diff --git a/adb/adb.cpp b/adb/adb.cpp
index c03d7db..484e561 100644
--- a/adb/adb.cpp
+++ b/adb/adb.cpp
@@ -857,8 +857,7 @@
 #if ADB_HOST
         SendOkay(reply_fd);
 #endif
-        SendProtocolString(reply_fd, listeners);
-        return 1;
+        return SendProtocolString(reply_fd, listeners);
     }
 
     if (!strcmp(service, "killforward-all")) {
diff --git a/adb/adb.h b/adb/adb.h
index 9020fc3..59644d4 100644
--- a/adb/adb.h
+++ b/adb/adb.h
@@ -142,10 +142,10 @@
 
 void print_packet(const char *label, apacket *p);
 
-
-
-void fatal(const char *fmt, ...) __attribute__((noreturn));
-void fatal_errno(const char *fmt, ...) __attribute__((noreturn));
+// These use the system (v)fprintf, not the adb prefixed ones defined in sysdeps.h, so they
+// shouldn't be tagged with ADB_FORMAT_ARCHETYPE.
+void fatal(const char* fmt, ...) __attribute__((noreturn, format(__printf__, 1, 2)));
+void fatal_errno(const char* fmt, ...) __attribute__((noreturn, format(__printf__, 1, 2)));
 
 void handle_packet(apacket *p, atransport *t);
 
diff --git a/adb/adb_client.cpp b/adb/adb_client.cpp
index cb5e488..bbc4dc7 100644
--- a/adb/adb_client.cpp
+++ b/adb/adb_client.cpp
@@ -124,7 +124,7 @@
 
 int _adb_connect(const std::string& service, std::string* error) {
     D("_adb_connect: %s", service.c_str());
-    if (service.empty() || service.size() > 1024) {
+    if (service.empty() || service.size() > MAX_PAYLOAD_V1) {
         *error = android::base::StringPrintf("bad service name length (%zd)",
                                              service.size());
         return -1;
diff --git a/adb/adb_io.cpp b/adb/adb_io.cpp
index 176b7bd..ae16834 100644
--- a/adb/adb_io.cpp
+++ b/adb/adb_io.cpp
@@ -22,14 +22,16 @@
 
 #include <android-base/stringprintf.h>
 
+#include "adb.h"
 #include "adb_trace.h"
 #include "adb_utils.h"
 #include "sysdeps.h"
 
 bool SendProtocolString(int fd, const std::string& s) {
-    int length = s.size();
-    if (length > 0xffff) {
-        length = 0xffff;
+    unsigned int length = s.size();
+    if (length > MAX_PAYLOAD_V1 - 4) {
+        errno = EMSGSIZE;
+        return false;
     }
 
     // The cost of sending two strings outweighs the cost of formatting.
diff --git a/adb/sockets.cpp b/adb/sockets.cpp
index eb0ce85..d8e4e93 100644
--- a/adb/sockets.cpp
+++ b/adb/sockets.cpp
@@ -698,17 +698,17 @@
         p = s->pkt_first;
     }
 
-        /* don't bother if we can't decode the length */
+    /* don't bother if we can't decode the length */
     if(p->len < 4) return 0;
 
     len = unhex(p->data, 4);
-    if((len < 1) ||  (len > 1024)) {
+    if ((len < 1) || (len > MAX_PAYLOAD_V1)) {
         D("SS(%d): bad size (%d)", s->id, len);
         goto fail;
     }
 
     D("SS(%d): len is %d", s->id, len );
-        /* can't do anything until we have the full header */
+    /* can't do anything until we have the full header */
     if((len + 4) > p->len) {
         D("SS(%d): waiting for %d more bytes", s->id, len+4 - p->len);
         return 0;
diff --git a/adb/sysdeps_win32.cpp b/adb/sysdeps_win32.cpp
index 0a2a8f6..c3889b6 100644
--- a/adb/sysdeps_win32.cpp
+++ b/adb/sysdeps_win32.cpp
@@ -88,7 +88,10 @@
     _fh_socket_hook
 };
 
