
     mode_t mode = 0755;
@@ -1050,6 +1073,9 @@
         {"init_user0",              {0,     0,    {false,  do_init_user0}}},
         {"insmod",                  {1,     kMax, {true,   do_insmod}}},
         {"installkey",              {1,     1,    {false,  do_installkey}}},
+        {"interface_restart",       {1,     1,    {false,  do_interface_restart}}},
+        {"interface_start",         {1,     1,    {false,  do_interface_start}}},
+        {"interface_stop",          {1,     1,    {false,  do_interface_stop}}},
         {"load_persist_props",      {0,     0,    {false,  do_load_persist_props}}},
         {"load_system_props",       {0,     0,    {false,  do_load_system_props}}},
         {"loglevel",                {1,     1,    {false,  do_loglevel}}},
diff --git a/init/devices.cpp b/init/devices.cpp
index 8d27f4f..ada1e28 100644
--- a/init/devices.cpp
+++ b/init/devices.cpp
@@ -329,10 +329,10 @@
                          << partition_name_sanitized << "'";
         }
         links.emplace_back(link_path + "/by-name/" + partition_name_sanitized);
-    }
-
-    if (uevent.partition_num >= 0) {
-        links.emplace_back(link_path + "/by-num/p" + std::to_string(uevent.partition_num));
+        // Adds symlink: /dev/block/by-name/<partition_name>.
+        if (boot_devices_.find(device) != boot_devices_.end()) {
+            links.emplace_back("/dev/block/by-name/" + partition_name_sanitized);
+        }
     }
 
     auto last_slash = uevent.path.rfind('/');
@@ -350,8 +350,14 @@
                 PLOG(ERROR) << "Failed to create directory " << Dirname(link);
             }
 
-            if (symlink(devpath.c_str(), link.c_str()) && errno != EEXIST) {
-                PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link;
+            if (symlink(devpath.c_str(), link.c_str())) {
+                if (errno != EEXIST) {
+                    PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link;
+                } else if (std::string link_path;
+                           Readlink(link, &link_path) && link_path != devpath) {
+                    PLOG(ERROR) << "Failed to symlink " << devpath << " to " << link
+                                << ", which already links to: " << link_path;
+                }
             }
         }
     }
@@ -415,16 +421,18 @@
 
 DeviceHandler::DeviceHandler(std::vector<Permissions> dev_permissions,
                              std::vector<SysfsPermissions> sysfs_permissions,
-                             std::vector<Subsystem> subsystems, bool skip_restorecon)
+                             std::vector<Subsystem> subsystems, std::set<std::string> boot_devices,
+                             bool skip_restorecon)
     : dev_permissions_(std::move(dev_permissions)),
       sysfs_permissions_(std::move(sysfs_permissions)),
       subsystems_(std::move(subsystems)),
+      boot_devices_(std::move(boot_devices)),
       skip_restorecon_(skip_restorecon),
       sysfs_mount_point_("/sys") {}
 
 DeviceHandler::DeviceHandler()
     : DeviceHandler(std::vector<Permissions>{}, std::vector<SysfsPermissions>{},
-                    std::vector<Subsystem>{}, false) {}
+                    std::vector<Subsystem>{}, std::set<std::string>{}, false) {}
 
 }  // namespace init
 }  // namespace android
diff --git a/init/devices.h b/init/devices.h
index 1f8f1e8..f9035da 100644
--- a/init/devices.h
+++ b/init/devices.h
@@ -21,6 +21,7 @@
 #include <sys/types.h>
 
 #include <algorithm>
+#include <set>
 #include <string>
 #include <vector>
 
@@ -103,8 +104,8 @@
 
     DeviceHandler();
     DeviceHandler(std::vector<Permissions> dev_permissions,
-                  std::vector<SysfsPermissions> sysfs_permissions,
-                  std::vector<Subsystem> subsystems, bool skip_restorecon);
+                  std::vector<SysfsPermissions> sysfs_permissions, std::vector<Subsystem> subsystems,
+                  std::set<std::string> boot_devices, bool skip_restorecon);
     ~DeviceHandler(){};
 
     void HandleDeviceEvent(const Uevent& uevent);
@@ -125,6 +126,7 @@
     std::vector<Permissions> dev_permissions_;
     std::vector<SysfsPermissions> sysfs_permissions_;
     std::vector<Subsystem> subsystems_;
+    std::set<std::string> boot_devices_;
     bool skip_restorecon_;
     std::string sysfs_mount_point_;
 };
diff --git a/init/devices_test.cpp b/init/devices_test.cpp
index eba00cb..d658f4d 100644
--- a/init/devices_test.cpp
+++ b/init/devices_test.cpp
@@ -84,7 +84,6 @@
     };
     std::vector<std::string> expected_result{
         "/dev/block/platform/soc.0/f9824900.sdhci/by-name/modem",
-        "/dev/block/platform/soc.0/f9824900.sdhci/by-num/p1",
         "/dev/block/platform/soc.0/f9824900.sdhci/mmcblk0p1",
     };
 
@@ -100,7 +99,6 @@
         .partition_num = 1,
     };
     std::vector<std::string> expected_result{
-        "/dev/block/platform/soc.0/f9824900.sdhci/by-num/p1",
         "/dev/block/platform/soc.0/f9824900.sdhci/mmcblk0p1",
     };
 
diff --git a/init/epoll.cpp b/init/epoll.cpp
new file mode 100644
index 0000000..4bca09e
--- /dev/null
+++ b/init/epoll.cpp
@@ -0,0 +1,84 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "epoll.h"
+
+#include <sys/epoll.h>
+
+#include <chrono>
+#include <functional>
+#include <map>
+
+namespace android {
+namespace init {
+
+Epoll::Epoll() {}
+
+Result<Success> Epoll::Open() {
+    if (epoll_fd_ >= 0) return Success();
+    epoll_fd_.reset(epoll_create1(EPOLL_CLOEXEC));
+
+    if (epoll_fd_ == -1) {
+        return ErrnoError() << "epoll_create1 failed";
+    }
+    return Success();
+}
+
+Result<Success> Epoll::RegisterHandler(int fd, std::function<void()> handler) {
+    auto [it, inserted] = epoll_handlers_.emplace(fd, std::move(handler));
+    if (!inserted) {
+        return Error() << "Cannot specify two epoll handlers for a given FD";
+    }
+    epoll_event ev;
+    ev.events = EPOLLIN;
+    // std::map's iterators do not get invalidated until erased, so we use the
+    // pointer to the std::function in the map directly for epoll_ctl.
+    ev.data.ptr = reinterpret_cast<void*>(&it->second);
+    if (epoll_ctl(epoll_fd_, EPOLL_CTL_ADD, fd, &ev) == -1) {
+        Result<Success> result = ErrnoError() << "epoll_ctl failed to add fd";
+        epoll_handlers_.erase(fd);
+        return result;
+    }
+    return Success();
+}
+
+Result<Success> Epoll::UnregisterHandler(int fd) {
+    if (epoll_ctl(epoll_fd_, EPOLL_CTL_DEL, fd, nullptr) == -1) {
+        return ErrnoError() << "epoll_ctl failed to remove fd";
+    }
+    if (epoll_handlers_.erase(fd) != 1) {
+        return Error() << "Attempting to remove epoll handler for FD without an existing handler";
+    }
+    return Success();
+}
+
+Result<Success> Epoll::Wait(std::optional<std::chrono::milliseconds> timeout) {
+    int timeout_ms = -1;
+    if (timeout && timeout->count() < INT_MAX) {
+        timeout_ms = timeout->count();
+    }
+    epoll_event ev;
+    auto nr = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd_, &ev, 1, timeout_ms));
+    if (nr == -1) {
+        return ErrnoError() << "epoll_wait failed";
+    } else if (nr == 1) {
+        std::invoke(*reinterpret_cast<std::function<void()>*>(ev.data.ptr));
+    }
+    return Success();
+}
+
+}  // namespace init
+}  // namespace android
diff --git a/init/epoll.h b/init/epoll.h
new file mode 100644
index 0000000..85a791c
--- /dev/null
+++ b/init/epoll.h
@@ -0,0 +1,49 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef _INIT_EPOLL_H
+#define _INIT_EPOLL_H
+
+#include <chrono>
+#include <functional>
+#include <map>
+#include <optional>
+
+#include <android-base/unique_fd.h>
+
+#include "result.h"
+
+namespace android {
+namespace init {
+
+class Epoll {
+  public:
+    Epoll();
+
+    Result<Success> Open();
+    Result<Success> RegisterHandler(int fd, std::function<void()> handler);
+    Result<Success> UnregisterHandler(int fd);
+    Result<Success> Wait(std::optional<std::chrono::milliseconds> timeout);
+
+  private:
+    android::base::unique_fd epoll_fd_;
+    std::map<int, std::function<void()>> epoll_handlers_;
+};
+
+}  // namespace init
+}  // namespace android
+
+#endif
diff --git a/init/host_init_stubs.cpp b/init/host_init_stubs.cpp
index e6cc08a..4451ac8 100644
--- a/init/host_init_stubs.cpp
+++ b/init/host_init_stubs.cpp
@@ -49,6 +49,10 @@
 }
 
 // selinux.h
+bool SelinuxHasVendorInit() {
+    return true;
+}
+
 void SelabelInitialize() {}
 
 bool SelabelLookupFileContext(const std::string& key, int type, std::string* result) {
diff --git a/init/host_init_stubs.h b/init/host_init_stubs.h
index ddfb7ae..bb241af 100644
--- a/init/host_init_stubs.h
+++ b/init/host_init_stubs.h
@@ -35,11 +35,6 @@
 
 std::string GetProperty(const std::string& key, const std::string& default_value);
 bool GetBoolProperty(const std::string& key, bool default_value);
-template <typename T>
-T GetIntProperty(const std::string&, T default_value, T = std::numeric_limits<T>::min(),
-                 T = std::numeric_limits<T>::max()) {
-    return default_value;
-}
 
 }  // namespace base
 }  // namespace android
@@ -56,6 +51,7 @@
                            const std::string& source_context, const ucred& cr, std::string* error);
 
 // selinux.h
+bool SelinuxHasVendorInit();
 void SelabelInitialize();
 bool SelabelLookupFileContext(const std::string& key, int type, std::string* result);
 
diff --git a/init/init.cpp b/init/init.cpp
index 0d5690b..fd9a90c 100644
--- a/init/init.cpp
+++ b/init/init.cpp
@@ -24,13 +24,16 @@
 #include <signal.h>
 #include <stdlib.h>
 #include <string.h>
-#include <sys/epoll.h>
 #include <sys/mount.h>
 #include <sys/signalfd.h>
 #include <sys/sysmacros.h>
 #include <sys/types.h>
 #include <unistd.h>
 
+#include <map>
+#include <memory>
+#include <optional>
+
 #include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
@@ -43,10 +46,8 @@
 #include <private/android_filesystem_config.h>
 #include <selinux/android.h>
 
-#include <memory>
-#include <optional>
-
 #include "action_parser.h"
+#include "epoll.h"
 #include "import_parser.h"
 #include "init_first_stage.h"
 #include "keychords.h"
@@ -60,6 +61,7 @@
 #include "util.h"
 #include "watchdogd.h"
 
+using namespace std::chrono_literals;
 using namespace std::string_literals;
 
 using android::base::boot_clock;
@@ -78,7 +80,6 @@
 
 std::string default_console = "/dev/console";
 
-static int epoll_fd = -1;
 static int signal_fd = -1;
 
 static std::unique_ptr<Timer> waiting_for_prop(nullptr);
@@ -130,15 +131,6 @@
     }
 }
 
-void register_epoll_handler(int fd, void (*fn)()) {
-    epoll_event ev;
-    ev.events = EPOLLIN;
-    ev.data.ptr = reinterpret_cast<void*>(fn);
-    if (epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev) == -1) {
-        PLOG(ERROR) << "epoll_ctl failed";
-    }
-}
-
 bool start_waiting_for_property(const char *name, const char *value)
 {
     if (waiting_for_prop) {
@@ -277,40 +269,29 @@
 
     const ControlMessageFunction& function = it->second;
 
-    if (function.target == ControlTarget::SERVICE) {
-        Service* svc = ServiceList::GetInstance().FindService(name);
-        if (svc == nullptr) {
-            LOG(ERROR) << "No such service '" << name << "' for ctl." << msg;
-            return;
-        }
-        if (auto result = function.action(svc); !result) {
-            LOG(ERROR) << "Could not ctl." << msg << " for service " << name << ": "
-                       << result.error();
-        }
+    Service* svc = nullptr;
 
+    switch (function.target) {
+        case ControlTarget::SERVICE:
+            svc = ServiceList::GetInstance().FindService(name);
+            break;
+        case ControlTarget::INTERFACE:
+            svc = ServiceList::GetInstance().FindInterface(name);
+            break;
+        default:
+            LOG(ERROR) << "Invalid function target from static map key '" << msg << "': "
+                       << static_cast<std::underlying_type<ControlTarget>::type>(function.target);
+            return;
+    }
+
+    if (svc == nullptr) {
+        LOG(ERROR) << "Could not find '" << name << "' for ctl." << msg;
         return;
     }
 
-    if (function.target == ControlTarget::INTERFACE) {
-        for (const auto& svc : ServiceList::GetInstance()) {
-            if (svc->interfaces().count(name) == 0) {
-                continue;
-            }
-
-            if (auto result = function.action(svc.get()); !result) {
-                LOG(ERROR) << "Could not handle ctl." << msg << " for service " << svc->name()
-                           << " with interface " << name << ": " << result.error();
-            }
-
-            return;
-        }
-
-        LOG(ERROR) << "Could not find service hosting interface " << name;
-        return;
+    if (auto result = function.action(svc); !result) {
+        LOG(ERROR) << "Could not ctl." << msg << " for '" << name << "': " << result.error();
     }
-
-    LOG(ERROR) << "Invalid function target from static map key '" << msg
-               << "': " << static_cast<std::underlying_type<ControlTarget>::type>(function.target);
 }
 
 static Result<Success> wait_for_coldboot_done_action(const BuiltinArguments& args) {
@@ -334,11 +315,6 @@
     return Success();
 }
 
-static Result<Success> keychord_init_action(const BuiltinArguments& args) {
-    keychord_init();
-    return Success();
-}
-
 static Result<Success> console_init_action(const BuiltinArguments& args) {
     std::string console = GetProperty("ro.boot.console", "");
     if (!console.empty()) {
@@ -541,7 +517,7 @@
     }
 }
 
-static void InstallSignalFdHandler() {
+static void InstallSignalFdHandler(Epoll* epoll) {
     // Applying SA_NOCLDSTOP to a defaulted SIGCHLD handler prevents the signalfd from receiving
     // SIGCHLD when a child process stops or continues (b/77867680#comment9).
     const struct sigaction act { .sa_handler = SIG_DFL, .sa_flags = SA_NOCLDSTOP };
@@ -572,7 +548,9 @@
         PLOG(FATAL) << "failed to create signalfd";
     }
 
-    register_epoll_handler(signal_fd, HandleSignalFd);
+    if (auto result = epoll->RegisterHandler(signal_fd, HandleSignalFd); !result) {
+        LOG(FATAL) << result.error();
+    }
 }
 
 int main(int argc, char** argv) {
@@ -718,16 +696,16 @@
     SelabelInitialize();
     SelinuxRestoreContext();
 
-    epoll_fd = epoll_create1(EPOLL_CLOEXEC);
-    if (epoll_fd == -1) {
-        PLOG(FATAL) << "epoll_create1 failed";
+    Epoll epoll;
+    if (auto result = epoll.Open(); !result) {
+        PLOG(FATAL) << result.error();
     }
 
-    InstallSignalFdHandler();
+    InstallSignalFdHandler(&epoll);
 
     property_load_boot_defaults();
     export_oem_lock_status();
-    start_property_service();
+    StartPropertyService(&epoll);
     set_usb_controller();
 
     const BuiltinFunctionMap function_map;
@@ -752,7 +730,12 @@
     am.QueueBuiltinAction(MixHwrngIntoLinuxRngAction, "MixHwrngIntoLinuxRng");
     am.QueueBuiltinAction(SetMmapRndBitsAction, "SetMmapRndBits");
     am.QueueBuiltinAction(SetKptrRestrictAction, "SetKptrRestrict");
-    am.QueueBuiltinAction(keychord_init_action, "keychord_init");
+    am.QueueBuiltinAction(
+        [&epoll](const BuiltinArguments& args) -> Result<Success> {
+            KeychordInit(&epoll);
+            return Success();
+        },
+        "KeychordInit");
     am.QueueBuiltinAction(console_init_action, "console_init");
 
     // Trigger all the boot actions to get us started.
@@ -775,7 +758,7 @@
 
     while (true) {
         // By default, sleep until something happens.
-        int epoll_timeout_ms = -1;
+        auto epoll_timeout = std::optional<std::chrono::milliseconds>{};
 
         if (do_shutdown && !shutting_down) {
             do_shutdown = false;
@@ -793,23 +776,18 @@
 
                 // If there's a process that needs restarting, wake up in time for that.
                 if (next_process_restart_time) {
-                    epoll_timeout_ms = std::chrono::ceil<std::chrono::milliseconds>(
-                                           *next_process_restart_time - boot_clock::now())
-                                           .count();
-                    if (epoll_timeout_ms < 0) epoll_timeout_ms = 0;
+                    epoll_timeout = std::chrono::ceil<std::chrono::milliseconds>(
+                        *next_process_restart_time - boot_clock::now());
+                    if (*epoll_timeout < 0ms) epoll_timeout = 0ms;
                 }
             }
 
             // If there's more work to do, wake up again immediately.
-            if (am.HasMoreCommands()) epoll_timeout_ms = 0;
+            if (am.HasMoreCommands()) epoll_timeout = 0ms;
         }
 
-        epoll_event ev;
-        int nr = TEMP_FAILURE_RETRY(epoll_wait(epoll_fd, &ev, 1, epoll_timeout_ms));
-        if (nr == -1) {
-            PLOG(ERROR) << "epoll_wait failed";
-        } else if (nr == 1) {
-            ((void (*)()) ev.data.ptr)();
+        if (auto result = epoll.Wait(epoll_timeout); !result) {
+            LOG(ERROR) << result.error();
         }
     }
 
diff --git a/init/init.h b/init/init.h
index d4a0e96..6c82fa1 100644
--- a/init/init.h
+++ b/init/init.h
@@ -19,6 +19,7 @@
 
 #include <sys/types.h>
 
+#include <functional>
 #include <string>
 #include <vector>
 
@@ -42,8 +43,6 @@
 
 void property_changed(const std::string& name, const std::string& value);
 
-void register_epoll_handler(int fd, void (*fn)());
-
 bool start_waiting_for_property(const char *name, const char *value);
 
 void DumpState();
diff --git a/init/init_first_stage.cpp b/init/init_first_stage.cpp
index 1b6e97e..34de640 100644
--- a/init/init_first_stage.cpp
+++ b/init/init_first_stage.cpp
@@ -33,11 +33,13 @@
 #include "devices.h"
 #include "fs_mgr.h"
 #include "fs_mgr_avb.h"
+#include "fs_mgr_dm_linear.h"
 #include "uevent.h"
 #include "uevent_listener.h"
 #include "util.h"
 
 using android::base::Timer;
+using android::fs_mgr::LogicalPartitionTable;
 
 namespace android {
 namespace init {
@@ -58,21 +60,24 @@
   protected:
     ListenerAction HandleBlockDevice(const std::string& name, const Uevent&);
     bool InitRequiredDevices();
-    bool InitVerityDevice(const std::string& verity_device);
+    bool InitMappedDevice(const std::string& verity_device);
+    bool CreateLogicalPartitions();
     bool MountPartitions();
+    bool GetBackingDmLinearDevices();
 
     virtual ListenerAction UeventCallback(const Uevent& uevent);
 
     // Pure virtual functions.
-    virtual bool GetRequiredDevices() = 0;
+    virtual bool GetDmVerityDevices() = 0;
     virtual bool SetUpDmVerity(fstab_rec* fstab_rec) = 0;
 
     bool need_dm_verity_;
 
     std::unique_ptr<fstab, decltype(&fs_mgr_free_fstab)> device_tree_fstab_;
+    std::unique_ptr<LogicalPartitionTable> dm_linear_table_;
     std::vector<fstab_rec*> mount_fstab_recs_;
     std::set<std::string> required_devices_partition_names_;
-    DeviceHandler device_handler_;
+    std::unique_ptr<DeviceHandler> device_handler_;
     UeventListener uevent_listener_;
 };
 
@@ -82,7 +87,7 @@
     ~FirstStageMountVBootV1() override = default;
 
   protected:
-    bool GetRequiredDevices() override;
+    bool GetDmVerityDevices() override;
     bool SetUpDmVerity(fstab_rec* fstab_rec) override;
 };
 
@@ -95,7 +100,7 @@
 
   protected:
     ListenerAction UeventCallback(const Uevent& uevent) override;
-    bool GetRequiredDevices() override;
+    bool GetDmVerityDevices() override;
     bool SetUpDmVerity(fstab_rec* fstab_rec) override;
     bool InitAvbHandle();
 
@@ -114,6 +119,17 @@
     return access("/sbin/recovery", F_OK) == 0;
 }
 
+static inline bool IsDmLinearEnabled() {
+    bool enabled = false;
+    import_kernel_cmdline(
+        false, [&enabled](const std::string& key, const std::string& value, bool in_qemu) {
+            if (key == "androidboot.lrap" && value == "1") {
+                enabled = true;
+            }
+        });
+    return enabled;
+}
+
 // Class Definitions
 // -----------------
 FirstStageMount::FirstStageMount()
@@ -127,6 +143,15 @@
     } else {
         LOG(INFO) << "Failed to read fstab from device tree";
     }
+
+    if (IsDmLinearEnabled()) {
+        dm_linear_table_ = android::fs_mgr::LoadPartitionsFromDeviceTree();
+    }
+
+    auto boot_devices = fs_mgr_get_boot_devices();
+    device_handler_ =
+        std::make_unique<DeviceHandler>(std::vector<Permissions>{}, std::vector<SysfsPermissions>{},
+                                        std::vector<Subsystem>{}, std::move(boot_devices), false);
 }
 
 std::unique_ptr<FirstStageMount> FirstStageMount::Create() {
@@ -138,7 +163,7 @@
 }
 
 bool FirstStageMount::DoFirstStageMount() {
-    if (mount_fstab_recs_.empty()) {
+    if (!dm_linear_table_ && mount_fstab_recs_.empty()) {
         // Nothing to mount.
         LOG(INFO) << "First stage mount skipped (missing/incompatible/empty fstab in device tree)";
         return true;
@@ -146,13 +171,30 @@
 
     if (!InitDevices()) return false;
 
+    if (!CreateLogicalPartitions()) return false;
+
     if (!MountPartitions()) return false;
 
     return true;
 }
 
 bool FirstStageMount::InitDevices() {
-    return GetRequiredDevices() && InitRequiredDevices();
+    return GetBackingDmLinearDevices() && GetDmVerityDevices() && InitRequiredDevices();
+}
+
+bool FirstStageMount::GetBackingDmLinearDevices() {
+    // Add any additional devices required for dm-linear mappings.
+    if (!dm_linear_table_) {
+        return true;
+    }
+
+    for (const auto& partition : dm_linear_table_->partitions) {
+        for (const auto& extent : partition.extents) {
+            const std::string& partition_name = android::base::Basename(extent.block_device());
+            required_devices_partition_names_.emplace(partition_name);
+        }
+    }
+    return true;
 }
 
 // Creates devices with uevent->partition_name matching one in the member variable
@@ -163,12 +205,12 @@
         return true;
     }
 
-    if (need_dm_verity_) {
+    if (dm_linear_table_ || need_dm_verity_) {
         const std::string dm_path = "/devices/virtual/misc/device-mapper";
         bool found = false;
         auto dm_callback = [this, &dm_path, &found](const Uevent& uevent) {
             if (uevent.path == dm_path) {
-                device_handler_.HandleDeviceEvent(uevent);
+                device_handler_->HandleDeviceEvent(uevent);
                 found = true;
                 return ListenerAction::kStop;
             }
@@ -210,6 +252,13 @@
     return true;
 }
 
+bool FirstStageMount::CreateLogicalPartitions() {
+    if (!dm_linear_table_) {
+        return true;
+    }
+    return android::fs_mgr::CreateLogicalPartitions(*dm_linear_table_.get());
+}
+
 ListenerAction FirstStageMount::HandleBlockDevice(const std::string& name, const Uevent& uevent) {
     // Matches partition name to create device nodes.
     // Both required_devices_partition_names_ and uevent->partition_name have A/B
@@ -218,7 +267,7 @@
     if (iter != required_devices_partition_names_.end()) {
         LOG(VERBOSE) << __PRETTY_FUNCTION__ << ": found partition: " << *iter;
         required_devices_partition_names_.erase(iter);
-        device_handler_.HandleDeviceEvent(uevent);
+        device_handler_->HandleDeviceEvent(uevent);
         if (required_devices_partition_names_.empty()) {
             return ListenerAction::kStop;
         } else {
@@ -247,15 +296,15 @@
 }
 
 // Creates "/dev/block/dm-XX" for dm-verity by running coldboot on /sys/block/dm-XX.
-bool FirstStageMount::InitVerityDevice(const std::string& verity_device) {
-    const std::string device_name(basename(verity_device.c_str()));
+bool FirstStageMount::InitMappedDevice(const std::string& dm_device) {
+    const std::string device_name(basename(dm_device.c_str()));
     const std::string syspath = "/sys/block/" + device_name;
     bool found = false;
 
-    auto verity_callback = [&device_name, &verity_device, this, &found](const Uevent& uevent) {
+    auto verity_callback = [&device_name, &dm_device, this, &found](const Uevent& uevent) {
         if (uevent.device_name == device_name) {
-            LOG(VERBOSE) << "Creating dm-verity device : " << verity_device;
-            device_handler_.HandleDeviceEvent(uevent);
+            LOG(VERBOSE) << "Creating device-mapper device : " << dm_device;
+            device_handler_->HandleDeviceEvent(uevent);
             found = true;
             return ListenerAction::kStop;
         }
@@ -279,6 +328,14 @@
 
 bool FirstStageMount::MountPartitions() {
     for (auto fstab_rec : mount_fstab_recs_) {
+        if (fs_mgr_is_logical(fstab_rec)) {
+            if (!fs_mgr_update_logical_partition(fstab_rec)) {
+                return false;
+            }
+            if (!InitMappedDevice(fstab_rec->blk_device)) {
+                return false;
+            }
+        }
         if (!SetUpDmVerity(fstab_rec)) {
             PLOG(ERROR) << "Failed to setup verity for '" << fstab_rec->mount_point << "'";
             return false;
@@ -291,7 +348,7 @@
     return true;
 }
 
-bool FirstStageMountVBootV1::GetRequiredDevices() {
+bool FirstStageMountVBootV1::GetDmVerityDevices() {
     std::string verity_loc_device;
     need_dm_verity_ = false;
 
@@ -344,7 +401,7 @@
                 // The exact block device name (fstab_rec->blk_device) is changed to
                 // "/dev/block/dm-XX". Needs to create it because ueventd isn't started in init
                 // first stage.
-                return InitVerityDevice(fstab_rec->blk_device);
+                return InitMappedDevice(fstab_rec->blk_device);
             default:
                 return false;
         }
@@ -371,7 +428,7 @@
     }
 }
 
-bool FirstStageMountVBootV2::GetRequiredDevices() {
+bool FirstStageMountVBootV2::GetDmVerityDevices() {
     need_dm_verity_ = false;
 
     // fstab_rec->blk_device has A/B suffix.
@@ -416,9 +473,8 @@
         // the content of uevent. by-name symlink will be at [0] if uevent->partition_name
         // is not empty. e.g.,
         //   - /dev/block/platform/soc.0/f9824900.sdhci/by-name/modem
-        //   - /dev/block/platform/soc.0/f9824900.sdhci/by-num/p1
         //   - /dev/block/platform/soc.0/f9824900.sdhci/mmcblk0p1
-        std::vector<std::string> links = device_handler_.GetBlockDeviceSymlinks(uevent);
+        std::vector<std::string> links = device_handler_->GetBlockDeviceSymlinks(uevent);
         if (!links.empty()) {
             auto[it, inserted] = by_name_symlink_map_.emplace(uevent.partition_name, links[0]);
             if (!inserted) {
@@ -444,7 +500,7 @@
                 // The exact block device name (fstab_rec->blk_device) is changed to
                 // "/dev/block/dm-XX". Needs to create it because ueventd isn't started in init
                 // first stage.
-                return InitVerityDevice(fstab_rec->blk_device);
+                return InitMappedDevice(fstab_rec->blk_device);
             default:
                 return false;
         }
diff --git a/init/keychords.cpp b/init/keychords.cpp
index e686ce1..418cdeb 100644
--- a/init/keychords.cpp
+++ b/init/keychords.cpp
@@ -16,66 +16,115 @@
 
 #include "keychords.h"
 
+#include <dirent.h>
 #include <fcntl.h>
-#include <stdlib.h>
-#include <sys/stat.h>
+#include <linux/input.h>
+#include <sys/cdefs.h>
+#include <sys/inotify.h>
+#include <sys/ioctl.h>
 #include <sys/types.h>
-#include <linux/keychord.h>
 #include <unistd.h>
 
+#include <algorithm>
+#include <functional>
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
 #include <android-base/logging.h>
 #include <android-base/properties.h>
 
 #include "init.h"
+#include "service.h"
 
 namespace android {
 namespace init {
 
-static struct input_keychord *keychords = 0;
-static int keychords_count = 0;
-static int keychords_length = 0;
-static int keychord_fd = -1;
+namespace {
 
-void add_service_keycodes(Service* svc)
-{
-    struct input_keychord *keychord;
-    size_t i, size;
+int keychords_count;
+Epoll* epoll;
 
-    if (!svc->keycodes().empty()) {
-        /* add a new keychord to the list */
-        size = sizeof(*keychord) + svc->keycodes().size() * sizeof(keychord->keycodes[0]);
-        keychords = (input_keychord*) realloc(keychords, keychords_length + size);
-        if (!keychords) {
-            PLOG(ERROR) << "could not allocate keychords";
-            keychords_length = 0;
-            keychords_count = 0;
-            return;
+struct KeychordEntry {
+    const std::vector<int> keycodes;
+    bool notified;
+    int id;
+
+    KeychordEntry(const std::vector<int>& keycodes, int id)
+        : keycodes(keycodes), notified(false), id(id) {}
+};
+
+std::vector<KeychordEntry> keychord_entries;
+
+// Bit management
+class KeychordMask {
+  private:
+    typedef unsigned int mask_t;
+    std::vector<mask_t> bits;
+    static constexpr size_t bits_per_byte = 8;
+
+  public:
+    explicit KeychordMask(size_t bit = 0) : bits((bit + sizeof(mask_t) - 1) / sizeof(mask_t), 0) {}
+
+    void SetBit(size_t bit, bool value = true) {
+        auto idx = bit / (bits_per_byte * sizeof(mask_t));
+        if (idx >= bits.size()) return;
+        if (value) {
+            bits[idx] |= mask_t(1) << (bit % (bits_per_byte * sizeof(mask_t)));
+        } else {
+            bits[idx] &= ~(mask_t(1) << (bit % (bits_per_byte * sizeof(mask_t))));
         }
-
-        keychord = (struct input_keychord *)((char *)keychords + keychords_length);
-        keychord->version = KEYCHORD_VERSION;
-        keychord->id = keychords_count + 1;
-        keychord->count = svc->keycodes().size();
-        svc->set_keychord_id(keychord->id);
-
-        for (i = 0; i < svc->keycodes().size(); i++) {
-            keychord->keycodes[i] = svc->keycodes()[i];
-        }
-        keychords_count++;
-        keychords_length += size;
-    }
-}
-
-static void handle_keychord() {
-    int ret;
-    __u16 id;
-
-    ret = read(keychord_fd, &id, sizeof(id));
-    if (ret != sizeof(id)) {
-        PLOG(ERROR) << "could not read keychord id";
-        return;
     }
 
+    bool GetBit(size_t bit) const {
+        auto idx = bit / (bits_per_byte * sizeof(mask_t));
+        return bits[idx] & (mask_t(1) << (bit % (bits_per_byte * sizeof(mask_t))));
+    }
+
+    size_t bytesize() const { return bits.size() * sizeof(mask_t); }
+    void* data() { return bits.data(); }
+    size_t size() const { return bits.size() * sizeof(mask_t) * bits_per_byte; }
+    void resize(size_t bit) {
+        auto idx = bit / (bits_per_byte * sizeof(mask_t));
+        if (idx >= bits.size()) {
+            bits.resize(idx + 1, 0);
+        }
+    }
+
+    operator bool() const {
+        for (size_t i = 0; i < bits.size(); ++i) {
+            if (bits[i]) return true;
+        }
+        return false;
+    }
+
+    KeychordMask operator&(const KeychordMask& rval) const {
+        auto len = std::min(bits.size(), rval.bits.size());
+        KeychordMask ret;
+        ret.bits.resize(len);
+        for (size_t i = 0; i < len; ++i) {
+            ret.bits[i] = bits[i] & rval.bits[i];
+        }
+        return ret;
+    }
+
+    void operator|=(const KeychordMask& rval) {
+        size_t len = rval.bits.size();
+        bits.resize(len);
+        for (size_t i = 0; i < len; ++i) {
+            bits[i] |= rval.bits[i];
+        }
+    }
+};
+
+KeychordMask keychord_current;
+
+constexpr char kDevicePath[] = "/dev/input";
+
+std::map<std::string, int> keychord_registration;
+
+void HandleKeychord(int id) {
     // Only handle keychords if adb is enabled.
     std::string adb_enabled = android::base::GetProperty("init.svc.adbd", "");
     if (adb_enabled == "running") {
@@ -94,32 +143,180 @@
     }
 }
 
-void keychord_init() {
+void KeychordLambdaCheck() {
+    for (auto& e : keychord_entries) {
+        bool found = true;
+        for (auto& code : e.keycodes) {
+            if (!keychord_current.GetBit(code)) {
+                e.notified = false;
+                found = false;
+                break;
+            }
+        }
+        if (!found) continue;
+        if (e.notified) continue;
+        e.notified = true;
+        HandleKeychord(e.id);
+    }
+}
+
+void KeychordLambdaHandler(int fd) {
+    input_event event;
+    auto res = TEMP_FAILURE_RETRY(::read(fd, &event, sizeof(event)));
+    if ((res != sizeof(event)) || (event.type != EV_KEY)) return;
+    keychord_current.SetBit(event.code, event.value);
+    KeychordLambdaCheck();
+}
+
+bool KeychordGeteventEnable(int fd) {
+    static bool EviocsmaskSupported = true;
+
+    // Make sure it is an event channel, should pass this ioctl call
+    int version;
+    if (::ioctl(fd, EVIOCGVERSION, &version)) return false;
+
+    if (EviocsmaskSupported) {
+        KeychordMask mask(EV_KEY);
+        mask.SetBit(EV_KEY);
+        input_mask msg = {};
+        msg.type = EV_SYN;
+        msg.codes_size = mask.bytesize();
+        msg.codes_ptr = reinterpret_cast<uintptr_t>(mask.data());
+        if (::ioctl(fd, EVIOCSMASK, &msg) == -1) {
+            PLOG(WARNING) << "EVIOCSMASK not supported";
+            EviocsmaskSupported = false;
+        }
+    }
+
+    KeychordMask mask;
+    for (auto& e : keychord_entries) {
+        for (auto& code : e.keycodes) {
+            mask.resize(code);
+            mask.SetBit(code);
+        }
+    }
+
+    keychord_current.resize(mask.size());
+    KeychordMask available(mask.size());
+    auto res = ::ioctl(fd, EVIOCGBIT(EV_KEY, available.bytesize()), available.data());
+    if (res == -1) return false;
+    if (!(available & mask)) return false;
+
+    if (EviocsmaskSupported) {
+        input_mask msg = {};
+        msg.type = EV_KEY;
+        msg.codes_size = mask.bytesize();
+        msg.codes_ptr = reinterpret_cast<uintptr_t>(mask.data());
+        ::ioctl(fd, EVIOCSMASK, &msg);
+    }
+
+    KeychordMask set(mask.size());
+    res = ::ioctl(fd, EVIOCGKEY(res), set.data());
+    if (res > 0) {
+        keychord_current |= mask & available & set;
+        KeychordLambdaCheck();
+    }
+    epoll->RegisterHandler(fd, [fd]() { KeychordLambdaHandler(fd); });
+    return true;
+}
+
+void GeteventOpenDevice(const std::string& device) {
+    if (keychord_registration.count(device)) return;
+    auto fd = TEMP_FAILURE_RETRY(::open(device.c_str(), O_RDWR | O_CLOEXEC));
+    if (fd == -1) {
+        PLOG(ERROR) << "Can not open " << device;
+        return;
+    }
+    if (!KeychordGeteventEnable(fd)) {
+        ::close(fd);
+    } else {
+        keychord_registration.emplace(device, fd);
+    }
+}
+
+void GeteventCloseDevice(const std::string& device) {
+    auto it = keychord_registration.find(device);
+    if (it == keychord_registration.end()) return;
+    auto fd = (*it).second;
+    epoll->UnregisterHandler(fd);
+    keychord_registration.erase(it);
+    ::close(fd);
+}
+
+int inotify_fd = -1;
+
+void InotifyHandler() {
+    unsigned char buf[512];
+
+    auto res = TEMP_FAILURE_RETRY(::read(inotify_fd, buf, sizeof(buf)));
+    if (res < 0) {
+        PLOG(WARNING) << "could not get event";
+        return;
+    }
+
+    auto event_buf = buf;
+    while (static_cast<size_t>(res) >= sizeof(inotify_event)) {
+        auto event = reinterpret_cast<inotify_event*>(event_buf);
+        auto event_size = sizeof(inotify_event) + event->len;
+        if (static_cast<size_t>(res) < event_size) break;
+        if (event->len) {
+            std::string devname(kDevicePath);
+            devname += '/';
+            devname += event->name;
+            if (event->mask & IN_CREATE) {
+                GeteventOpenDevice(devname);
+            } else {
+                GeteventCloseDevice(devname);
+            }
+        }
+        res -= event_size;
+        event_buf += event_size;
+    }
+}
+
+void GeteventOpenDevice() {
+    inotify_fd = ::inotify_init1(IN_NONBLOCK | IN_CLOEXEC);
+    if (inotify_fd < 0) {
+        PLOG(WARNING) << "Could not instantiate inotify for " << kDevicePath;
+    } else if (::inotify_add_watch(inotify_fd, kDevicePath, IN_DELETE | IN_CREATE | IN_ONLYDIR) < 0) {
+        PLOG(WARNING) << "Could not add watch for " << kDevicePath;
+        ::close(inotify_fd);
+        inotify_fd = -1;
+    }
+
+    std::unique_ptr<DIR, decltype(&closedir)> device(opendir(kDevicePath), closedir);
+    if (device) {
+        dirent* entry;
+        while ((entry = readdir(device.get()))) {
+            if (entry->d_name[0] == '.') continue;
+            std::string devname(kDevicePath);
+            devname += '/';
+            devname += entry->d_name;
+            GeteventOpenDevice(devname);
+        }
+    }
+
+    if (inotify_fd >= 0) epoll->RegisterHandler(inotify_fd, InotifyHandler);
+}
+
+void AddServiceKeycodes(Service* svc) {
+    if (svc->keycodes().empty()) return;
+    for (auto& code : svc->keycodes()) {
+        if ((code < 0) || (code >= KEY_MAX)) return;
+    }
+    ++keychords_count;
+    keychord_entries.emplace_back(KeychordEntry(svc->keycodes(), keychords_count));
+    svc->set_keychord_id(keychords_count);
+}
+
+}  // namespace
+
+void KeychordInit(Epoll* init_epoll) {
+    epoll = init_epoll;
     for (const auto& service : ServiceList::GetInstance()) {
-        add_service_keycodes(service.get());
+        AddServiceKeycodes(service.get());
     }
-
-    // Nothing to do if no services require keychords.
-    if (!keychords) {
-        return;
-    }
-
-    keychord_fd = TEMP_FAILURE_RETRY(open("/dev/keychord", O_RDWR | O_CLOEXEC));
-    if (keychord_fd == -1) {
-        PLOG(ERROR) << "could not open /dev/keychord";
-        return;
-    }
-
-    int ret = write(keychord_fd, keychords, keychords_length);
-    if (ret != keychords_length) {
-        PLOG(ERROR) << "could not configure /dev/keychord " << ret;
-        close(keychord_fd);
-    }
-
-    free(keychords);
-    keychords = nullptr;
-
-    register_epoll_handler(keychord_fd, handle_keychord);
+    if (keychords_count) GeteventOpenDevice();
 }
 
 }  // namespace init
diff --git a/init/keychords.h b/init/keychords.h
index 1c34098..f3aecbb 100644
--- a/init/keychords.h
+++ b/init/keychords.h
@@ -17,13 +17,12 @@
 #ifndef _INIT_KEYCHORDS_H_
 #define _INIT_KEYCHORDS_H_
 
-#include "service.h"
+#include "epoll.h"
 
 namespace android {
 namespace init {
 
-void add_service_keycodes(Service* svc);
-void keychord_init();
+void KeychordInit(Epoll* init_epoll);
 
 }  // namespace init
 }  // namespace android
diff --git a/init/property_service.cpp b/init/property_service.cpp
index 99d3c83..741fde0 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -56,15 +56,16 @@
 #include <selinux/label.h>
 #include <selinux/selinux.h>
 
+#include "epoll.h"
 #include "init.h"
 #include "persistent_properties.h"
 #include "property_type.h"
+#include "selinux.h"
 #include "subcontext.h"
 #include "util.h"
 
 using namespace std::literals;
 
-using android::base::GetIntProperty;
 using android::base::ReadFileToString;
 using android::base::Split;
 using android::base::StartsWith;
@@ -371,6 +372,7 @@
 
             int result = TEMP_FAILURE_RETRY(recv(socket_, data, bytes_left, MSG_DONTWAIT));
             if (result <= 0) {
+                PLOG(ERROR) << "sys_prop: recv error";
                 return false;
             }
 
@@ -378,6 +380,10 @@
             data += result;
         }
 
+        if (bytes_left != 0) {
+            LOG(ERROR) << "sys_prop: recv data is not properly obtained.";
+        }
+
         return bytes_left == 0;
     }
 
@@ -542,7 +548,7 @@
     size_t flen = 0;
 
     const char* context = kInitContext.c_str();
-    if (GetIntProperty("ro.vndk.version", 28) >= 28) {
+    if (SelinuxHasVendorInit()) {
         for (const auto& [path_prefix, secontext] : paths_and_secontexts) {
             if (StartsWith(filename, path_prefix)) {
                 context = secontext;
@@ -808,7 +814,7 @@
     selinux_android_restorecon(kPropertyInfosPath, 0);
 }
 
-void start_property_service() {
+void StartPropertyService(Epoll* epoll) {
     selinux_callback cb;
     cb.func_audit = SelinuxAuditCallback;
     selinux_set_callback(SELINUX_CB_AUDIT, cb);
@@ -823,7 +829,9 @@
 
     listen(property_set_fd, 8);
 
-    register_epoll_handler(property_set_fd, handle_property_set_fd);
+    if (auto result = epoll->RegisterHandler(property_set_fd, handle_property_set_fd); !result) {
+        PLOG(FATAL) << result.error();
+    }
 }
 
 }  // namespace init
diff --git a/init/property_service.h b/init/property_service.h
index 29eaaa9..4a354c2 100644
--- a/init/property_service.h
+++ b/init/property_service.h
@@ -21,6 +21,8 @@
 
 #include <string>
 
+#include "epoll.h"
+
 namespace android {
 namespace init {
 
@@ -40,7 +42,7 @@
 void property_load_boot_defaults(void);
 void load_persist_props(void);
 void load_system_props(void);
-void start_property_service(void);
+void StartPropertyService(Epoll* epoll);
 
 }  // namespace init
 }  // namespace android
diff --git a/init/selinux.cpp b/init/selinux.cpp
index 6aba9c1..0ba5c4a 100644
--- a/init/selinux.cpp
+++ b/init/selinux.cpp
@@ -55,12 +55,14 @@
 #include <android-base/chrono_utils.h>
 #include <android-base/file.h>
 #include <android-base/logging.h>
+#include <android-base/parseint.h>
 #include <android-base/unique_fd.h>
 #include <selinux/android.h>
 
 #include "log.h"
 #include "util.h"
 
+using android::base::ParseInt;
 using android::base::Timer;
 using android::base::unique_fd;
 
@@ -453,6 +455,31 @@
     selinux_set_callback(SELINUX_CB_LOG, cb);
 }
 
+// This function checks whether the sepolicy supports vendor init.
+bool SelinuxHasVendorInit() {
+    if (!IsSplitPolicyDevice()) {
+        // If this device does not split sepolicy files, vendor_init will be available in the latest
+        // monolithic sepolicy file.
+        return true;
+    }
+
+    std::string version;
+    if (!GetVendorMappingVersion(&version)) {
+        // Return true as the default if we failed to load the vendor sepolicy version.
+        return true;
+    }
+
+    int major_version;
+    std::string major_version_str(version, 0, version.find('.'));
+    if (!ParseInt(major_version_str, &major_version)) {
+        PLOG(ERROR) << "Failed to parse the vendor sepolicy major version " << major_version_str;
+        // Return true as the default if we failed to parse the major version.
+        return true;
+    }
+
+    return major_version >= 28;
+}
+
 // selinux_android_file_context_handle() takes on the order of 10+ms to run, so we want to cache
 // its value.  selinux_android_restorecon() also needs an sehandle for file context look up.  It
 // will create and store its own copy, but selinux_android_set_sehandle() can be used to provide
diff --git a/init/selinux.h b/init/selinux.h
index 7b880ec..30069b5 100644
--- a/init/selinux.h
+++ b/init/selinux.h
@@ -27,6 +27,7 @@
 void SelinuxRestoreContext();
 
 void SelinuxSetupKernelLogging();
+bool SelinuxHasVendorInit();
 
 void SelabelInitialize();
 bool SelabelLookupFileContext(const std::string& key, int type, std::string* result);
diff --git a/init/service.cpp b/init/service.cpp
index 03c2cee..0e08d9b 100644
--- a/init/service.cpp
+++ b/init/service.cpp
@@ -34,6 +34,7 @@
 #include <android-base/parseint.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
+#include <android-base/unique_fd.h>
 #include <hidl-util/FQName.h>
 #include <processgroup/processgroup.h>
 #include <selinux/selinux.h>
@@ -59,13 +60,13 @@
 using android::base::ParseInt;
 using android::base::StartsWith;
 using android::base::StringPrintf;
+using android::base::unique_fd;
 using android::base::WriteStringToFile;
 
 namespace android {
 namespace init {
 
-static Result<std::string> ComputeContextFromExecutable(std::string& service_name,
-                                                        const std::string& service_path) {
+static Result<std::string> ComputeContextFromExecutable(const std::string& service_path) {
     std::string computed_context;
 
     char* raw_con = nullptr;
@@ -101,36 +102,49 @@
     return computed_context;
 }
 
-static void SetUpPidNamespace(const std::string& service_name) {
+Result<Success> Service::SetUpMountNamespace() const {
     constexpr unsigned int kSafeFlags = MS_NODEV | MS_NOEXEC | MS_NOSUID;
 
-    // It's OK to LOG(FATAL) in this function since it's running in the first
-    // child process.
-
     // Recursively remount / as slave like zygote does so unmounting and mounting /proc
     // doesn't interfere with the parent namespace's /proc mount. This will also
     // prevent any other mounts/unmounts initiated by the service from interfering
     // with the parent namespace but will still allow mount events from the parent
     // namespace to propagate to the child.
     if (mount("rootfs", "/", nullptr, (MS_SLAVE | MS_REC), nullptr) == -1) {
-        PLOG(FATAL) << "couldn't remount(/) recursively as slave for " << service_name;
-    }
-    // umount() then mount() /proc.
-    // Note that it is not sufficient to mount with MS_REMOUNT.
-    if (umount("/proc") == -1) {
-        PLOG(FATAL) << "couldn't umount(/proc) for " << service_name;
-    }
-    if (mount("", "/proc", "proc", kSafeFlags, "") == -1) {
-        PLOG(FATAL) << "couldn't mount(/proc) for " << service_name;
+        return ErrnoError() << "Could not remount(/) recursively as slave";
     }
 
-    if (prctl(PR_SET_NAME, service_name.c_str()) == -1) {
-        PLOG(FATAL) << "couldn't set name for " << service_name;
+    // umount() then mount() /proc and/or /sys
+    // Note that it is not sufficient to mount with MS_REMOUNT.
+    if (namespace_flags_ & CLONE_NEWPID) {
+        if (umount("/proc") == -1) {
+            return ErrnoError() << "Could not umount(/proc)";
+        }
+        if (mount("", "/proc", "proc", kSafeFlags, "") == -1) {
+            return ErrnoError() << "Could not mount(/proc)";
+        }
+    }
+    bool remount_sys = std::any_of(namespaces_to_enter_.begin(), namespaces_to_enter_.end(),
+                                   [](const auto& entry) { return entry.first == CLONE_NEWNET; });
+    if (remount_sys) {
+        if (umount2("/sys", MNT_DETACH) == -1) {
+            return ErrnoError() << "Could not umount(/sys)";
+        }
+        if (mount("", "/sys", "sys", kSafeFlags, "") == -1) {
+            return ErrnoError() << "Could not mount(/sys)";
+        }
+    }
+    return Success();
+}
+
+Result<Success> Service::SetUpPidNamespace() const {
+    if (prctl(PR_SET_NAME, name_.c_str()) == -1) {
+        return ErrnoError() << "Could not set name";
     }
 
     pid_t child_pid = fork();
     if (child_pid == -1) {
-        PLOG(FATAL) << "couldn't fork init inside the PID namespace for " << service_name;
+        return ErrnoError() << "Could not fork init inside the PID namespace";
     }
 
     if (child_pid > 0) {
@@ -153,6 +167,20 @@
         }
         _exit(WEXITSTATUS(init_exitstatus));
     }
+    return Success();
+}
+
+Result<Success> Service::EnterNamespaces() const {
+    for (const auto& [nstype, path] : namespaces_to_enter_) {
+        auto fd = unique_fd{open(path.c_str(), O_RDONLY | O_CLOEXEC)};
+        if (!fd) {
+            return ErrnoError() << "Could not open namespace at " << path;
+        }
+        if (setns(fd, nstype) == -1) {
+            return ErrnoError() << "Could not setns() namespace at " << path;
+        }
+    }
+    return Success();
 }
 
 static bool ExpandArgsAndExecv(const std::vector<std::string>& args, bool sigstop) {
@@ -422,6 +450,20 @@
     return Success();
 }
 
+Result<Success> Service::ParseEnterNamespace(const std::vector<std::string>& args) {
+    if (args[1] != "net") {
+        return Error() << "Init only supports entering network namespaces";
+    }
+    if (!namespaces_to_enter_.empty()) {
+        return Error() << "Only one network namespace may be entered";
+    }
+    // Network namespaces require that /sys is remounted, otherwise the old adapters will still be
+    // present. Therefore, they also require mount namespaces.
+    namespace_flags_ |= CLONE_NEWNS;
+    namespaces_to_enter_.emplace_back(CLONE_NEWNET, args[2]);
+    return Success();
+}
+
 Result<Success> Service::ParseGroup(const std::vector<std::string>& args) {
     auto gid = DecodeUid(args[1]);
     if (!gid) {
@@ -691,6 +733,8 @@
         {"console",     {0,     1,    &Service::ParseConsole}},
         {"critical",    {0,     0,    &Service::ParseCritical}},
         {"disabled",    {0,     0,    &Service::ParseDisabled}},
+        {"enter_namespace",
+                        {2,     2,    &Service::ParseEnterNamespace}},
         {"file",        {2,     2,    &Service::ParseFile}},
         {"group",       {1,     NR_SVC_SUPP_GIDS + 1, &Service::ParseGroup}},
         {"interface",   {2,     2,    &Service::ParseInterface}},
@@ -793,7 +837,7 @@
     if (!seclabel_.empty()) {
         scon = seclabel_;
     } else {
-        auto result = ComputeContextFromExecutable(name_, args_[0]);
+        auto result = ComputeContextFromExecutable(args_[0]);
         if (!result) {
             return result.error();
         }
@@ -812,10 +856,24 @@
     if (pid == 0) {
         umask(077);
 
+        if (auto result = EnterNamespaces(); !result) {
+            LOG(FATAL) << "Service '" << name_ << "' could not enter namespaces: " << result.error();
+        }
+
+        if (namespace_flags_ & CLONE_NEWNS) {
+            if (auto result = SetUpMountNamespace(); !result) {
+                LOG(FATAL) << "Service '" << name_
+                           << "' could not set up mount namespace: " << result.error();
+            }
+        }
+
         if (namespace_flags_ & CLONE_NEWPID) {
             // This will fork again to run an init process inside the PID
             // namespace.
-            SetUpPidNamespace(name_);
+            if (auto result = SetUpPidNamespace(); !result) {
+                LOG(FATAL) << "Service '" << name_
+                           << "' could not set up PID namespace: " << result.error();
+            }
         }
 
         for (const auto& [key, value] : environment_vars_) {
diff --git a/init/service.h b/init/service.h
index cf38f69..cbfd52f 100644
--- a/init/service.h
+++ b/init/service.h
@@ -125,6 +125,9 @@
     using OptionParser = Result<Success> (Service::*)(const std::vector<std::string>& args);
     class OptionParserMap;
 
+    Result<Success> SetUpMountNamespace() const;
+    Result<Success> SetUpPidNamespace() const;
+    Result<Success> EnterNamespaces() const;
     void NotifyStateChange(const std::string& new_state) const;
     void StopOrReset(int how);
     void ZapStdio() const;
@@ -137,6 +140,7 @@
     Result<Success> ParseConsole(const std::vector<std::string>& args);
     Result<Success> ParseCritical(const std::vector<std::string>& args);
     Result<Success> ParseDisabled(const std::vector<std::string>& args);
+    Result<Success> ParseEnterNamespace(const std::vector<std::string>& args);
     Result<Success> ParseGroup(const std::vector<std::string>& args);
     Result<Success> ParsePriority(const std::vector<std::string>& args);
     Result<Success> ParseInterface(const std::vector<std::string>& args);
@@ -181,6 +185,8 @@
     std::vector<gid_t> supp_gids_;
     CapSet capabilities_;
     unsigned namespace_flags_;
+    // Pair of namespace type, path to namespace.
+    std::vector<std::pair<int, std::string>> namespaces_to_enter_;
 
     std::string seclabel_;
 
@@ -244,6 +250,16 @@
         return nullptr;
     }
 
+    Service* FindInterface(const std::string& interface_name) {
+        for (const auto& svc : services_) {
+            if (svc->interfaces().count(interface_name) > 0) {
+                return svc.get();
+            }
+        }
+
+        return nullptr;
+    }
+
     void DumpState() const;
 
     auto begin() const { return services_.begin(); }
diff --git a/init/subcontext.cpp b/init/subcontext.cpp
index 9c0c0bb..267d530 100644
--- a/init/subcontext.cpp
+++ b/init/subcontext.cpp
@@ -30,8 +30,6 @@
 #include "util.h"
 
 #if defined(__ANDROID__)
-#include <android-base/properties.h>
-
 #include "property_service.h"
 #include "selinux.h"
 #else
@@ -39,7 +37,6 @@
 #endif
 
 using android::base::GetExecutablePath;
-using android::base::GetIntProperty;
 using android::base::Join;
 using android::base::Socketpair;
 using android::base::Split;
@@ -357,7 +354,7 @@
 static std::vector<Subcontext> subcontexts;
 
 std::vector<Subcontext>* InitializeSubcontexts() {
-    if (GetIntProperty("ro.vndk.version", 28) >= 28) {
+    if (SelinuxHasVendorInit()) {
         for (const auto& [path_prefix, secontext] : paths_and_secontexts) {
             subcontexts.emplace_back(path_prefix, secontext);
         }
diff --git a/init/ueventd.cpp b/init/ueventd.cpp
index 1435d82..a284203 100644
--- a/init/ueventd.cpp
+++ b/init/ueventd.cpp
@@ -30,6 +30,7 @@
 #include <android-base/chrono_utils.h>
 #include <android-base/logging.h>
 #include <android-base/properties.h>
+#include <fstab/fstab.h>
 #include <selinux/android.h>
 #include <selinux/selinux.h>
 
@@ -242,8 +243,9 @@
     std::string hardware = android::base::GetProperty("ro.hardware", "");
     parser.ParseConfig("/ueventd." + hardware + ".rc");
 
+    auto boot_devices = fs_mgr_get_boot_devices();
     return DeviceHandler(std::move(dev_permissions), std::move(sysfs_permissions),
-                         std::move(subsystems), true);
+                         std::move(subsystems), std::move(boot_devices), true);
 }
 
 int ueventd_main(int argc, char** argv) {
diff --git a/libbacktrace/Android.bp b/libbacktrace/Android.bp
index 11b8144..0f93dd0 100644
--- a/libbacktrace/Android.bp
+++ b/libbacktrace/Android.bp
@@ -51,6 +51,7 @@
 cc_library_headers {
     name: "libbacktrace_headers",
     vendor_available: true,
+    recovery_available: true,
     export_include_dirs: ["include"],
 }
 
@@ -91,7 +92,10 @@
                 "libdexfile",
             ],
 
-            static_libs: ["libcutils"],
+            static_libs: [
+                "libcutils",
+                "libprocinfo",
+            ],
 
             // libdexfile will eventually properly export headers, for now
             // include these directly.
diff --git a/libbacktrace/BacktraceMap.cpp b/libbacktrace/BacktraceMap.cpp
index bdae140..399721d 100644
--- a/libbacktrace/BacktraceMap.cpp
+++ b/libbacktrace/BacktraceMap.cpp
@@ -28,6 +28,9 @@
 #include <backtrace/Backtrace.h>
 #include <backtrace/BacktraceMap.h>
 #include <backtrace/backtrace_constants.h>
+#if defined(__linux__)
+#include <procinfo/process_map.h>
+#endif
 
 #include "thread_utils.h"
 
@@ -60,27 +63,19 @@
   *map = {};
 }
 
-bool BacktraceMap::ParseLine(const char* line, backtrace_map_t* map) {
+#if defined(__APPLE__)
+static bool ParseLine(const char* line, backtrace_map_t* map) {
   uint64_t start;
   uint64_t end;
   char permissions[5];
   int name_pos;
 
-#if defined(__APPLE__)
 // Mac OS vmmap(1) output:
 // __TEXT                 0009f000-000a1000 [    8K     8K] r-x/rwx SM=COW  /Volumes/android/dalvik-dev/out/host/darwin-x86/bin/libcorkscrew_test\n
 // 012345678901234567890123456789012345678901234567890123456789
 // 0         1         2         3         4         5
   if (sscanf(line, "%*21c %" SCNx64 "-%" SCNx64 " [%*13c] %3c/%*3c SM=%*3c  %n",
              &start, &end, permissions, &name_pos) != 3) {
-#else
-// Linux /proc/<pid>/maps lines:
-// 6f000000-6f01e000 rwxp 00000000 00:0c 16389419   /system/lib/libcomposer.so\n
-// 012345678901234567890123456789012345678901234567890123456789
-// 0         1         2         3         4         5
-  if (sscanf(line, "%" SCNx64 "-%" SCNx64 " %4s %*x %*x:%*x %*d %n",
-             &start, &end, permissions, &name_pos) != 3) {
-#endif
     return false;
   }
 
@@ -107,24 +102,15 @@
         map->flags, map->name.c_str());
   return true;
 }
+#endif  // defined(__APPLE__)
 
 bool BacktraceMap::Build() {
 #if defined(__APPLE__)
   char cmd[sizeof(pid_t)*3 + sizeof("vmmap -w -resident -submap -allSplitLibs -interleaved ") + 1];
-#else
-  char path[sizeof(pid_t)*3 + sizeof("/proc//maps") + 1];
-#endif
   char line[1024];
-
-#if defined(__APPLE__)
   // cmd is guaranteed to always be big enough to hold this string.
   snprintf(cmd, sizeof(cmd), "vmmap -w -resident -submap -allSplitLibs -interleaved %d", pid_);
   FILE* fp = popen(cmd, "r");
-#else
-  // path is guaranteed to always be big enough to hold this string.
-  snprintf(path, sizeof(path), "/proc/%d/maps", pid_);
-  FILE* fp = fopen(path, "r");
-#endif
   if (fp == nullptr) {
     return false;
   }
@@ -135,13 +121,19 @@
       maps_.push_back(map);
     }
   }
-#if defined(__APPLE__)
   pclose(fp);
-#else
-  fclose(fp);
-#endif
-
   return true;
+#else
+  return android::procinfo::ReadProcessMaps(
+      pid_, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t, const char* name) {
+        maps_.resize(maps_.size() + 1);
+        backtrace_map_t& map = maps_.back();
+        map.start = start;
+        map.end = end;
+        map.flags = flags;
+        map.name = name;
+      });
+#endif
 }
 
 #if defined(__APPLE__)
diff --git a/libbacktrace/include/backtrace/BacktraceMap.h b/libbacktrace/include/backtrace/BacktraceMap.h
index c94cad1..a9cfce4 100644
--- a/libbacktrace/include/backtrace/BacktraceMap.h
+++ b/libbacktrace/include/backtrace/BacktraceMap.h
@@ -169,8 +169,6 @@
 
   virtual uint64_t GetLoadBias(size_t /* index */) { return 0; }
 
-  virtual bool ParseLine(const char* line, backtrace_map_t* map);
-
   pid_t pid_;
   std::deque<backtrace_map_t> maps_;
   std::vector<std::string> suffixes_to_ignore_;
diff --git a/libcutils/Android.bp b/libcutils/Android.bp
index dd46750..cdbb65f 100644
--- a/libcutils/Android.bp
+++ b/libcutils/Android.bp
@@ -32,6 +32,7 @@
 cc_library_headers {
     name: "libcutils_headers",
     vendor_available: true,
+    recovery_available: true,
     host_supported: true,
     export_include_dirs: ["include"],
     target: {
@@ -54,6 +55,7 @@
         enabled: true,
         support_system_process: true,
     },
+    recovery_available: true,
     host_supported: true,
     srcs: [
         "config_utils.cpp",
@@ -160,6 +162,15 @@
                 misc_undefined: ["integer"],
             },
         },
+
+        vendor: {
+            exclude_srcs: [
+                // qtaguid.cpp loads libnetd_client.so with dlopen().  Since
+                // the interface of libnetd_client.so may vary between AOSP
+                // releases, exclude qtaguid.cpp from the VNDK-SP variant.
+                "qtaguid.cpp",
+            ],
+        }
     },
 
     shared_libs: ["liblog"],
diff --git a/libcutils/ashmem-host.cpp b/libcutils/ashmem-host.cpp
index b2bec99..bb990d5 100644
--- a/libcutils/ashmem-host.cpp
+++ b/libcutils/ashmem-host.cpp
@@ -24,7 +24,6 @@
 #include <errno.h>
 #include <fcntl.h>
 #include <limits.h>
-#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/libcutils/canned_fs_config.cpp b/libcutils/canned_fs_config.cpp
index 6b5763b..2772ef0 100644
--- a/libcutils/canned_fs_config.cpp
+++ b/libcutils/canned_fs_config.cpp
@@ -21,7 +21,6 @@
 #include <errno.h>
 #include <inttypes.h>
 #include <limits.h>
-#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
diff --git a/libcutils/hashmap.cpp b/libcutils/hashmap.cpp
index 65b6ab1..10e3b25 100644
--- a/libcutils/hashmap.cpp
+++ b/libcutils/hashmap.cpp
@@ -21,7 +21,6 @@
 #include <cutils/threads.h>
 #include <stdlib.h>
 #include <string.h>
-#include <stdbool.h>
 #include <sys/types.h>
 
 typedef struct Entry Entry;
diff --git a/libcutils/trace-dev.inc b/libcutils/trace-dev.inc
index f95c6c5..c9580af 100644
--- a/libcutils/trace-dev.inc
+++ b/libcutils/trace-dev.inc
@@ -24,7 +24,6 @@
 #include <limits.h>
 #include <pthread.h>
 #include <stdatomic.h>
-#include <stdbool.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>
diff --git a/liblog/Android.bp b/liblog/Android.bp
index 7d9e306..2d5a5db 100644
--- a/liblog/Android.bp
+++ b/liblog/Android.bp
@@ -46,6 +46,7 @@
     name: "liblog_headers",
     host_supported: true,
     vendor_available: true,
+    recovery_available: true,
     export_include_dirs: ["include"],
     target: {
         windows: {
@@ -65,7 +66,7 @@
 cc_library {
     name: "liblog",
     host_supported: true,
-
+    recovery_available: true,
     srcs: liblog_sources,
 
     target: {
diff --git a/liblog/logprint.c b/liblog/logprint.c
index a2839bf..7937cb1 100644
--- a/liblog/logprint.c
+++ b/liblog/logprint.c
@@ -1632,8 +1632,10 @@
     prefixLen = snprintf(prefixBuf, sizeof(prefixBuf), "\x1B[38;5;%dm",
                          colorFromPri(entry->priority));
     prefixLen = MIN(prefixLen, sizeof(prefixBuf));
-    suffixLen = snprintf(suffixBuf, sizeof(suffixBuf), "\x1B[0m");
-    suffixLen = MIN(suffixLen, sizeof(suffixBuf));
+
+    const char suffixContents[] = "\x1B[0m";
+    strcpy(suffixBuf, suffixContents);
+    suffixLen = strlen(suffixContents);
   }
 
   char uid[16];
diff --git a/libmemunreachable/Android.bp b/libmemunreachable/Android.bp
index f164a19..248a9d2 100644
--- a/libmemunreachable/Android.bp
+++ b/libmemunreachable/Android.bp
@@ -29,7 +29,6 @@
         "HeapWalker.cpp",
         "LeakFolding.cpp",
         "LeakPipe.cpp",
-        "LineBuffer.cpp",
         "MemUnreachable.cpp",
         "ProcessMappings.cpp",
         "PtracerThread.cpp",
@@ -38,6 +37,7 @@
 
     static_libs: [
         "libc_malloc_debug_backtrace",
+        "libprocinfo",
     ],
     // Only need this for arm since libc++ uses its own unwind code that
     // doesn't mix with the other default unwind code.
diff --git a/libmemunreachable/LineBuffer.cpp b/libmemunreachable/LineBuffer.cpp
deleted file mode 100644
index 4ea0542..0000000
--- a/libmemunreachable/LineBuffer.cpp
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-// Copied from system/extras/memory_replay/LineBuffer.cpp
-// TODO(ccross): find a way to share between libmemunreachable and memory_replay?
-
-#include <errno.h>
-#include <string.h>
-#include <unistd.h>
-
-#include "LineBuffer.h"
-
-namespace android {
-
-LineBuffer::LineBuffer(int fd, char* buffer, size_t buffer_len)
-    : fd_(fd), buffer_(buffer), buffer_len_(buffer_len) {}
-
-bool LineBuffer::GetLine(char** line, size_t* line_len) {
-  while (true) {
-    if (bytes_ > 0) {
-      char* newline = reinterpret_cast<char*>(memchr(buffer_ + start_, '\n', bytes_));
-      if (newline != nullptr) {
-        *newline = '\0';
-        *line = buffer_ + start_;
-        start_ = newline - buffer_ + 1;
-        bytes_ -= newline - *line + 1;
-        *line_len = newline - *line;
-        return true;
-      }
-    }
-    if (start_ > 0) {
-      // Didn't find anything, copy the current to the front of the buffer.
-      memmove(buffer_, buffer_ + start_, bytes_);
-      start_ = 0;
-    }
-    ssize_t bytes = TEMP_FAILURE_RETRY(read(fd_, buffer_ + bytes_, buffer_len_ - bytes_ - 1));
-    if (bytes <= 0) {
-      if (bytes_ > 0) {
-        // The read data might not contain a nul terminator, so add one.
-        buffer_[bytes_] = '\0';
-        *line = buffer_ + start_;
-        *line_len = bytes_;
-        bytes_ = 0;
-        start_ = 0;
-        return true;
-      }
-      return false;
-    }
-    bytes_ += bytes;
-  }
-}
-
-}  // namespace android
diff --git a/libmemunreachable/LineBuffer.h b/libmemunreachable/LineBuffer.h
deleted file mode 100644
index cc6cd0c..0000000
--- a/libmemunreachable/LineBuffer.h
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright (C) 2015 The Android Open Source Project
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#ifndef _LIBMEMUNREACHABLE_LINE_BUFFER_H
-#define _LIBMEMUNREACHABLE_LINE_BUFFER_H
-
-#include <stdint.h>
-
-namespace android {
-
-class LineBuffer {
- public:
-  LineBuffer(int fd, char* buffer, size_t buffer_len);
-
-  bool GetLine(char** line, size_t* line_len);
-
- private:
-  int fd_;
-  char* buffer_ = nullptr;
-  size_t buffer_len_ = 0;
-  size_t start_ = 0;
-  size_t bytes_ = 0;
-};
-
-}  // namespace android
-
-#endif  // _LIBMEMUNREACHABLE_LINE_BUFFER_H
diff --git a/libmemunreachable/MemUnreachable.cpp b/libmemunreachable/MemUnreachable.cpp
index 24fdc7f..529a043 100644
--- a/libmemunreachable/MemUnreachable.cpp
+++ b/libmemunreachable/MemUnreachable.cpp
@@ -495,6 +495,21 @@
   return oss.str();
 }
 
+UnreachableMemoryInfo::~UnreachableMemoryInfo() {
+  // Clear the memory that holds the leaks, otherwise the next attempt to
+  // detect leaks may find the old data (for example in the jemalloc tcache)
+  // and consider all the leaks to be referenced.
+  memset(leaks.data(), 0, leaks.capacity() * sizeof(Leak));
+
+  std::vector<Leak> tmp;
+  leaks.swap(tmp);
+
+  // Disable and re-enable malloc to flush the jemalloc tcache to make sure
+  // there are no copies of the leaked pointer addresses there.
+  malloc_disable();
+  malloc_enable();
+}
+
 std::string GetUnreachableMemoryString(bool log_contents, size_t limit) {
   UnreachableMemoryInfo info;
   if (!GetUnreachableMemory(info, limit)) {
diff --git a/libmemunreachable/ProcessMappings.cpp b/libmemunreachable/ProcessMappings.cpp
index 9a06870..701ce16 100644
--- a/libmemunreachable/ProcessMappings.cpp
+++ b/libmemunreachable/ProcessMappings.cpp
@@ -14,21 +14,30 @@
  * limitations under the License.
  */
 
+#include <errno.h>
 #include <fcntl.h>
 #include <inttypes.h>
 #include <string.h>
 #include <unistd.h>
 
 #include <android-base/unique_fd.h>
+#include <procinfo/process_map.h>
 
-#include "LineBuffer.h"
 #include "ProcessMappings.h"
-#include "log.h"
 
 namespace android {
 
-// This function is not re-entrant since it uses a static buffer for
-// the line data.
+struct ReadMapCallback {
+  ReadMapCallback(allocator::vector<Mapping>& mappings) : mappings_(mappings) {}
+
+  void operator()(uint64_t start, uint64_t end, uint16_t flags, uint64_t, const char* name) const {
+    mappings_.emplace_back(start, end, flags & PROT_READ, flags & PROT_WRITE, flags & PROT_EXEC,
+                           name);
+  }
+
+  allocator::vector<Mapping>& mappings_;
+};
+
 bool ProcessMappings(pid_t pid, allocator::vector<Mapping>& mappings) {
   char map_buffer[1024];
   snprintf(map_buffer, sizeof(map_buffer), "/proc/%d/maps", pid);
@@ -36,35 +45,13 @@
   if (fd == -1) {
     return false;
   }
-
-  LineBuffer line_buf(fd, map_buffer, sizeof(map_buffer));
-  char* line;
-  size_t line_len;
-  while (line_buf.GetLine(&line, &line_len)) {
-    int name_pos;
-    char perms[5];
-    Mapping mapping{};
-    if (sscanf(line, "%" SCNxPTR "-%" SCNxPTR " %4s %*x %*x:%*x %*d %n", &mapping.begin,
-               &mapping.end, perms, &name_pos) == 3) {
-      if (perms[0] == 'r') {
-        mapping.read = true;
-      }
-      if (perms[1] == 'w') {
-        mapping.write = true;
-      }
-      if (perms[2] == 'x') {
-        mapping.execute = true;
-      }
-      if (perms[3] == 'p') {
-        mapping.priv = true;
-      }
-      if ((size_t)name_pos < line_len) {
-        strlcpy(mapping.name, line + name_pos, sizeof(mapping.name));
-      }
-      mappings.emplace_back(mapping);
-    }
+  allocator::string content(mappings.get_allocator());
+  ssize_t n;
+  while ((n = TEMP_FAILURE_RETRY(read(fd, map_buffer, sizeof(map_buffer)))) > 0) {
+    content.append(map_buffer, n);
   }
-  return true;
+  ReadMapCallback callback(mappings);
+  return android::procinfo::ReadMapFileContent(&content[0], callback);
 }
 
 }  // namespace android
diff --git a/libmemunreachable/ProcessMappings.h b/libmemunreachable/ProcessMappings.h
index a0e97e9..94da69b 100644
--- a/libmemunreachable/ProcessMappings.h
+++ b/libmemunreachable/ProcessMappings.h
@@ -17,6 +17,8 @@
 #ifndef LIBMEMUNREACHABLE_PROCESS_MAPPING_H_
 #define LIBMEMUNREACHABLE_PROCESS_MAPPING_H_
 
+#include <string.h>
+
 #include "Allocator.h"
 
 namespace android {
@@ -27,8 +29,13 @@
   bool read;
   bool write;
   bool execute;
-  bool priv;
   char name[96];
+
+  Mapping() {}
+  Mapping(uintptr_t begin, uintptr_t end, bool read, bool write, bool execute, const char* name)
+      : begin(begin), end(end), read(read), write(write), execute(execute) {
+    strlcpy(this->name, name, sizeof(this->name));
+  }
 };
 
 // This function is not re-entrant since it uses a static buffer for
diff --git a/libmemunreachable/README.md b/libmemunreachable/README.md
index ae8fa94..6d9141a 100644
--- a/libmemunreachable/README.md
+++ b/libmemunreachable/README.md
@@ -12,6 +12,27 @@
 Usage
 -------
 
+### In Android apps ###
+
+libmemunreachble is loaded by zygote and can be triggered with `dumpsys -t 600 meminfo --unreachable [process]`.
+
+To enable malloc\_debug backtraces on allocations for a single app process on a userdebug device, use:
+```
+adb root
+adb shell setprop libc.debug.malloc.program app_process
+adb shell setprop wrap.[process] "\$\@"
+adb shell setprop libc.debug.malloc.options backtrace=4
+```
+
+Kill and restart the app, trigger the leak, and then run `dumpsys -t 600 meminfo --unreachable [process]`.
+
+To disable malloc\_debug:
+```
+adb shell setprop libc.debug.malloc.options "''"
+adb shell setprop libc.debug.malloc.program "''"
+adb shell setprop wrap.[process]  "''"
+```
+
 ### C interface ###
 
 #### `bool LogUnreachableMemory(bool log_contents, size_t limit)` ####
diff --git a/libmemunreachable/include/memunreachable/memunreachable.h b/libmemunreachable/include/memunreachable/memunreachable.h
index 438fcaf..c028eab 100644
--- a/libmemunreachable/include/memunreachable/memunreachable.h
+++ b/libmemunreachable/include/memunreachable/memunreachable.h
@@ -62,12 +62,7 @@
   size_t allocation_bytes;
 
   UnreachableMemoryInfo() {}
-  ~UnreachableMemoryInfo() {
-    // Clear the memory that holds the leaks, otherwise the next attempt to
-    // detect leaks may find the old data (for example in the jemalloc tcache)
-    // and consider all the leaks to be referenced.
-    memset(leaks.data(), 0, leaks.capacity() * sizeof(Leak));
-  }
+  ~UnreachableMemoryInfo();
 
   std::string ToString(bool log_contents) const;
 };
diff --git a/libmemunreachable/tests/MemUnreachable_test.cpp b/libmemunreachable/tests/MemUnreachable_test.cpp
index 87417f1..bba0c6d 100644
--- a/libmemunreachable/tests/MemUnreachable_test.cpp
+++ b/libmemunreachable/tests/MemUnreachable_test.cpp
@@ -23,6 +23,8 @@
 
 #include <memunreachable/memunreachable.h>
 
+#include "bionic.h"
+
 namespace android {
 
 class HiddenPointer {
@@ -48,7 +50,35 @@
   write(0, ptr, 0);
 }
 
-TEST(MemunreachableTest, clean) {
+class MemunreachableTest : public ::testing::Test {
+ protected:
+  virtual void SetUp() {
+    CleanStack(8192);
+    CleanTcache();
+  }
+
+  virtual void TearDown() {
+    CleanStack(8192);
+    CleanTcache();
+  }
+
+  // Allocate a buffer on the stack and zero it to make sure there are no
+  // stray pointers from old test runs.
+  void __attribute__((noinline)) CleanStack(size_t size) {
+    void* buf = alloca(size);
+    memset(buf, 0, size);
+    Ref(&buf);
+  }
+
+  // Disable and re-enable malloc to flush the jemalloc tcache to make sure
+  // there are stray pointers from old test runs there.
+  void CleanTcache() {
+    malloc_disable();
+    malloc_enable();
+  }
+};
+
+TEST_F(MemunreachableTest, clean) {
   UnreachableMemoryInfo info;
 
   ASSERT_TRUE(LogUnreachableMemory(true, 100));
@@ -57,7 +87,7 @@
   ASSERT_EQ(0U, info.leaks.size());
 }
 
-TEST(MemunreachableTest, stack) {
+TEST_F(MemunreachableTest, stack) {
   HiddenPointer hidden_ptr;
 
   {
@@ -91,7 +121,7 @@
 
 void* g_ptr;
 
-TEST(MemunreachableTest, global) {
+TEST_F(MemunreachableTest, global) {
   HiddenPointer hidden_ptr;
 
   g_ptr = hidden_ptr.Get();
@@ -122,7 +152,7 @@
   }
 }
 
-TEST(MemunreachableTest, tls) {
+TEST_F(MemunreachableTest, tls) {
   HiddenPointer hidden_ptr;
   pthread_key_t key;
   pthread_key_create(&key, nullptr);
@@ -157,10 +187,22 @@
   pthread_key_delete(key);
 }
 
-TEST(MemunreachableTest, twice) {
+TEST_F(MemunreachableTest, twice) {
   HiddenPointer hidden_ptr;
 
   {
+    void* ptr = hidden_ptr.Get();
+    Ref(&ptr);
+
+    UnreachableMemoryInfo info;
+
+    ASSERT_TRUE(GetUnreachableMemory(info));
+    ASSERT_EQ(0U, info.leaks.size());
+
+    ptr = nullptr;
+  }
+
+  {
     UnreachableMemoryInfo info;
 
     ASSERT_TRUE(GetUnreachableMemory(info));
@@ -184,7 +226,7 @@
   }
 }
 
-TEST(MemunreachableTest, log) {
+TEST_F(MemunreachableTest, log) {
   HiddenPointer hidden_ptr;
 
   ASSERT_TRUE(LogUnreachableMemory(true, 100));
@@ -199,17 +241,23 @@
   }
 }
 
-TEST(MemunreachableTest, notdumpable) {
+TEST_F(MemunreachableTest, notdumpable) {
+  if (getuid() == 0) {
+    // TODO(ccross): make this a skipped test when gtest supports them
+    printf("[ SKIP     ] Not testable when running as root\n");
+    return;
+  }
+
   ASSERT_EQ(0, prctl(PR_SET_DUMPABLE, 0));
 
   HiddenPointer hidden_ptr;
 
-  ASSERT_TRUE(LogUnreachableMemory(true, 100));
+  EXPECT_FALSE(LogUnreachableMemory(true, 100));
 
   ASSERT_EQ(0, prctl(PR_SET_DUMPABLE, 1));
 }
 
-TEST(MemunreachableTest, leak_lots) {
+TEST_F(MemunreachableTest, leak_lots) {
   std::vector<HiddenPointer> hidden_ptrs;
   hidden_ptrs.resize(1024);
 
diff --git a/libmetricslogger/Android.bp b/libmetricslogger/Android.bp
index 6549b8d..e6e17ce 100644
--- a/libmetricslogger/Android.bp
+++ b/libmetricslogger/Android.bp
@@ -29,6 +29,13 @@
     defaults: ["metricslogger_defaults"],
 }
 
+// static version of libmetricslogger, needed by a few art static binaries
+cc_library_static {
+    name: "libmetricslogger_static",
+    srcs: metricslogger_lib_src_files,
+    defaults: ["metricslogger_defaults"],
+}
+
 // metricslogger shared library, debug
 // -----------------------------------------------------------------------------
 cc_library_shared {
diff --git a/libmetricslogger/include/metricslogger/metrics_logger.h b/libmetricslogger/include/metricslogger/metrics_logger.h
index 189bc4b..2c76869 100644
--- a/libmetricslogger/include/metricslogger/metrics_logger.h
+++ b/libmetricslogger/include/metricslogger/metrics_logger.h
@@ -14,6 +14,7 @@
  * limitations under the License.
  */
 
+#include <log/log_event_list.h>
 #include <cstdint>
 #include <string>
 
@@ -32,6 +33,34 @@
 // |value| in the field |field|.
 void LogMultiAction(int32_t category, int32_t field, const std::string& value);
 
+// Logs a Tron complex event.
+//
+// A complex event can include data in a structure not suppored by the other
+// log event types above.
+//
+// Note that instances of this class are single use. You must call Record()
+// to write the event to the event log.
+class ComplexEventLogger {
+  private:
+    android_log_event_list logger;
+
+  public:
+    // Create a complex event with category|category|.
+    explicit ComplexEventLogger(int category);
+    // Add tagged data to the event, with the given tag and integer value.
+    void AddTaggedData(int tag, int32_t value);
+    // Add tagged data to the event, with the given tag and string value.
+    void AddTaggedData(int tag, const std::string& value);
+    // Add tagged data to the event, with the given tag and integer value.
+    void AddTaggedData(int tag, int64_t value);
+    // Add tagged data to the event, with the given tag and float value.
+    void AddTaggedData(int tag, float value);
+    // Record this event. This method can only be used once per instance
+    // of ComplexEventLogger. Do not made any subsequent calls to AddTaggedData
+    // after recording an event.
+    void Record();
+};
+
 // TODO: replace these with the metric_logger.proto definitions
 enum {
     LOGBUILDER_CATEGORY = 757,
@@ -44,11 +73,23 @@
 
     ACTION_BOOT = 1098,
     FIELD_PLATFORM_REASON = 1099,
+
+    ACTION_HIDDEN_API_ACCESSED = 1391,
+    FIELD_HIDDEN_API_ACCESS_METHOD = 1392,
+    FIELD_HIDDEN_API_ACCESS_DENIED = 1393,
+    FIELD_HIDDEN_API_SIGNATURE = 1394,
 };
 
 enum {
     TYPE_ACTION = 4,
 };
 
+enum {
+    ACCESS_METHOD_NONE = 0,
+    ACCESS_METHOD_REFLECTION = 1,
+    ACCESS_METHOD_JNI = 2,
+    ACCESS_METHOD_LINKING = 3,
+};
+
 }  // namespace metricslogger
 }  // namespace android
diff --git a/libmetricslogger/metrics_logger.cpp b/libmetricslogger/metrics_logger.cpp
index fdc4407..912fa12 100644
--- a/libmetricslogger/metrics_logger.cpp
+++ b/libmetricslogger/metrics_logger.cpp
@@ -23,9 +23,14 @@
 
 namespace {
 
+#ifdef __ANDROID__
 EventTagMap* kEventTagMap = android_openEventTagMap(nullptr);
 const int kSysuiMultiActionTag = android_lookupEventTagNum(
     kEventTagMap, "sysui_multi_action", "(content|4)", ANDROID_LOG_UNKNOWN);
+#else
+// android_openEventTagMap does not work on host builds.
+const int kSysuiMultiActionTag = 0;
+#endif
 
 }  // namespace
 
@@ -53,5 +58,29 @@
         << field << value << LOG_ID_EVENTS;
 }
 
+ComplexEventLogger::ComplexEventLogger(int category) : logger(kSysuiMultiActionTag) {
+    logger << LOGBUILDER_CATEGORY << category;
+}
+
+void ComplexEventLogger::AddTaggedData(int tag, int32_t value) {
+    logger << tag << value;
+}
+
+void ComplexEventLogger::AddTaggedData(int tag, const std::string& value) {
+    logger << tag << value;
+}
+
+void ComplexEventLogger::AddTaggedData(int tag, int64_t value) {
+    logger << tag << value;
+}
+
+void ComplexEventLogger::AddTaggedData(int tag, float value) {
+    logger << tag << value;
+}
+
+void ComplexEventLogger::Record() {
+    logger << LOG_ID_EVENTS;
+}
+
 }  // namespace metricslogger
 }  // namespace android
diff --git a/libpackagelistparser/Android.bp b/libpackagelistparser/Android.bp
index 27693b3..c38594a 100644
--- a/libpackagelistparser/Android.bp
+++ b/libpackagelistparser/Android.bp
@@ -1,6 +1,7 @@
 cc_library {
 
     name: "libpackagelistparser",
+    recovery_available: true,
     srcs: ["packagelistparser.c"],
     cflags: [
         "-Wall",
diff --git a/libprocinfo/Android.bp b/libprocinfo/Android.bp
index b35882c..d776b3d 100644
--- a/libprocinfo/Android.bp
+++ b/libprocinfo/Android.bp
@@ -59,6 +59,7 @@
     host_supported: true,
     srcs: [
         "process_test.cpp",
+        "process_map_test.cpp",
     ],
     target: {
         darwin: {
@@ -84,5 +85,36 @@
         },
     },
 
+    data: [
+        "testdata/*",
+    ],
+
     test_suites: ["device-tests"],
 }
+
+cc_benchmark {
+    name: "libprocinfo_benchmark",
+    defaults: ["libprocinfo_defaults"],
+    srcs: [
+        "process_map_benchmark.cpp",
+    ],
+    shared_libs: [
+        "libbacktrace",
+        "libbase",
+        "libprocinfo",
+        "libunwindstack",
+    ],
+    compile_multilib: "both",
+    multilib: {
+        lib32: {
+            suffix: "32",
+        },
+        lib64: {
+            suffix: "64",
+        },
+    },
+
+    data: [
+        "testdata/*",
+    ],
+}
diff --git a/libprocinfo/include/procinfo/process_map.h b/libprocinfo/include/procinfo/process_map.h
new file mode 100644
index 0000000..3771f9f
--- /dev/null
+++ b/libprocinfo/include/procinfo/process_map.h
@@ -0,0 +1,151 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+
+#include <functional>
+#include <string>
+
+#include <android-base/file.h>
+
+namespace android {
+namespace procinfo {
+
+template <class CallbackType>
+bool ReadMapFileContent(char* content, const CallbackType& callback) {
+  uint64_t start_addr;
+  uint64_t end_addr;
+  uint16_t flags;
+  uint64_t pgoff;
+  char* next_line = content;
+  char* p;
+
+  auto pass_space = [&]() {
+    if (*p != ' ') {
+      return false;
+    }
+    while (*p == ' ') {
+      p++;
+    }
+    return true;
+  };
+
+  auto pass_xdigit = [&]() {
+    if (!isxdigit(*p)) {
+      return false;
+    }
+    do {
+      p++;
+    } while (isxdigit(*p));
+    return true;
+  };
+
+  while (next_line != nullptr && *next_line != '\0') {
+    p = next_line;
+    next_line = strchr(next_line, '\n');
+    if (next_line != nullptr) {
+      *next_line = '\0';
+      next_line++;
+    }
+    // Parse line like: 00400000-00409000 r-xp 00000000 fc:00 426998  /usr/lib/gvfs/gvfsd-http
+    char* end;
+    // start_addr
+    start_addr = strtoull(p, &end, 16);
+    if (end == p || *end != '-') {
+      return false;
+    }
+    p = end + 1;
+    // end_addr
+    end_addr = strtoull(p, &end, 16);
+    if (end == p) {
+      return false;
+    }
+    p = end;
+    if (!pass_space()) {
+      return false;
+    }
+    // flags
+    flags = 0;
+    if (*p == 'r') {
+      flags |= PROT_READ;
+    } else if (*p != '-') {
+      return false;
+    }
+    p++;
+    if (*p == 'w') {
+      flags |= PROT_WRITE;
+    } else if (*p != '-') {
+      return false;
+    }
+    p++;
+    if (*p == 'x') {
+      flags |= PROT_EXEC;
+    } else if (*p != '-') {
+      return false;
+    }
+    p++;
+    if (*p != 'p' && *p != 's') {
+      return false;
+    }
+    p++;
+    if (!pass_space()) {
+      return false;
+    }
+    // pgoff
+    pgoff = strtoull(p, &end, 16);
+    if (end == p) {
+      return false;
+    }
+    p = end;
+    if (!pass_space()) {
+      return false;
+    }
+    // major:minor
+    if (!pass_xdigit() || *p++ != ':' || !pass_xdigit() || !pass_space()) {
+      return false;
+    }
+    // inode
+    if (!pass_xdigit() || (*p != '\0' && !pass_space())) {
+      return false;
+    }
+    // filename
+    callback(start_addr, end_addr, flags, pgoff, p);
+  }
+  return true;
+}
+
+inline bool ReadMapFile(
+    const std::string& map_file,
+    const std::function<void(uint64_t, uint64_t, uint16_t, uint64_t, const char*)>& callback) {
+  std::string content;
+  if (!android::base::ReadFileToString(map_file, &content)) {
+    return false;
+  }
+  return ReadMapFileContent(&content[0], callback);
+}
+
+inline bool ReadProcessMaps(
+    pid_t pid,
+    const std::function<void(uint64_t, uint64_t, uint16_t, uint64_t, const char*)>& callback) {
+  return ReadMapFile("/proc/" + std::to_string(pid) + "/maps", callback);
+}
+
+} /* namespace procinfo */
+} /* namespace android */
diff --git a/libprocinfo/process_map_benchmark.cpp b/libprocinfo/process_map_benchmark.cpp
new file mode 100644
index 0000000..d9e8a4d
--- /dev/null
+++ b/libprocinfo/process_map_benchmark.cpp
@@ -0,0 +1,85 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <procinfo/process_map.h>
+
+#include <string.h>
+
+#include <string>
+
+#include <android-base/file.h>
+#include <android-base/logging.h>
+#include <backtrace/BacktraceMap.h>
+#include <unwindstack/Maps.h>
+
+#include <benchmark/benchmark.h>
+
+struct MapInfo {
+  uint64_t start;
+  uint64_t end;
+  uint16_t flags;
+  uint64_t pgoff;
+  const std::string name;
+
+  MapInfo(uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, const char* name)
+      : start(start), end(end), flags(flags), pgoff(pgoff), name(name) {}
+};
+
+static void BM_ReadMapFile(benchmark::State& state) {
+  std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+  for (auto _ : state) {
+    std::vector<MapInfo> maps;
+    android::procinfo::ReadMapFile(
+        map_file, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff,
+                      const char* name) { maps.emplace_back(start, end, flags, pgoff, name); });
+    CHECK_EQ(maps.size(), 2043u);
+  }
+}
+BENCHMARK(BM_ReadMapFile);
+
+static void BM_unwindstack_FileMaps(benchmark::State& state) {
+  std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+  for (auto _ : state) {
+    unwindstack::FileMaps maps(map_file);
+    maps.Parse();
+    CHECK_EQ(maps.Total(), 2043u);
+  }
+}
+BENCHMARK(BM_unwindstack_FileMaps);
+
+static void BM_unwindstack_BufferMaps(benchmark::State& state) {
+  std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+  std::string content;
+  CHECK(android::base::ReadFileToString(map_file, &content));
+  for (auto _ : state) {
+    unwindstack::BufferMaps maps(content.c_str());
+    maps.Parse();
+    CHECK_EQ(maps.Total(), 2043u);
+  }
+}
+BENCHMARK(BM_unwindstack_BufferMaps);
+
+static void BM_backtrace_BacktraceMap(benchmark::State& state) {
+  pid_t pid = getpid();
+  for (auto _ : state) {
+    BacktraceMap* map = BacktraceMap::Create(pid, true);
+    CHECK(map != nullptr);
+    delete map;
+  }
+}
+BENCHMARK(BM_backtrace_BacktraceMap);
+
+BENCHMARK_MAIN();
diff --git a/libprocinfo/process_map_test.cpp b/libprocinfo/process_map_test.cpp
new file mode 100644
index 0000000..900fd85
--- /dev/null
+++ b/libprocinfo/process_map_test.cpp
@@ -0,0 +1,60 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include <procinfo/process_map.h>
+
+#include <string>
+
+#include <android-base/file.h>
+
+#include <gtest/gtest.h>
+
+struct MapInfo {
+  uint64_t start;
+  uint64_t end;
+  uint16_t flags;
+  uint64_t pgoff;
+  const std::string name;
+
+  MapInfo(uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, const char* name)
+      : start(start), end(end), flags(flags), pgoff(pgoff), name(name) {}
+};
+
+TEST(process_map, smoke) {
+  std::string map_file = android::base::GetExecutableDirectory() + "/testdata/maps";
+  std::vector<MapInfo> maps;
+  ASSERT_TRUE(android::procinfo::ReadMapFile(
+      map_file, [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff,
+                    const char* name) { maps.emplace_back(start, end, flags, pgoff, name); }));
+  ASSERT_EQ(2043u, maps.size());
+  ASSERT_EQ(maps[0].start, 0x12c00000ULL);
+  ASSERT_EQ(maps[0].end, 0x2ac00000ULL);
+  ASSERT_EQ(maps[0].flags, PROT_READ | PROT_WRITE);
+  ASSERT_EQ(maps[0].pgoff, 0ULL);
+  ASSERT_EQ(maps[0].name, "/dev/ashmem/dalvik-main space (region space) (deleted)");
+  ASSERT_EQ(maps[876].start, 0x70e6c4f000ULL);
+  ASSERT_EQ(maps[876].end, 0x70e6c6b000ULL);
+  ASSERT_EQ(maps[876].flags, PROT_READ | PROT_EXEC);
+  ASSERT_EQ(maps[876].pgoff, 0ULL);
+  ASSERT_EQ(maps[876].name, "/system/lib64/libutils.so");
+  ASSERT_EQ(maps[1260].start, 0x70e96fa000ULL);
+  ASSERT_EQ(maps[1260].end, 0x70e96fb000ULL);
+  ASSERT_EQ(maps[1260].flags, PROT_READ);
+  ASSERT_EQ(maps[1260].pgoff, 0ULL);
+  ASSERT_EQ(maps[1260].name,
+            "/dev/ashmem/dalvik-classes.dex extracted in memory from "
+            "/data/app/com.google.sample.tunnel-HGGRU03Gu1Mwkf_-RnFmvw==/base.apk (deleted)");
+}
diff --git a/libprocinfo/testdata/maps b/libprocinfo/testdata/maps
new file mode 100644
index 0000000..3b312e3
--- /dev/null
+++ b/libprocinfo/testdata/maps
@@ -0,0 +1,2043 @@
+12c00000-2ac00000 rw-p 00000000 00:05 10267643                           /dev/ashmem/dalvik-main space (region space) (deleted)
+6fb5d000-6fd6e000 rw-p 00000000 103:1d 639511                            /data/dalvik-cache/arm64/system@framework@boot.art
+6fd6e000-6fd82000 r--p 00211000 103:1d 639511                            /data/dalvik-cache/arm64/system@framework@boot.art
+6fd82000-6fe47000 rw-p 00000000 103:1d 639514                            /data/dalvik-cache/arm64/system@framework@boot-core-libart.art
+6fe47000-6fe52000 r--p 000c5000 103:1d 639514                            /data/dalvik-cache/arm64/system@framework@boot-core-libart.art
+6fe52000-6fe84000 rw-p 00000000 103:1d 639517                            /data/dalvik-cache/arm64/system@framework@boot-conscrypt.art
+6fe84000-6fe87000 r--p 00032000 103:1d 639517                            /data/dalvik-cache/arm64/system@framework@boot-conscrypt.art
+6fe87000-6feb2000 rw-p 00000000 103:1d 639520                            /data/dalvik-cache/arm64/system@framework@boot-okhttp.art
+6feb2000-6feb5000 r--p 0002b000 103:1d 639520                            /data/dalvik-cache/arm64/system@framework@boot-okhttp.art
+6feb5000-6fef4000 rw-p 00000000 103:1d 639523                            /data/dalvik-cache/arm64/system@framework@boot-bouncycastle.art
+6fef4000-6fefb000 r--p 0003f000 103:1d 639523                            /data/dalvik-cache/arm64/system@framework@boot-bouncycastle.art
+6fefb000-6ff3f000 rw-p 00000000 103:1d 639526                            /data/dalvik-cache/arm64/system@framework@boot-apache-xml.art
+6ff3f000-6ff45000 r--p 00044000 103:1d 639526                            /data/dalvik-cache/arm64/system@framework@boot-apache-xml.art
+6ff45000-6ff7a000 rw-p 00000000 103:1d 639529                            /data/dalvik-cache/arm64/system@framework@boot-ext.art
+6ff7a000-6ff85000 r--p 00035000 103:1d 639529                            /data/dalvik-cache/arm64/system@framework@boot-ext.art
+6ff85000-70594000 rw-p 00000000 103:1d 639532                            /data/dalvik-cache/arm64/system@framework@boot-framework.art
+70594000-705cb000 r--p 0060f000 103:1d 639532                            /data/dalvik-cache/arm64/system@framework@boot-framework.art
+705cb000-7061f000 rw-p 00000000 103:1d 639535                            /data/dalvik-cache/arm64/system@framework@boot-telephony-common.art
+7061f000-70629000 r--p 00054000 103:1d 639535                            /data/dalvik-cache/arm64/system@framework@boot-telephony-common.art
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+70629ba000-70629bb000 ---p 00000000 00:00 0                              [anon:thread signal stack guard]
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+70e69cb000-70e69e1000 r-xp 00000000 fc:00 2537                           /system/lib64/liblog.so
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+70e6adc000-70e6ae0000 r-xp 00000000 fc:00 2555                           /system/lib64/libstagefright_omx_utils.so
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+70eaf43000-70eaf44000 ---p 00000000 00:00 0                              [anon:thread signal stack guard]
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+70ebc59000-70ebc5d000 rw-p 00000000 00:05 10270744                       /dev/ashmem/dalvik-thread local mark stack (deleted)
+70ebc5d000-70ebc7d000 r--s 00000000 00:10 16599                          /dev/__properties__/u:object_r:exported_dalvik_prop:s0
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+70ebdc1000-70ebdc2000 rw-p 00000000 00:00 0                              [anon:linker_alloc_small_objects]
+70ebdc2000-70ebdc3000 rw-p 00000000 00:00 0                              [anon:linker_alloc_vector]
+70ebdc3000-70ebdc5000 rw-p 00000000 00:00 0                              [anon:linker_alloc_small_objects]
+70ebdc5000-70ebde5000 r--s 00000000 00:10 16600                          /dev/__properties__/u:object_r:exported_default_prop:s0
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+70ebde6000-70ebde8000 r--p 00000000 00:00 0                              [anon:linker_alloc]
+70ebde8000-70ebe08000 r--s 00000000 00:10 16582                          /dev/__properties__/u:object_r:debug_prop:s0
+70ebe08000-70ebe09000 ---p 00000000 00:00 0 
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+70ebe0a000-70ebe0b000 ---p 00000000 00:00 0 
+70ebe0b000-70ebe2b000 r--s 00000000 00:10 16669                          /dev/__properties__/properties_serial
+70ebe2b000-70ebe2d000 rw-p 00000000 00:00 0                              [anon:System property context nodes]
+70ebe2d000-70ebf55000 r-xp 00000000 fc:00 3184                           /system/bin/linker64
+70ebf55000-70ebf5f000 r--s 00000000 00:10 16560                          /dev/__properties__/property_info
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+70ebf60000-70ebf61000 rw-p 00000000 00:00 0                              [anon:linker_alloc_vector]
+70ebf61000-70ebf62000 rw-p 00000000 00:00 0                              [anon:linker_alloc_small_objects]
+70ebf62000-70ebf63000 rw-p 00000000 00:00 0                              [anon:arc4random data]
+70ebf63000-70ebf64000 rw-p 00000000 00:00 0                              [anon:linker_alloc_small_objects]
+70ebf64000-70ebf65000 r--p 00000000 00:00 0                              [anon:atexit handlers]
+70ebf65000-70ebf66000 ---p 00000000 00:00 0                              [anon:thread signal stack guard]
+70ebf66000-70ebf6a000 rw-p 00000000 00:00 0                              [anon:thread signal stack]
+70ebf6a000-70ebf6b000 rw-p 00000000 00:00 0                              [anon:arc4random data]
+70ebf6b000-70ebf6c000 ---p 00000000 00:00 0                              [anon:bionic TLS guard]
+70ebf6c000-70ebf6f000 rw-p 00000000 00:00 0                              [anon:bionic TLS]
+70ebf6f000-70ebf70000 ---p 00000000 00:00 0                              [anon:bionic TLS guard]
+70ebf70000-70ebf71000 r--p 00000000 00:00 0                              [vvar]
+70ebf71000-70ebf72000 r-xp 00000000 00:00 0                              [vdso]
+70ebf72000-70ebf7d000 r--p 00135000 fc:00 3184                           /system/bin/linker64
+70ebf7d000-70ebf7e000 rw-p 00140000 fc:00 3184                           /system/bin/linker64
+70ebf7e000-70ebf81000 rw-p 00000000 00:00 0 
+70ebf81000-70ebf82000 r--p 00000000 00:00 0 
+70ebf82000-70ebf89000 rw-p 00000000 00:00 0 
+7fc7df1000-7fc7df2000 ---p 00000000 00:00 0 
+7fc7df2000-7fc85f1000 rw-p 00000000 00:00 0                              [stack]
diff --git a/libstats/Android.bp b/libstats/Android.bp
new file mode 100644
index 0000000..d58f294
--- /dev/null
+++ b/libstats/Android.bp
@@ -0,0 +1,37 @@
+//
+// Copyright (C) 2018 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+
+// ==========================================================
+// Native library to write stats log to statsd socket
+// ==========================================================
+cc_library_static {
+    name: "libstatssocket",
+    srcs: [
+        "stats_event_list.c",
+        "statsd_writer.c",
+    ],
+    cflags: [
+        "-Wall",
+        "-Werror",
+        "-DLIBLOG_LOG_TAG=1006",
+        "-DWRITE_TO_STATSD=1",
+        "-DWRITE_TO_LOGD=0",
+    ],
+    export_include_dirs: ["include"],
+    shared_libs: [
+        "liblog",
+    ],
+}
diff --git a/libstats/OWNERS b/libstats/OWNERS
new file mode 100644
index 0000000..ed06fbc
--- /dev/null
+++ b/libstats/OWNERS
@@ -0,0 +1,4 @@
+bookatz@google.com
+joeo@google.com
+yaochen@google.com
+yanglu@google.com
diff --git a/libstats/include/stats_event_list.h b/libstats/include/stats_event_list.h
new file mode 100644
index 0000000..5d174ae
--- /dev/null
+++ b/libstats/include/stats_event_list.h
@@ -0,0 +1,250 @@
+/*
+ * Copyright (C) 2018, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_STATS_LOG_STATS_EVENT_LIST_H
+#define ANDROID_STATS_LOG_STATS_EVENT_LIST_H
+
+#include <log/log_event_list.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+void reset_log_context(android_log_context ctx);
+int write_to_logger(android_log_context context, log_id_t id);
+
+#ifdef __cplusplus
+}
+#endif
+
+#ifdef __cplusplus
+/**
+ * A copy of android_log_event_list class.
+ *
+ * android_log_event_list is going to be deprecated soon, so copy it here to
+ * avoid creating dependency on upstream code. TODO(b/78304629): Rewrite this
+ * code.
+ */
+class stats_event_list {
+  private:
+    android_log_context ctx;
+    int ret;
+
+    stats_event_list(const stats_event_list&) = delete;
+    void operator=(const stats_event_list&) = delete;
+
+  public:
+    explicit stats_event_list(int tag) : ret(0) {
+        ctx = create_android_logger(static_cast<uint32_t>(tag));
+    }
+    explicit stats_event_list(log_msg& log_msg) : ret(0) {
+        ctx = create_android_log_parser(log_msg.msg() + sizeof(uint32_t),
+                                        log_msg.entry.len - sizeof(uint32_t));
+    }
+    ~stats_event_list() { android_log_destroy(&ctx); }
+
+    int close() {
+        int retval = android_log_destroy(&ctx);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return retval;
+    }
+
+    /* To allow above C calls to use this class as parameter */
+    operator android_log_context() const { return ctx; }
+
+    /* return errors or transmit status */
+    int status() const { return ret; }
+
+    int begin() {
+        int retval = android_log_write_list_begin(ctx);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret;
+    }
+    int end() {
+        int retval = android_log_write_list_end(ctx);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret;
+    }
+
+    stats_event_list& operator<<(int32_t value) {
+        int retval = android_log_write_int32(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    stats_event_list& operator<<(uint32_t value) {
+        int retval = android_log_write_int32(ctx, static_cast<int32_t>(value));
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    stats_event_list& operator<<(bool value) {
+        int retval = android_log_write_int32(ctx, value ? 1 : 0);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    stats_event_list& operator<<(int64_t value) {
+        int retval = android_log_write_int64(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    stats_event_list& operator<<(uint64_t value) {
+        int retval = android_log_write_int64(ctx, static_cast<int64_t>(value));
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    stats_event_list& operator<<(const char* value) {
+        int retval = android_log_write_string8(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+#if defined(_USING_LIBCXX)
+    stats_event_list& operator<<(const std::string& value) {
+        int retval = android_log_write_string8_len(ctx, value.data(), value.length());
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+#endif
+
+    stats_event_list& operator<<(float value) {
+        int retval = android_log_write_float32(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return *this;
+    }
+
+    int write(log_id_t id = LOG_ID_EVENTS) {
+        /* facilitate -EBUSY retry */
+        if ((ret == -EBUSY) || (ret > 0)) {
+            ret = 0;
+        }
+        int retval = write_to_logger(ctx, id);
+        /* existing errors trump transmission errors */
+        if (!ret) {
+            ret = retval;
+        }
+        return ret;
+    }
+
+    /*
+     * Append<Type> methods removes any integer promotion
+     * confusion, and adds access to string with length.
+     * Append methods are also added for all types for
+     * convenience.
+     */
+
+    bool AppendInt(int32_t value) {
+        int retval = android_log_write_int32(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+    bool AppendLong(int64_t value) {
+        int retval = android_log_write_int64(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+    bool AppendString(const char* value) {
+        int retval = android_log_write_string8(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+    bool AppendString(const char* value, size_t len) {
+        int retval = android_log_write_string8_len(ctx, value, len);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+#if defined(_USING_LIBCXX)
+    bool AppendString(const std::string& value) {
+        int retval = android_log_write_string8_len(ctx, value.data(), value.length());
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret;
+    }
+
+    bool Append(const std::string& value) {
+        int retval = android_log_write_string8_len(ctx, value.data(), value.length());
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret;
+    }
+#endif
+
+    bool AppendFloat(float value) {
+        int retval = android_log_write_float32(ctx, value);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+    template <typename Tvalue>
+    bool Append(Tvalue value) {
+        *this << value;
+        return ret >= 0;
+    }
+
+    bool Append(const char* value, size_t len) {
+        int retval = android_log_write_string8_len(ctx, value, len);
+        if (retval < 0) {
+            ret = retval;
+        }
+        return ret >= 0;
+    }
+
+    android_log_list_element read() { return android_log_read_next(ctx); }
+    android_log_list_element peek() { return android_log_peek_next(ctx); }
+};
+
+#endif
+#endif  // ANDROID_STATS_LOG_STATS_EVENT_LIST_H
diff --git a/libstats/stats_event_list.c b/libstats/stats_event_list.c
new file mode 100644
index 0000000..966bb08
--- /dev/null
+++ b/libstats/stats_event_list.c
@@ -0,0 +1,181 @@
+/*
+ * Copyright (C) 2018, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "include/stats_event_list.h"
+
+#include <string.h>
+#include "statsd_writer.h"
+
+#define MAX_EVENT_PAYLOAD (LOGGER_ENTRY_MAX_PAYLOAD - sizeof(int32_t))
+
+typedef struct {
+    uint32_t tag;
+    unsigned pos;                                    /* Read/write position into buffer */
+    unsigned count[ANDROID_MAX_LIST_NEST_DEPTH + 1]; /* Number of elements   */
+    unsigned list[ANDROID_MAX_LIST_NEST_DEPTH + 1];  /* pos for list counter */
+    unsigned list_nest_depth;
+    unsigned len; /* Length or raw buffer. */
+    bool overflow;
+    bool list_stop; /* next call decrement list_nest_depth and issue a stop */
+    enum {
+        kAndroidLoggerRead = 1,
+        kAndroidLoggerWrite = 2,
+    } read_write_flag;
+    uint8_t storage[LOGGER_ENTRY_MAX_PAYLOAD];
+} android_log_context_internal;
+
+extern struct android_log_transport_write statsdLoggerWrite;
+
+static int __write_to_statsd_init(struct iovec* vec, size_t nr);
+static int (*write_to_statsd)(struct iovec* vec, size_t nr) = __write_to_statsd_init;
+
+// Similar to create_android_logger(), but instead of allocation a new buffer,
+// this function resets the buffer for resuse.
+void reset_log_context(android_log_context ctx) {
+    if (!ctx) {
+        return;
+    }
+    android_log_context_internal* context = (android_log_context_internal*)(ctx);
+    uint32_t tag = context->tag;
+    memset(context, 0, sizeof(android_log_context_internal));
+
+    context->tag = tag;
+    context->read_write_flag = kAndroidLoggerWrite;
+    size_t needed = sizeof(uint8_t) + sizeof(uint8_t);
+    if ((context->pos + needed) > MAX_EVENT_PAYLOAD) {
+        context->overflow = true;
+    }
+    /* Everything is a list */
+    context->storage[context->pos + 0] = EVENT_TYPE_LIST;
+    context->list[0] = context->pos + 1;
+    context->pos += needed;
+}
+
+int stats_write_list(android_log_context ctx) {
+    android_log_context_internal* context;
+    const char* msg;
+    ssize_t len;
+
+    context = (android_log_context_internal*)(ctx);
+    if (!context || (kAndroidLoggerWrite != context->read_write_flag)) {
+        return -EBADF;
+    }
+
+    if (context->list_nest_depth) {
+        return -EIO;
+    }
+
+    /* NB: if there was overflow, then log is truncated. Nothing reported */
+    context->storage[1] = context->count[0];
+    len = context->len = context->pos;
+    msg = (const char*)context->storage;
+    /* it's not a list */
+    if (context->count[0] <= 1) {
+        len -= sizeof(uint8_t) + sizeof(uint8_t);
+        if (len < 0) {
+            len = 0;
+        }
+        msg += sizeof(uint8_t) + sizeof(uint8_t);
+    }
+
+    struct iovec vec[2];
+    vec[0].iov_base = &context->tag;
+    vec[0].iov_len = sizeof(context->tag);
+    vec[1].iov_base = (void*)msg;
+    vec[1].iov_len = len;
+    return write_to_statsd(vec, 2);
+}
+
+int write_to_logger(android_log_context ctx, log_id_t id) {
+    int retValue = 0;
+
+    if (WRITE_TO_LOGD) {
+        retValue = android_log_write_list(ctx, id);
+    }
+
+    if (WRITE_TO_STATSD) {
+        // log_event_list's cast operator is overloaded.
+        int ret = stats_write_list(ctx);
+        // In debugging phase, we may write to both logd and statsd. Prefer to
+        // return statsd socket write error code here.
+        if (ret < 0) {
+            retValue = ret;
+        }
+    }
+
+    return retValue;
+}
+
+/* log_init_lock assumed */
+static int __write_to_statsd_initialize_locked() {
+    if (!statsdLoggerWrite.open || ((*statsdLoggerWrite.open)() < 0)) {
+        if (statsdLoggerWrite.close) {
+            (*statsdLoggerWrite.close)();
+            return -ENODEV;
+        }
+    }
+    return 1;
+}
+
+static int __write_to_stats_daemon(struct iovec* vec, size_t nr) {
+    int ret, save_errno;
+    struct timespec ts;
+    size_t len, i;
+
+    for (len = i = 0; i < nr; ++i) {
+        len += vec[i].iov_len;
+    }
+    if (!len) {
+        return -EINVAL;
+    }
+
+    save_errno = errno;
+    clock_gettime(CLOCK_REALTIME, &ts);
+
+    ret = 0;
+
+    ssize_t retval;
+    retval = (*statsdLoggerWrite.write)(&ts, vec, nr);
+    if (ret >= 0) {
+        ret = retval;
+    }
+
+    errno = save_errno;
+    return ret;
+}
+
+static int __write_to_statsd_init(struct iovec* vec, size_t nr) {
+    int ret, save_errno = errno;
+
+    statsd_writer_init_lock();
+
+    if (write_to_statsd == __write_to_statsd_init) {
+        ret = __write_to_statsd_initialize_locked();
+        if (ret < 0) {
+            statsd_writer_init_unlock();
+            errno = save_errno;
+            return ret;
+        }
+
+        write_to_statsd = __write_to_stats_daemon;
+    }
+
+    statsd_writer_init_unlock();
+
+    ret = write_to_statsd(vec, nr);
+    errno = save_errno;
+    return ret;
+}
\ No newline at end of file
diff --git a/libstats/statsd_writer.c b/libstats/statsd_writer.c
new file mode 100644
index 0000000..9953bba
--- /dev/null
+++ b/libstats/statsd_writer.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright (C) 2018, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#include "statsd_writer.h"
+
+#include <cutils/sockets.h>
+#include <endian.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <poll.h>
+#include <private/android_filesystem_config.h>
+#include <private/android_logger.h>
+#include <stdarg.h>
+#include <stdatomic.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <sys/un.h>
+#include <time.h>
+#include <unistd.h>
+
+/* branchless on many architectures. */
+#define min(x, y) ((y) ^ (((x) ^ (y)) & -((x) < (y))))
+
+static pthread_mutex_t log_init_lock = PTHREAD_MUTEX_INITIALIZER;
+
+void statsd_writer_init_lock() {
+    /*
+     * If we trigger a signal handler in the middle of locked activity and the
+     * signal handler logs a message, we could get into a deadlock state.
+     */
+    pthread_mutex_lock(&log_init_lock);
+}
+
+int statd_writer_trylock() {
+    return pthread_mutex_trylock(&log_init_lock);
+}
+
+void statsd_writer_init_unlock() {
+    pthread_mutex_unlock(&log_init_lock);
+}
+
+static int statsdAvailable();
+static int statsdOpen();
+static void statsdClose();
+static int statsdWrite(struct timespec* ts, struct iovec* vec, size_t nr);
+
+struct android_log_transport_write statsdLoggerWrite = {
+    .name = "statsd",
+    .sock = -EBADF,
+    .available = statsdAvailable,
+    .open = statsdOpen,
+    .close = statsdClose,
+    .write = statsdWrite,
+};
+
+/* log_init_lock assumed */
+static int statsdOpen() {
+    int i, ret = 0;
+
+    i = atomic_load(&statsdLoggerWrite.sock);
+    if (i < 0) {
+        int sock = TEMP_FAILURE_RETRY(socket(PF_UNIX, SOCK_DGRAM | SOCK_CLOEXEC | SOCK_NONBLOCK, 0));
+        if (sock < 0) {
+            ret = -errno;
+        } else {
+            struct sockaddr_un un;
+            memset(&un, 0, sizeof(struct sockaddr_un));
+            un.sun_family = AF_UNIX;
+            strcpy(un.sun_path, "/dev/socket/statsdw");
+
+            if (TEMP_FAILURE_RETRY(
+                    connect(sock, (struct sockaddr*)&un, sizeof(struct sockaddr_un))) < 0) {
+                ret = -errno;
+                switch (ret) {
+                    case -ENOTCONN:
+                    case -ECONNREFUSED:
+                    case -ENOENT:
+                        i = atomic_exchange(&statsdLoggerWrite.sock, ret);
+                    /* FALLTHRU */
+                    default:
+                        break;
+                }
+                close(sock);
+            } else {
+                ret = atomic_exchange(&statsdLoggerWrite.sock, sock);
+                if ((ret >= 0) && (ret != sock)) {
+                    close(ret);
+                }
+                ret = 0;
+            }
+        }
+    }
+
+    return ret;
+}
+
+static void __statsdClose(int negative_errno) {
+    int sock = atomic_exchange(&statsdLoggerWrite.sock, negative_errno);
+    if (sock >= 0) {
+        close(sock);
+    }
+}
+
+static void statsdClose() {
+    __statsdClose(-EBADF);
+}
+
+static int statsdAvailable() {
+    if (atomic_load(&statsdLoggerWrite.sock) < 0) {
+        if (access("/dev/socket/statsdw", W_OK) == 0) {
+            return 0;
+        }
+        return -EBADF;
+    }
+    return 1;
+}
+
+static int statsdWrite(struct timespec* ts, struct iovec* vec, size_t nr) {
+    ssize_t ret;
+    int sock;
+    static const unsigned headerLength = 1;
+    struct iovec newVec[nr + headerLength];
+    android_log_header_t header;
+    size_t i, payloadSize;
+    static atomic_int dropped;
+
+    sock = atomic_load(&statsdLoggerWrite.sock);
+    if (sock < 0) switch (sock) {
+            case -ENOTCONN:
+            case -ECONNREFUSED:
+            case -ENOENT:
+                break;
+            default:
+                return -EBADF;
+        }
+    /*
+     *  struct {
+     *      // what we provide to socket
+     *      android_log_header_t header;
+     *      // caller provides
+     *      union {
+     *          struct {
+     *              char     prio;
+     *              char     payload[];
+     *          } string;
+     *          struct {
+     *              uint32_t tag
+     *              char     payload[];
+     *          } binary;
+     *      };
+     *  };
+     */
+
+    header.tid = gettid();
+    header.realtime.tv_sec = ts->tv_sec;
+    header.realtime.tv_nsec = ts->tv_nsec;
+
+    newVec[0].iov_base = (unsigned char*)&header;
+    newVec[0].iov_len = sizeof(header);
+
+    // If we dropped events before, try to tell statsd.
+    if (sock >= 0) {
+        int32_t snapshot = atomic_exchange_explicit(&dropped, 0, memory_order_relaxed);
+        if (snapshot) {
+            android_log_event_int_t buffer;
+            header.id = LOG_ID_STATS;
+            buffer.header.tag = htole32(LIBLOG_LOG_TAG);
+            buffer.payload.type = EVENT_TYPE_INT;
+            buffer.payload.data = htole32(snapshot);
+
+            newVec[headerLength].iov_base = &buffer;
+            newVec[headerLength].iov_len = sizeof(buffer);
+
+            ret = TEMP_FAILURE_RETRY(writev(sock, newVec, 2));
+            if (ret != (ssize_t)(sizeof(header) + sizeof(buffer))) {
+                atomic_fetch_add_explicit(&dropped, snapshot, memory_order_relaxed);
+            }
+        }
+    }
+
+    header.id = LOG_ID_STATS;
+
+    for (payloadSize = 0, i = headerLength; i < nr + headerLength; i++) {
+        newVec[i].iov_base = vec[i - headerLength].iov_base;
+        payloadSize += newVec[i].iov_len = vec[i - headerLength].iov_len;
+
+        if (payloadSize > LOGGER_ENTRY_MAX_PAYLOAD) {
+            newVec[i].iov_len -= payloadSize - LOGGER_ENTRY_MAX_PAYLOAD;
+            if (newVec[i].iov_len) {
+                ++i;
+            }
+            break;
+        }
+    }
+
+    /*
+     * The write below could be lost, but will never block.
+     *
+     * ENOTCONN occurs if statsd has died.
+     * ENOENT occurs if statsd is not running and socket is missing.
+     * ECONNREFUSED occurs if we can not reconnect to statsd.
+     * EAGAIN occurs if statsd is overloaded.
+     */
+    if (sock < 0) {
+        ret = sock;
+    } else {
+        ret = TEMP_FAILURE_RETRY(writev(sock, newVec, i));
+        if (ret < 0) {
+            ret = -errno;
+        }
+    }
+    switch (ret) {
+        case -ENOTCONN:
+        case -ECONNREFUSED:
+        case -ENOENT:
+            if (statd_writer_trylock()) {
+                return ret; /* in a signal handler? try again when less stressed
+                             */
+            }
+            __statsdClose(ret);
+            ret = statsdOpen();
+            statsd_writer_init_unlock();
+
+            if (ret < 0) {
+                return ret;
+            }
+
+            ret = TEMP_FAILURE_RETRY(writev(atomic_load(&statsdLoggerWrite.sock), newVec, i));
+            if (ret < 0) {
+                ret = -errno;
+            }
+        /* FALLTHRU */
+        default:
+            break;
+    }
+
+    if (ret > (ssize_t)sizeof(header)) {
+        ret -= sizeof(header);
+    } else if (ret == -EAGAIN) {
+        atomic_fetch_add_explicit(&dropped, 1, memory_order_relaxed);
+    }
+
+    return ret;
+}
diff --git a/libstats/statsd_writer.h b/libstats/statsd_writer.h
new file mode 100644
index 0000000..82e14e0
--- /dev/null
+++ b/libstats/statsd_writer.h
@@ -0,0 +1,43 @@
+/*
+ * Copyright (C) 2018, The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef ANDROID_STATS_LOG_STATS_WRITER_H
+#define ANDROID_STATS_LOG_STATS_WRITER_H
+
+#include <pthread.h>
+#include <stdatomic.h>
+#include <sys/socket.h>
+
+/**
+ * Internal lock should not be exposed. This is bad design.
+ * TODO: rewrite it in c++ code and encapsulate the functionality in a
+ * StatsdWriter class.
+ */
+void statsd_writer_init_lock();
+int statsd_writer_init_trylock();
+void statsd_writer_init_unlock();
+
+struct android_log_transport_write {
+    const char* name; /* human name to describe the transport */
+    atomic_int sock;
+    int (*available)(); /* Does not cause resources to be taken */
+    int (*open)();      /* can be called multiple times, reusing current resources */
+    void (*close)();    /* free up resources */
+    /* write log to transport, returns number of bytes propagated, or -errno */
+    int (*write)(struct timespec* ts, struct iovec* vec, size_t nr);
+};
+
+#endif  // ANDROID_STATS_LOG_STATS_WRITER_H
diff --git a/libsystem/Android.bp b/libsystem/Android.bp
index 82bf1bc..2e22b43 100644
--- a/libsystem/Android.bp
+++ b/libsystem/Android.bp
@@ -1,6 +1,7 @@
 cc_library_headers {
     name: "libsystem_headers",
     vendor_available: true,
+    recovery_available: true,
     host_supported: true,
     export_include_dirs: ["include"],
 
diff --git a/libunwindstack/Android.bp b/libunwindstack/Android.bp
index d411cee..82f2e73 100644
--- a/libunwindstack/Android.bp
+++ b/libunwindstack/Android.bp
@@ -110,6 +110,10 @@
         },
     },
 
+    static_libs: [
+        "libprocinfo",
+    ],
+
     shared_libs: [
         "libbase",
         "libdexfile",
@@ -198,6 +202,7 @@
         "tests/files/offline/jit_debug_x86/*",
         "tests/files/offline/jit_map_arm/*",
         "tests/files/offline/gnu_debugdata_arm/*",
+        "tests/files/offline/offset_arm/*",
         "tests/files/offline/straddle_arm/*",
         "tests/files/offline/straddle_arm64/*",
     ],
diff --git a/libunwindstack/Elf.cpp b/libunwindstack/Elf.cpp
index 02f8a9a..3762107 100644
--- a/libunwindstack/Elf.cpp
+++ b/libunwindstack/Elf.cpp
@@ -160,14 +160,14 @@
 }
 
 // The relative pc is always relative to the start of the map from which it comes.
-bool Elf::Step(uint64_t rel_pc, uint64_t adjusted_rel_pc, uint64_t elf_offset, Regs* regs,
-               Memory* process_memory, bool* finished) {
+bool Elf::Step(uint64_t rel_pc, uint64_t adjusted_rel_pc, Regs* regs, Memory* process_memory,
+               bool* finished) {
   if (!valid_) {
     return false;
   }
 
   // The relative pc expectd by StepIfSignalHandler is relative to the start of the elf.
-  if (regs->StepIfSignalHandler(rel_pc + elf_offset, this, process_memory)) {
+  if (regs->StepIfSignalHandler(rel_pc, this, process_memory)) {
     *finished = false;
     return true;
   }
diff --git a/libunwindstack/ElfInterface.cpp b/libunwindstack/ElfInterface.cpp
index 10afe33..4c05a1b 100644
--- a/libunwindstack/ElfInterface.cpp
+++ b/libunwindstack/ElfInterface.cpp
@@ -87,8 +87,8 @@
 
   ISzAlloc alloc;
   CXzUnpacker state;
-  alloc.Alloc = [](void*, size_t size) { return malloc(size); };
-  alloc.Free = [](void*, void* ptr) { return free(ptr); };
+  alloc.Alloc = [](ISzAllocPtr, size_t size) { return malloc(size); };
+  alloc.Free = [](ISzAllocPtr, void* ptr) { return free(ptr); };
 
   XzUnpacker_Construct(&state, &alloc);
 
@@ -106,7 +106,7 @@
       dst_remaining += 2 * gnu_debugdata_size_;
     }
     return_val = XzUnpacker_Code(&state, dst->GetPtr(dst_offset), &dst_remaining, &src[src_offset],
-                                 &src_remaining, CODER_FINISH_ANY, &status);
+                                 &src_remaining, true, CODER_FINISH_ANY, &status);
     src_offset += src_remaining;
     dst_offset += dst_remaining;
   } while (return_val == SZ_OK && status == CODER_STATUS_NOT_FINISHED);
diff --git a/libunwindstack/Maps.cpp b/libunwindstack/Maps.cpp
index e1a1a71..bb682ea 100644
--- a/libunwindstack/Maps.cpp
+++ b/libunwindstack/Maps.cpp
@@ -24,6 +24,7 @@
 #include <unistd.h>
 
 #include <android-base/unique_fd.h>
+#include <procinfo/process_map.h>
 
 #include <algorithm>
 #include <cctype>
@@ -57,150 +58,16 @@
   return nullptr;
 }
 
-// Assumes that line does not end in '\n'.
-static MapInfo* InternalParseLine(const char* line) {
-  // Do not use a sscanf implementation since it is not performant.
-
-  // Example linux /proc/<pid>/maps lines:
-  // 6f000000-6f01e000 rwxp 00000000 00:0c 16389419   /system/lib/libcomposer.so
-  char* str;
-  const char* old_str = line;
-  uint64_t start = strtoull(old_str, &str, 16);
-  if (old_str == str || *str++ != '-') {
-    return nullptr;
-  }
-
-  old_str = str;
-  uint64_t end = strtoull(old_str, &str, 16);
-  if (old_str == str || !std::isspace(*str++)) {
-    return nullptr;
-  }
-
-  while (std::isspace(*str)) {
-    str++;
-  }
-
-  // Parse permissions data.
-  if (*str == '\0') {
-    return nullptr;
-  }
-  uint16_t flags = 0;
-  if (*str == 'r') {
-    flags |= PROT_READ;
-  } else if (*str != '-') {
-    return nullptr;
-  }
-  str++;
-  if (*str == 'w') {
-    flags |= PROT_WRITE;
-  } else if (*str != '-') {
-    return nullptr;
-  }
-  str++;
-  if (*str == 'x') {
-    flags |= PROT_EXEC;
-  } else if (*str != '-') {
-    return nullptr;
-  }
-  str++;
-  if (*str != 'p' && *str != 's') {
-    return nullptr;
-  }
-  str++;
-
-  if (!std::isspace(*str++)) {
-    return nullptr;
-  }
-
-  old_str = str;
-  uint64_t offset = strtoull(old_str, &str, 16);
-  if (old_str == str || !std::isspace(*str)) {
-    return nullptr;
-  }
-
-  // Ignore the 00:00 values.
-  old_str = str;
-  (void)strtoull(old_str, &str, 16);
-  if (old_str == str || *str++ != ':') {
-    return nullptr;
-  }
-  if (std::isspace(*str)) {
-    return nullptr;
-  }
-
-  // Skip the inode.
-  old_str = str;
-  (void)strtoull(str, &str, 16);
-  if (old_str == str || !std::isspace(*str++)) {
-    return nullptr;
-  }
-
-  // Skip decimal digit.
-  old_str = str;
-  (void)strtoull(old_str, &str, 10);
-  if (old_str == str || (!std::isspace(*str) && *str != '\0')) {
-    return nullptr;
-  }
-
-  while (std::isspace(*str)) {
-    str++;
-  }
-  if (*str == '\0') {
-    return new MapInfo(start, end, offset, flags, "");
-  }
-
-  // Save the name data.
-  std::string name(str);
-
-  // Mark a device map in /dev/ and not in /dev/ashmem/ specially.
-  if (name.substr(0, 5) == "/dev/" && name.substr(5, 7) != "ashmem/") {
-    flags |= MAPS_FLAGS_DEVICE_MAP;
-  }
-  return new MapInfo(start, end, offset, flags, name);
-}
-
 bool Maps::Parse() {
-  int fd = open(GetMapsFile().c_str(), O_RDONLY | O_CLOEXEC);
-  if (fd == -1) {
-    return false;
-  }
-
-  bool return_value = true;
-  char buffer[2048];
-  size_t leftover = 0;
-  while (true) {
-    ssize_t bytes = read(fd, &buffer[leftover], 2048 - leftover);
-    if (bytes == -1) {
-      return_value = false;
-      break;
-    }
-    if (bytes == 0) {
-      break;
-    }
-    bytes += leftover;
-    char* line = buffer;
-    while (bytes > 0) {
-      char* newline = static_cast<char*>(memchr(line, '\n', bytes));
-      if (newline == nullptr) {
-        memmove(buffer, line, bytes);
-        break;
-      }
-      *newline = '\0';
-
-      MapInfo* map_info = InternalParseLine(line);
-      if (map_info == nullptr) {
-        return_value = false;
-        break;
-      }
-      maps_.push_back(map_info);
-
-      bytes -= newline - line + 1;
-      line = newline + 1;
-    }
-    leftover = bytes;
-  }
-  close(fd);
-  return return_value;
+  return android::procinfo::ReadMapFile(
+      GetMapsFile(),
+      [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, const char* name) {
+        // Mark a device map in /dev/ and not in /dev/ashmem/ specially.
+        if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
+          flags |= unwindstack::MAPS_FLAGS_DEVICE_MAP;
+        }
+        maps_.push_back(new MapInfo(start, end, pgoff, flags, name));
+      });
 }
 
 void Maps::Add(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags,
@@ -222,26 +89,16 @@
 }
 
 bool BufferMaps::Parse() {
-  const char* start_of_line = buffer_;
-  do {
-    std::string line;
-    const char* end_of_line = strchr(start_of_line, '\n');
-    if (end_of_line == nullptr) {
-      line = start_of_line;
-    } else {
-      line = std::string(start_of_line, end_of_line - start_of_line);
-      end_of_line++;
-    }
-
-    MapInfo* map_info = InternalParseLine(line.c_str());
-    if (map_info == nullptr) {
-      return false;
-    }
-    maps_.push_back(map_info);
-
-    start_of_line = end_of_line;
-  } while (start_of_line != nullptr && *start_of_line != '\0');
-  return true;
+  std::string content(buffer_);
+  return android::procinfo::ReadMapFileContent(
+      &content[0],
+      [&](uint64_t start, uint64_t end, uint16_t flags, uint64_t pgoff, const char* name) {
+        // Mark a device map in /dev/ and not in /dev/ashmem/ specially.
+        if (strncmp(name, "/dev/", 5) == 0 && strncmp(name + 5, "ashmem/", 7) != 0) {
+          flags |= unwindstack::MAPS_FLAGS_DEVICE_MAP;
+        }
+        maps_.push_back(new MapInfo(start, end, pgoff, flags, name));
+      });
 }
 
 const std::string RemoteMaps::GetMapsFile() const {
diff --git a/libunwindstack/Unwinder.cpp b/libunwindstack/Unwinder.cpp
index 9a6c6df..099cc9e 100644
--- a/libunwindstack/Unwinder.cpp
+++ b/libunwindstack/Unwinder.cpp
@@ -220,8 +220,7 @@
           in_device_map = true;
         } else {
           bool finished;
-          stepped = elf->Step(rel_pc, step_pc, map_info->elf_offset, regs_, process_memory_.get(),
-                              &finished);
+          stepped = elf->Step(rel_pc, step_pc, regs_, process_memory_.get(), &finished);
           elf->GetLastError(&last_error_);
           if (stepped && finished) {
             break;
diff --git a/libunwindstack/include/unwindstack/Elf.h b/libunwindstack/include/unwindstack/Elf.h
index 385973e..f4cdbda 100644
--- a/libunwindstack/include/unwindstack/Elf.h
+++ b/libunwindstack/include/unwindstack/Elf.h
@@ -65,8 +65,8 @@
 
   uint64_t GetRelPc(uint64_t pc, const MapInfo* map_info);
 
-  bool Step(uint64_t rel_pc, uint64_t adjusted_rel_pc, uint64_t elf_offset, Regs* regs,
-            Memory* process_memory, bool* finished);
+  bool Step(uint64_t rel_pc, uint64_t adjusted_rel_pc, Regs* regs, Memory* process_memory,
+            bool* finished);
 
   ElfInterface* CreateInterfaceFromMemory(Memory* memory);
 
diff --git a/libunwindstack/include/unwindstack/MapInfo.h b/libunwindstack/include/unwindstack/MapInfo.h
index a57fe68..ac0df41 100644
--- a/libunwindstack/include/unwindstack/MapInfo.h
+++ b/libunwindstack/include/unwindstack/MapInfo.h
@@ -34,6 +34,13 @@
 struct MapInfo {
   MapInfo() = default;
   MapInfo(uint64_t start, uint64_t end) : start(start), end(end) {}
+  MapInfo(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags, const char* name)
+      : start(start),
+        end(end),
+        offset(offset),
+        flags(flags),
+        name(name),
+        load_bias(static_cast<uint64_t>(-1)) {}
   MapInfo(uint64_t start, uint64_t end, uint64_t offset, uint64_t flags, const std::string& name)
       : start(start),
         end(end),
diff --git a/libunwindstack/tests/ElfTest.cpp b/libunwindstack/tests/ElfTest.cpp
index f9028c4..aecbf6d 100644
--- a/libunwindstack/tests/ElfTest.cpp
+++ b/libunwindstack/tests/ElfTest.cpp
@@ -133,7 +133,7 @@
   ASSERT_FALSE(elf.GetFunctionName(0, &name, &func_offset));
 
   bool finished;
-  ASSERT_FALSE(elf.Step(0, 0, 0, nullptr, nullptr, &finished));
+  ASSERT_FALSE(elf.Step(0, 0, nullptr, nullptr, &finished));
 }
 
 TEST_F(ElfTest, elf32_invalid_machine) {
@@ -330,7 +330,7 @@
   elf.FakeSetValid(true);
   elf.FakeSetLoadBias(0);
   bool finished;
-  ASSERT_TRUE(elf.Step(0x1000, 0x1000, 0x2000, &regs, &process_memory, &finished));
+  ASSERT_TRUE(elf.Step(0x3000, 0x1000, &regs, &process_memory, &finished));
   EXPECT_FALSE(finished);
   EXPECT_EQ(15U, regs.pc());
   EXPECT_EQ(13U, regs.sp());
@@ -370,7 +370,7 @@
   EXPECT_CALL(*interface, Step(0x1000, 0, &regs, &process_memory, &finished))
       .WillOnce(::testing::Return(true));
 
-  ASSERT_TRUE(elf.Step(0x1004, 0x1000, 0x2000, &regs, &process_memory, &finished));
+  ASSERT_TRUE(elf.Step(0x1004, 0x1000, &regs, &process_memory, &finished));
 }
 
 TEST_F(ElfTest, step_in_interface_non_zero_load_bias) {
@@ -388,7 +388,7 @@
   EXPECT_CALL(*interface, Step(0x7300, 0x4000, &regs, &process_memory, &finished))
       .WillOnce(::testing::Return(true));
 
-  ASSERT_TRUE(elf.Step(0x7304, 0x7300, 0x2000, &regs, &process_memory, &finished));
+  ASSERT_TRUE(elf.Step(0x7304, 0x7300, &regs, &process_memory, &finished));
 }
 
 TEST_F(ElfTest, get_global_invalid_elf) {
diff --git a/libunwindstack/tests/UnwindOfflineTest.cpp b/libunwindstack/tests/UnwindOfflineTest.cpp
index 2b8f0c2..285fc9e 100644
--- a/libunwindstack/tests/UnwindOfflineTest.cpp
+++ b/libunwindstack/tests/UnwindOfflineTest.cpp
@@ -46,6 +46,12 @@
 
 namespace unwindstack {
 
+static void AddMemory(std::string file_name, MemoryOfflineParts* parts) {
+  MemoryOffline* memory = new MemoryOffline;
+  ASSERT_TRUE(memory->Init(file_name.c_str(), 0));
+  parts->Add(memory);
+}
+
 class UnwindOfflineTest : public ::testing::Test {
  protected:
   void TearDown() override {
@@ -64,9 +70,24 @@
     maps_.reset(new BufferMaps(data.c_str()));
     ASSERT_TRUE(maps_->Parse());
 
-    std::unique_ptr<MemoryOffline> stack_memory(new MemoryOffline);
-    ASSERT_TRUE(stack_memory->Init((dir_ + "stack.data").c_str(), 0));
-    process_memory_.reset(stack_memory.release());
+    std::string stack_name(dir_ + "stack.data");
+    struct stat st;
+    if (stat(stack_name.c_str(), &st) == 0 && S_ISREG(st.st_mode)) {
+      std::unique_ptr<MemoryOffline> stack_memory(new MemoryOffline);
+      ASSERT_TRUE(stack_memory->Init((dir_ + "stack.data").c_str(), 0));
+      process_memory_.reset(stack_memory.release());
+    } else {
+      std::unique_ptr<MemoryOfflineParts> stack_memory(new MemoryOfflineParts);
+      for (size_t i = 0;; i++) {
+        stack_name = dir_ + "stack" + std::to_string(i) + ".data";
+        if (stat(stack_name.c_str(), &st) == -1 || !S_ISREG(st.st_mode)) {
+          ASSERT_TRUE(i != 0) << "No stack data files found.";
+          break;
+        }
+        AddMemory(stack_name, stack_memory.get());
+      }
+      process_memory_.reset(stack_memory.release());
+    }
 
     switch (arch) {
       case ARCH_ARM: {
@@ -180,7 +201,7 @@
 }
 
 TEST_F(UnwindOfflineTest, pc_straddle_arm) {
-  Init("straddle_arm/", ARCH_ARM);
+  ASSERT_NO_FATAL_FAILURE(Init("straddle_arm/", ARCH_ARM));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -204,7 +225,7 @@
 }
 
 TEST_F(UnwindOfflineTest, pc_in_gnu_debugdata_arm) {
-  Init("gnu_debugdata_arm/", ARCH_ARM);
+  ASSERT_NO_FATAL_FAILURE(Init("gnu_debugdata_arm/", ARCH_ARM));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -224,7 +245,7 @@
 }
 
 TEST_F(UnwindOfflineTest, pc_straddle_arm64) {
-  Init("straddle_arm64/", ARCH_ARM64);
+  ASSERT_NO_FATAL_FAILURE(Init("straddle_arm64/", ARCH_ARM64));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -255,14 +276,8 @@
   EXPECT_EQ(0x7fe0d84110U, unwinder.frames()[5].sp);
 }
 
-static void AddMemory(std::string file_name, MemoryOfflineParts* parts) {
-  MemoryOffline* memory = new MemoryOffline;
-  ASSERT_TRUE(memory->Init(file_name.c_str(), 0));
-  parts->Add(memory);
-}
-
 TEST_F(UnwindOfflineTest, jit_debug_x86) {
-  Init("jit_debug_x86/", ARCH_X86);
+  ASSERT_NO_FATAL_FAILURE(Init("jit_debug_x86/", ARCH_X86));
 
   MemoryOfflineParts* memory = new MemoryOfflineParts;
   AddMemory(dir_ + "descriptor.data", memory);
@@ -555,7 +570,7 @@
 }
 
 TEST_F(UnwindOfflineTest, jit_debug_arm) {
-  Init("jit_debug_arm/", ARCH_ARM);
+  ASSERT_NO_FATAL_FAILURE(Init("jit_debug_arm/", ARCH_ARM));
 
   MemoryOfflineParts* memory = new MemoryOfflineParts;
   AddMemory(dir_ + "descriptor.data", memory);
@@ -873,7 +888,7 @@
 // fallback to iterating over the cies/fdes and ignore the eh_frame_hdr.
 // No .gnu_debugdata section in the elf file, so no symbols.
 TEST_F(UnwindOfflineTest, bad_eh_frame_hdr_arm64) {
-  Init("bad_eh_frame_hdr_arm64/", ARCH_ARM64);
+  ASSERT_NO_FATAL_FAILURE(Init("bad_eh_frame_hdr_arm64/", ARCH_ARM64));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -902,7 +917,7 @@
 // The elf has bad eh_frame unwind information for the pcs. If eh_frame
 // is used first, the unwind will not match the expected output.
 TEST_F(UnwindOfflineTest, debug_frame_first_x86) {
-  Init("debug_frame_first_x86/", ARCH_X86);
+  ASSERT_NO_FATAL_FAILURE(Init("debug_frame_first_x86/", ARCH_X86));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -930,7 +945,7 @@
 
 // Make sure that a pc that is at the beginning of an fde unwinds correctly.
 TEST_F(UnwindOfflineTest, eh_frame_hdr_begin_x86_64) {
-  Init("eh_frame_hdr_begin_x86_64/", ARCH_X86_64);
+  ASSERT_NO_FATAL_FAILURE(Init("eh_frame_hdr_begin_x86_64/", ARCH_X86_64));
 
   Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
   unwinder.Unwind();
@@ -957,7 +972,7 @@
 }
 
 TEST_F(UnwindOfflineTest, art_quick_osr_stub_arm) {
-  Init("art_quick_osr_stub_arm/", ARCH_ARM);
+  ASSERT_NO_FATAL_FAILURE(Init("art_quick_osr_stub_arm/", ARCH_ARM));
 
   MemoryOfflineParts* memory = new MemoryOfflineParts;
   AddMemory(dir_ + "descriptor.data", memory);
@@ -1072,7 +1087,7 @@
 }
 
 TEST_F(UnwindOfflineTest, jit_map_arm) {
-  Init("jit_map_arm/", ARCH_ARM);
+  ASSERT_NO_FATAL_FAILURE(Init("jit_map_arm/", ARCH_ARM));
 
   maps_->Add(0xd025c788, 0xd025c9f0, 0, PROT_READ | PROT_EXEC | MAPS_FLAGS_JIT_SYMFILE_MAP,
              "jit_map0.so", 0);
@@ -1111,4 +1126,78 @@
   EXPECT_EQ(0xcd4ff960U, unwinder.frames()[5].sp);
 }
 
+TEST_F(UnwindOfflineTest, offset_arm) {
+  ASSERT_NO_FATAL_FAILURE(Init("offset_arm/", ARCH_ARM));
+
+  Unwinder unwinder(128, maps_.get(), regs_.get(), process_memory_);
+  unwinder.Unwind();
+
+  std::string frame_info(DumpFrames(unwinder));
+  ASSERT_EQ(19U, unwinder.NumFrames()) << "Unwind:\n" << frame_info;
+  EXPECT_EQ(
+      "  #00 pc 0032bfa0 (offset 0x42000)  libunwindstack_test (SignalInnerFunction+40)\n"
+      "  #01 pc 0032bfeb (offset 0x42000)  libunwindstack_test (SignalMiddleFunction+2)\n"
+      "  #02 pc 0032bff3 (offset 0x42000)  libunwindstack_test (SignalOuterFunction+2)\n"
+      "  #03 pc 0032fed3 (offset 0x42000)  libunwindstack_test "
+      "(_ZN11unwindstackL19SignalCallerHandlerEiP7siginfoPv+26)\n"
+      "  #04 pc 00026528 (offset 0x25000)  libc.so\n"
+      "  #05 pc 00000000  <unknown>\n"
+      "  #06 pc 0032c2d9 (offset 0x42000)  libunwindstack_test (InnerFunction+736)\n"
+      "  #07 pc 0032cc4f (offset 0x42000)  libunwindstack_test (MiddleFunction+42)\n"
+      "  #08 pc 0032cc81 (offset 0x42000)  libunwindstack_test (OuterFunction+42)\n"
+      "  #09 pc 0032e547 (offset 0x42000)  libunwindstack_test "
+      "(_ZN11unwindstackL19RemoteThroughSignalEij+270)\n"
+      "  #10 pc 0032ed99 (offset 0x42000)  libunwindstack_test "
+      "(_ZN11unwindstack55UnwindTest_remote_through_signal_with_invalid_func_Test8TestBodyEv+16)\n"
+      "  #11 pc 00354453 (offset 0x42000)  libunwindstack_test (_ZN7testing4Test3RunEv+154)\n"
+      "  #12 pc 00354de7 (offset 0x42000)  libunwindstack_test (_ZN7testing8TestInfo3RunEv+194)\n"
+      "  #13 pc 00355105 (offset 0x42000)  libunwindstack_test (_ZN7testing8TestCase3RunEv+180)\n"
+      "  #14 pc 0035a215 (offset 0x42000)  libunwindstack_test "
+      "(_ZN7testing8internal12UnitTestImpl11RunAllTestsEv+664)\n"
+      "  #15 pc 00359f4f (offset 0x42000)  libunwindstack_test (_ZN7testing8UnitTest3RunEv+110)\n"
+      "  #16 pc 0034d3db (offset 0x42000)  libunwindstack_test (main+38)\n"
+      "  #17 pc 00092c0d (offset 0x25000)  libc.so (__libc_init+48)\n"
+      "  #18 pc 0004202f (offset 0x42000)  libunwindstack_test (_start_main+38)\n",
+      frame_info);
+
+  EXPECT_EQ(0x2e55fa0U, unwinder.frames()[0].pc);
+  EXPECT_EQ(0xf43d2cccU, unwinder.frames()[0].sp);
+  EXPECT_EQ(0x2e55febU, unwinder.frames()[1].pc);
+  EXPECT_EQ(0xf43d2ce0U, unwinder.frames()[1].sp);
+  EXPECT_EQ(0x2e55ff3U, unwinder.frames()[2].pc);
+  EXPECT_EQ(0xf43d2ce8U, unwinder.frames()[2].sp);
+  EXPECT_EQ(0x2e59ed3U, unwinder.frames()[3].pc);
+  EXPECT_EQ(0xf43d2cf0U, unwinder.frames()[3].sp);
+  EXPECT_EQ(0xf4136528U, unwinder.frames()[4].pc);
+  EXPECT_EQ(0xf43d2d10U, unwinder.frames()[4].sp);
+  EXPECT_EQ(0U, unwinder.frames()[5].pc);
+  EXPECT_EQ(0xffcc0ee0U, unwinder.frames()[5].sp);
+  EXPECT_EQ(0x2e562d9U, unwinder.frames()[6].pc);
+  EXPECT_EQ(0xffcc0ee0U, unwinder.frames()[6].sp);
+  EXPECT_EQ(0x2e56c4fU, unwinder.frames()[7].pc);
+  EXPECT_EQ(0xffcc1060U, unwinder.frames()[7].sp);
+  EXPECT_EQ(0x2e56c81U, unwinder.frames()[8].pc);
+  EXPECT_EQ(0xffcc1078U, unwinder.frames()[8].sp);
+  EXPECT_EQ(0x2e58547U, unwinder.frames()[9].pc);
+  EXPECT_EQ(0xffcc1090U, unwinder.frames()[9].sp);
+  EXPECT_EQ(0x2e58d99U, unwinder.frames()[10].pc);
+  EXPECT_EQ(0xffcc1438U, unwinder.frames()[10].sp);
+  EXPECT_EQ(0x2e7e453U, unwinder.frames()[11].pc);
+  EXPECT_EQ(0xffcc1448U, unwinder.frames()[11].sp);
+  EXPECT_EQ(0x2e7ede7U, unwinder.frames()[12].pc);
+  EXPECT_EQ(0xffcc1458U, unwinder.frames()[12].sp);
+  EXPECT_EQ(0x2e7f105U, unwinder.frames()[13].pc);
+  EXPECT_EQ(0xffcc1490U, unwinder.frames()[13].sp);
+  EXPECT_EQ(0x2e84215U, unwinder.frames()[14].pc);
+  EXPECT_EQ(0xffcc14c0U, unwinder.frames()[14].sp);
+  EXPECT_EQ(0x2e83f4fU, unwinder.frames()[15].pc);
+  EXPECT_EQ(0xffcc1510U, unwinder.frames()[15].sp);
+  EXPECT_EQ(0x2e773dbU, unwinder.frames()[16].pc);
+  EXPECT_EQ(0xffcc1528U, unwinder.frames()[16].sp);
+  EXPECT_EQ(0xf41a2c0dU, unwinder.frames()[17].pc);
+  EXPECT_EQ(0xffcc1540U, unwinder.frames()[17].sp);
+  EXPECT_EQ(0x2b6c02fU, unwinder.frames()[18].pc);
+  EXPECT_EQ(0xffcc1558U, unwinder.frames()[18].sp);
+}
+
 }  // namespace unwindstack
diff --git a/libunwindstack/tests/files/offline/offset_arm/libc.so b/libunwindstack/tests/files/offline/offset_arm/libc.so
new file mode 100644
index 0000000..9f5c8ca
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/libc.so
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test b/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test
new file mode 100644
index 0000000..7a30bfa
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/libunwindstack_test
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/maps.txt b/libunwindstack/tests/files/offline/offset_arm/maps.txt
new file mode 100644
index 0000000..6224464
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/maps.txt
@@ -0,0 +1,2 @@
+2b6c000-2e92000 r-xp 42000 00:00 0   libunwindstack_test
+f4135000-f41a9000 r-xp 25000 00:00 0   libc.so
diff --git a/libunwindstack/tests/files/offline/offset_arm/regs.txt b/libunwindstack/tests/files/offline/offset_arm/regs.txt
new file mode 100644
index 0000000..1f4ac8f
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/regs.txt
@@ -0,0 +1,16 @@
+r0: 5
+r1: 5
+r2: 4
+r3: 1
+r4: 73804b6b
+r5: f3c9c000
+r6: 2ea09ac
+r7: 10624dd3
+r8: f41b5d8c
+r9: f3c9c000
+r10: 6f17
+r11: f3c94048
+ip: 2ea0807
+sp: f43d2ccc
+lr: 2e55fef
+pc: 2e55fa0
diff --git a/libunwindstack/tests/files/offline/offset_arm/stack0.data b/libunwindstack/tests/files/offline/offset_arm/stack0.data
new file mode 100644
index 0000000..23a9874
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/stack0.data
Binary files differ
diff --git a/libunwindstack/tests/files/offline/offset_arm/stack1.data b/libunwindstack/tests/files/offline/offset_arm/stack1.data
new file mode 100644
index 0000000..49bdd1e
--- /dev/null
+++ b/libunwindstack/tests/files/offline/offset_arm/stack1.data
Binary files differ
diff --git a/libunwindstack/tools/unwind_for_offline.cpp b/libunwindstack/tools/unwind_for_offline.cpp
index 74868d4..589731d 100644
--- a/libunwindstack/tools/unwind_for_offline.cpp
+++ b/libunwindstack/tools/unwind_for_offline.cpp
@@ -30,6 +30,7 @@
 #include <memory>
 #include <string>
 #include <unordered_map>
+#include <utility>
 #include <vector>
 
 #include <unwindstack/Elf.h>
@@ -78,30 +79,44 @@
   return true;
 }
 
-bool SaveStack(pid_t pid, uint64_t sp_start, uint64_t sp_end) {
-  std::unique_ptr<FILE, decltype(&fclose)> fp(fopen("stack.data", "w+"), &fclose);
-  if (fp == nullptr) {
-    printf("Failed to create stack.data.\n");
-    return false;
-  }
+bool SaveStack(pid_t pid, const std::vector<std::pair<uint64_t, uint64_t>>& stacks) {
+  for (size_t i = 0; i < stacks.size(); i++) {
+    std::string file_name;
+    if (stacks.size() != 1) {
+      file_name = "stack" + std::to_string(i) + ".data";
+    } else {
+      file_name = "stack.data";
+    }
 
-  size_t bytes = fwrite(&sp_start, 1, sizeof(sp_start), fp.get());
-  if (bytes != sizeof(sp_start)) {
-    perror("Failed to write all data.");
-    return false;
-  }
+    // Do this first, so if it fails, we don't create the file.
+    uint64_t sp_start = stacks[i].first;
+    uint64_t sp_end = stacks[i].second;
+    std::vector<uint8_t> buffer(sp_end - sp_start);
+    auto process_memory = unwindstack::Memory::CreateProcessMemory(pid);
+    if (!process_memory->Read(sp_start, buffer.data(), buffer.size())) {
+      printf("Unable to read stack data.\n");
+      return false;
+    }
 
-  std::vector<uint8_t> buffer(sp_end - sp_start);
-  auto process_memory = unwindstack::Memory::CreateProcessMemory(pid);
-  if (!process_memory->Read(sp_start, buffer.data(), buffer.size())) {
-    printf("Unable to read stack data.\n");
-    return false;
-  }
+    printf("Saving the stack 0x%" PRIx64 "-0x%" PRIx64 "\n", sp_start, sp_end);
 
-  bytes = fwrite(buffer.data(), 1, buffer.size(), fp.get());
-  if (bytes != buffer.size()) {
-    printf("Failed to write all stack data: stack size %zu, written %zu\n", buffer.size(), bytes);
-    return 1;
+    std::unique_ptr<FILE, decltype(&fclose)> fp(fopen(file_name.c_str(), "w+"), &fclose);
+    if (fp == nullptr) {
+      printf("Failed to create stack.data.\n");
+      return false;
+    }
+
+    size_t bytes = fwrite(&sp_start, 1, sizeof(sp_start), fp.get());
+    if (bytes != sizeof(sp_start)) {
+      perror("Failed to write all data.");
+      return false;
+    }
+
+    bytes = fwrite(buffer.data(), 1, buffer.size(), fp.get());
+    if (bytes != buffer.size()) {
+      printf("Failed to write all stack data: stack size %zu, written %zu\n", buffer.size(), bytes);
+      return false;
+    }
   }
 
   return true;
@@ -110,17 +125,11 @@
 bool CreateElfFromMemory(std::shared_ptr<unwindstack::Memory>& memory, map_info_t* info) {
   std::string cur_name;
   if (info->name.empty()) {
-    cur_name = android::base::StringPrintf("anonymous:%" PRIx64, info->start);
+    cur_name = android::base::StringPrintf("anonymous_%" PRIx64, info->start);
   } else {
-    cur_name = basename(info->name.c_str());
-    cur_name = android::base::StringPrintf("%s:%" PRIx64, basename(info->name.c_str()), info->start);
+    cur_name = android::base::StringPrintf("%s_%" PRIx64, basename(info->name.c_str()), info->start);
   }
 
-  std::unique_ptr<FILE, decltype(&fclose)> output(fopen(cur_name.c_str(), "w+"), &fclose);
-  if (output == nullptr) {
-    printf("Cannot create %s\n", cur_name.c_str());
-    return false;
-  }
   std::vector<uint8_t> buffer(info->end - info->start);
   // If this is a mapped in file, it might not be possible to read the entire
   // map, so read all that is readable.
@@ -129,6 +138,13 @@
     printf("Cannot read data from address %" PRIx64 " length %zu\n", info->start, buffer.size());
     return false;
   }
+
+  std::unique_ptr<FILE, decltype(&fclose)> output(fopen(cur_name.c_str(), "w+"), &fclose);
+  if (output == nullptr) {
+    printf("Cannot create %s\n", cur_name.c_str());
+    return false;
+  }
+
   size_t bytes_written = fwrite(buffer.data(), 1, bytes, output.get());
   if (bytes_written != bytes) {
     printf("Failed to write all data to file: bytes read %zu, written %zu\n", bytes, bytes_written);
@@ -198,9 +214,21 @@
   unwinder.Unwind();
 
   std::unordered_map<uint64_t, map_info_t> maps_by_start;
-  uint64_t last_sp;
+  std::vector<std::pair<uint64_t, uint64_t>> stacks;
+  uint64_t sp_map_start = 0;
+  unwindstack::MapInfo* map_info = maps.Find(sp);
+  if (map_info != nullptr) {
+    stacks.emplace_back(std::make_pair(sp, map_info->end));
+    sp_map_start = map_info->start;
+  }
+
   for (auto frame : unwinder.frames()) {
-    last_sp = frame.sp;
+    map_info = maps.Find(frame.sp);
+    if (map_info != nullptr && sp_map_start != map_info->start) {
+      stacks.emplace_back(std::make_pair(frame.sp, map_info->end));
+      sp_map_start = map_info->start;
+    }
+
     if (maps_by_start.count(frame.map_start) == 0) {
       auto info = &maps_by_start[frame.map_start];
       info->start = frame.map_start;
@@ -211,7 +239,12 @@
         // Try to create the elf from memory, this will handle cases where
         // the data only exists in memory such as vdso data on x86.
         if (!CreateElfFromMemory(process_memory, info)) {
-          return 1;
+          printf("Ignoring map ");
+          if (!info->name.empty()) {
+            printf("%s\n", info->name.c_str());
+          } else {
+            printf("anonymous:%" PRIx64 "\n", info->start);
+          }
         }
       }
     }
@@ -221,7 +254,7 @@
     printf("%s\n", unwinder.FormatFrame(i).c_str());
   }
 
-  if (!SaveStack(pid, sp, last_sp)) {
+  if (!SaveStack(pid, stacks)) {
     return 1;
   }
 
diff --git a/libutils/Android.bp b/libutils/Android.bp
index 0d7925a..9395ef8 100644
--- a/libutils/Android.bp
+++ b/libutils/Android.bp
@@ -15,6 +15,7 @@
 cc_library_headers {
     name: "libutils_headers",
     vendor_available: true,
+    recovery_available: true,
     host_supported: true,
 
     header_libs: [
diff --git a/lmkd/lmkd.c b/lmkd/lmkd.c
index 80711bc..1cfef34 100644
--- a/lmkd/lmkd.c
+++ b/lmkd/lmkd.c
@@ -472,47 +472,50 @@
         return;
     }
 
-    if (params.oomadj >= 900) {
-        soft_limit_mult = 0;
-    } else if (params.oomadj >= 800) {
-        soft_limit_mult = 0;
-    } else if (params.oomadj >= 700) {
-        soft_limit_mult = 0;
-    } else if (params.oomadj >= 600) {
-        // Launcher should be perceptible, don't kill it.
-        params.oomadj = 200;
-        soft_limit_mult = 1;
-    } else if (params.oomadj >= 500) {
-        soft_limit_mult = 0;
-    } else if (params.oomadj >= 400) {
-        soft_limit_mult = 0;
-    } else if (params.oomadj >= 300) {
-        soft_limit_mult = 1;
-    } else if (params.oomadj >= 200) {
-        soft_limit_mult = 2;
-    } else if (params.oomadj >= 100) {
-        soft_limit_mult = 10;
-    } else if (params.oomadj >=   0) {
-        soft_limit_mult = 20;
-    } else {
-        // Persistent processes will have a large
-        // soft limit 512MB.
-        soft_limit_mult = 64;
+    if (low_ram_device) {
+        if (params.oomadj >= 900) {
+            soft_limit_mult = 0;
+        } else if (params.oomadj >= 800) {
+            soft_limit_mult = 0;
+        } else if (params.oomadj >= 700) {
+            soft_limit_mult = 0;
+        } else if (params.oomadj >= 600) {
+            // Launcher should be perceptible, don't kill it.
+            params.oomadj = 200;
+            soft_limit_mult = 1;
+        } else if (params.oomadj >= 500) {
+            soft_limit_mult = 0;
+        } else if (params.oomadj >= 400) {
+            soft_limit_mult = 0;
+        } else if (params.oomadj >= 300) {
+            soft_limit_mult = 1;
+        } else if (params.oomadj >= 200) {
+            soft_limit_mult = 2;
+        } else if (params.oomadj >= 100) {
+            soft_limit_mult = 10;
+        } else if (params.oomadj >=   0) {
+            soft_limit_mult = 20;
+        } else {
+            // Persistent processes will have a large
+            // soft limit 512MB.
+            soft_limit_mult = 64;
+        }
+
+        snprintf(path, sizeof(path), MEMCG_SYSFS_PATH
+                 "apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
+                 params.uid, params.pid);
+        snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
+
+        /*
+         * system_server process has no memcg under /dev/memcg/apps but should be
+         * registered with lmkd. This is the best way so far to identify it.
+         */
+        is_system_server = (params.oomadj == SYSTEM_ADJ &&
+                            (pwdrec = getpwnam("system")) != NULL &&
+                            params.uid == pwdrec->pw_uid);
+        writefilestring(path, val, !is_system_server);
     }
 
-    snprintf(path, sizeof(path), MEMCG_SYSFS_PATH "apps/uid_%d/pid_%d/memory.soft_limit_in_bytes",
-             params.uid, params.pid);
-    snprintf(val, sizeof(val), "%d", soft_limit_mult * EIGHT_MEGA);
-
-    /*
-     * system_server process has no memcg under /dev/memcg/apps but should be
-     * registered with lmkd. This is the best way so far to identify it.
-     */
-    is_system_server = (params.oomadj == SYSTEM_ADJ &&
-                        (pwdrec = getpwnam("system")) != NULL &&
-                        params.uid == pwdrec->pw_uid);
-    writefilestring(path, val, !is_system_server);
-
     procp = pid_lookup(params.pid);
     if (!procp) {
             procp = malloc(sizeof(struct proc));
@@ -1150,8 +1153,15 @@
             }
         }
 
-        if (min_score_adj == OOM_SCORE_ADJ_MAX + 1)
+        if (min_score_adj == OOM_SCORE_ADJ_MAX + 1) {
+            if (debug_process_killing) {
+                ALOGI("Ignore %s memory pressure event "
+                      "(free memory=%ldkB, cache=%ldkB, limit=%ldkB)",
+                      level_name[level], other_free * page_k, other_file * page_k,
+                      (long)lowmem_minfree[lowmem_targets_size - 1] * page_k);
+            }
             return;
+        }
 
         /* Free up enough pages to push over the highest minfree level */
         pages_to_free = lowmem_minfree[lowmem_targets_size - 1] -
diff --git a/logcat/event.logtags b/logcat/event.logtags
index 7c40a77..750761f 100644
--- a/logcat/event.logtags
+++ b/logcat/event.logtags
@@ -67,8 +67,9 @@
 # ZygoteInit class preloading ends:
 3030 boot_progress_preload_end (time|2|3)
 
-# Dalvik VM
+# Dalvik VM / ART
 20003 dvm_lock_sample (process|3),(main|1|5),(thread|3),(time|1|3),(file|3),(line|1|5),(ownerfile|3),(ownerline|1|5),(sample_percent|1|6)
+20004 art_hidden_api_access (access_method|1),(flags|1),(class|3),(member|3),(type_signature|3)
 
 75000 sqlite_mem_alarm_current (current|1|2)
 75001 sqlite_mem_alarm_max (max|1|2)
diff --git a/logd/main.cpp b/logd/main.cpp
index 4af0d21..606aa63 100644
--- a/logd/main.cpp
+++ b/logd/main.cpp
@@ -33,7 +33,6 @@
 #include <syslog.h>
 #include <unistd.h>
 
-#include <cstdbool>
 #include <memory>
 
 #include <android-base/macros.h>
diff --git a/property_service/libpropertyinfoparser/Android.bp b/property_service/libpropertyinfoparser/Android.bp
index ea9b968..70f6faa 100644
--- a/property_service/libpropertyinfoparser/Android.bp
+++ b/property_service/libpropertyinfoparser/Android.bp
@@ -2,6 +2,7 @@
     name: "libpropertyinfoparser",
     host_supported: true,
     vendor_available: true,
+    recovery_available: true,
     srcs: ["property_info_parser.cpp"],
 
     cpp_std: "experimental",
diff --git a/rootdir/Android.mk b/rootdir/Android.mk
index f488ed5..3c9e5f3 100644
--- a/rootdir/Android.mk
+++ b/rootdir/Android.mk
@@ -147,13 +147,10 @@
 bcp_md5 :=
 bcp_dep :=
 
-# If BOARD_VNDK_VERSION is defined, append PLATFORM_VNDK_VERSION to base name.
+# Append PLATFORM_VNDK_VERSION to base name.
 define append_vndk_version
 $(strip \
-  $(if $(BOARD_VNDK_VERSION), \
-    $(basename $(1)).$(PLATFORM_VNDK_VERSION)$(suffix $(1)), \
-    $(1) \
-  ) \
+  $(basename $(1)).$(PLATFORM_VNDK_VERSION)$(suffix $(1)) \
 )
 endef
 
@@ -215,31 +212,46 @@
 vndk_version_suffix :=
 endef # update_and_install_ld_config
 
+
+#######################################
+# ld.config.txt selection variables
+#
+_enforce_vndk_at_runtime := false
+ifdef BOARD_VNDK_VERSION
+  ifneq ($(BOARD_VNDK_RUNTIME_DISABLE),true)
+    _enforce_vndk_at_runtime := true
+  endif
+endif
+
+_enforce_vndk_lite_at_runtime := false
+ifeq ($(_enforce_vndk_at_runtime),false)
+  ifeq ($(PRODUCT_TREBLE_LINKER_NAMESPACES)|$(SANITIZE_TARGET),true|)
+    _enforce_vndk_lite_at_runtime := true
+  endif
+endif
+
 #######################################
 # ld.config.txt
 #
 # For VNDK enforced devices that have defined BOARD_VNDK_VERSION, use
 # "ld.config.txt" as a source file. This configuration includes strict VNDK
 # run-time restrictions for vendor process.
+#
 # Other treblized devices, that have not defined BOARD_VNDK_VERSION or that
 # have set BOARD_VNDK_RUNTIME_DISABLE to true, use "ld.config.vndk_lite.txt"
 # as a source file. This configuration does not have strict VNDK run-time
 # restrictions.
+#
 # If the device is not treblized, use "ld.config.legacy.txt" for legacy
 # namespace configuration.
+#
 include $(CLEAR_VARS)
 LOCAL_MODULE := ld.config.txt
 LOCAL_MODULE_CLASS := ETC
 LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)
 
-_enforce_vndk_at_runtime := false
-ifdef BOARD_VNDK_VERSION
-ifneq ($(BOARD_VNDK_RUNTIME_DISABLE),true)
-  _enforce_vndk_at_runtime := true
-endif
-endif
-
 ifeq ($(_enforce_vndk_at_runtime),true)
+
 # for VNDK enforced devices
 LOCAL_MODULE_STEM := $(call append_vndk_version,$(LOCAL_MODULE))
 include $(BUILD_SYSTEM)/base_rules.mk
@@ -248,37 +260,36 @@
   $(LOCAL_BUILT_MODULE),\
   $(PLATFORM_VNDK_VERSION)))
 
-else ifeq ($(PRODUCT_TREBLE_LINKER_NAMESPACES)|$(SANITIZE_TARGET),true|)
-# for treblized but VNDK non-enforced devices
-LOCAL_MODULE_STEM := $(call append_vndk_version,$(LOCAL_MODULE))
+else ifeq ($(_enforce_vndk_lite_at_runtime),true)
+
+# for treblized but VNDK lightly enforced devices
+LOCAL_MODULE_STEM := ld.config.vndk_lite.txt
 include $(BUILD_SYSTEM)/base_rules.mk
 $(eval $(call update_and_install_ld_config,\
   $(LOCAL_PATH)/etc/ld.config.vndk_lite.txt,\
   $(LOCAL_BUILT_MODULE),\
-  $(if $(BOARD_VNDK_VERSION),$(PLATFORM_VNDK_VERSION)),\
+  $(PLATFORM_VNDK_VERSION),\
   true))
 
 else
+
 # for legacy non-treblized devices
-LOCAL_SRC_FILES := etc/ld.config.legacy.txt
 LOCAL_MODULE_STEM := $(LOCAL_MODULE)
+LOCAL_SRC_FILES := etc/ld.config.legacy.txt
 include $(BUILD_PREBUILT)
 
-endif # if _enforce_vndk_at_runtime is true
+endif  # ifeq ($(_enforce_vndk_at_runtime),true)
 
-_enforce_vndk_at_runtime :=
 
 #######################################
-# ld.config.noenforce.txt
+# ld.config.vndk_lite.txt
 #
-# This file is a temporary configuration file only for GSI. Originally GSI has
-# BOARD_VNDK_VERSION defined and has strict VNDK enforcing rule based on
-# "ld.config.txt". However for the devices, that have not defined
-# BOARD_VNDK_VERSION, GSI provides this configuration file which is based on
-# "ld.config.vndk_lite.txt".
-# Do not install this file for the devices other than GSI.
+# This module is only for GSI.
+#
+ifeq ($(_enforce_vndk_lite_at_runtime),false)
+
 include $(CLEAR_VARS)
-LOCAL_MODULE := ld.config.noenforce.txt
+LOCAL_MODULE := ld.config.vndk_lite.txt
 LOCAL_MODULE_CLASS := ETC
 LOCAL_MODULE_PATH := $(TARGET_OUT_ETC)
 LOCAL_MODULE_STEM := $(LOCAL_MODULE)
@@ -289,6 +300,11 @@
   $(PLATFORM_VNDK_VERSION),\
   true))
 
+endif  # ifeq ($(_enforce_vndk_lite_at_runtime),false)
+
+_enforce_vndk_at_runtime :=
+_enforce_vndk_lite_at_runtime :=
+
 #######################################
 # llndk.libraries.txt
 include $(CLEAR_VARS)
diff --git a/rootdir/init.rc b/rootdir/init.rc
index d3504ad..197047d 100644
--- a/rootdir/init.rc
+++ b/rootdir/init.rc
@@ -419,6 +419,7 @@
     mkdir /data/misc/radio 0770 system radio
     mkdir /data/misc/sms 0770 system radio
     mkdir /data/misc/carrierid 0770 system radio
+    mkdir /data/misc/apns 0770 system radio
     mkdir /data/misc/zoneinfo 0775 system system
     mkdir /data/misc/textclassifier 0771 system system
     mkdir /data/misc/vpn 0770 system vpn