-#define assert(cond)  do { if (!(cond)) fatal( "assertion failed '%s' on %s:%ld\n", #cond, __FILE__, __LINE__ ); } while (0)
+#define assert(cond)                                                                       \
+    do {                                                                                   \
+        if (!(cond)) fatal("assertion failed '%s' on %s:%d\n", #cond, __FILE__, __LINE__); \
+    } while (0)
 
 std::string SystemErrorCodeToString(const DWORD error_code) {
   const int kErrorMessageBufferSize = 256;
@@ -1589,7 +1592,7 @@
 /**************************************************************************/
 /**************************************************************************/
 
-#define FATAL(x...) fatal(__FUNCTION__, x)
+#define FATAL(fmt, ...) fatal("%s: " fmt, __FUNCTION__, ##__VA_ARGS__)
 
 #if DEBUG
 static void dump_fde(fdevent *fde, const char *info)
diff --git a/adb/sysdeps_win32_test.cpp b/adb/sysdeps_win32_test.cpp
index 81923cb..1d40281 100755
--- a/adb/sysdeps_win32_test.cpp
+++ b/adb/sysdeps_win32_test.cpp
@@ -66,7 +66,7 @@
     const char* path_val = adb_getenv("PATH");
     EXPECT_NE(nullptr, path_val);
     if (path_val != nullptr) {
-        EXPECT_GT(strlen(path_val), 0);
+        EXPECT_GT(strlen(path_val), 0U);
     }
 }
 
diff --git a/base/utf8_test.cpp b/base/utf8_test.cpp
index dde7490..ae8fc8c 100755
--- a/base/utf8_test.cpp
+++ b/base/utf8_test.cpp
@@ -44,7 +44,7 @@
   // specific replacement character that UTF8ToWide() may replace the invalid
   // UTF-8 characters with because we want to allow that to change if the
   // implementation changes.
-  EXPECT_EQ(0, wide.find(L"before"));
+  EXPECT_EQ(0U, wide.find(L"before"));
   const wchar_t after_wide[] = L"after";
   EXPECT_EQ(wide.length() - (arraysize(after_wide) - 1), wide.find(after_wide));
 }
diff --git a/crash_reporter/Android.mk b/crash_reporter/Android.mk
index bc023b0..4feb72a 100644
--- a/crash_reporter/Android.mk
+++ b/crash_reporter/Android.mk
@@ -19,7 +19,6 @@
 crash_reporter_src := crash_collector.cc \
     kernel_collector.cc \
     kernel_warning_collector.cc \
-    udev_collector.cc \
     unclean_shutdown_collector.cc \
     user_collector.cc
 
@@ -29,7 +28,6 @@
     crash_reporter_logs_test.cc \
     kernel_collector_test.cc \
     testrunner.cc \
-    udev_collector_test.cc \
     unclean_shutdown_collector_test.cc \
     user_collector_test.cc
 
diff --git a/crash_reporter/crash_reporter.cc b/crash_reporter/crash_reporter.cc
index 26ffa38..b69492a 100644
--- a/crash_reporter/crash_reporter.cc
+++ b/crash_reporter/crash_reporter.cc
@@ -35,10 +35,13 @@
 
 #include "kernel_collector.h"
 #include "kernel_warning_collector.h"
-#include "udev_collector.h"
 #include "unclean_shutdown_collector.h"
 #include "user_collector.h"
 
+#if !defined(__ANDROID__)
+#include "udev_collector.h"
+#endif
+
 static const char kCrashCounterHistogram[] = "Logging.CrashCounter";
 static const char kKernelCrashDetected[] = "/var/run/kernel-crash-detected";
 static const char kUncleanShutdownDetected[] =
@@ -176,6 +179,7 @@
   return 0;
 }
 
+#if !defined(__ANDROID__)
 static int HandleUdevCrash(UdevCollector *udev_collector,
                            const std::string& udev_event) {
   // Handle a crash indicated by a udev event.
@@ -189,6 +193,7 @@
     return 1;
   return 0;
 }
+#endif
 
 static int HandleKernelWarning(KernelWarningCollector
                                *kernel_warning_collector) {
@@ -249,7 +254,11 @@
   DEFINE_bool(crash_test, false, "Crash test");
   DEFINE_string(user, "", "User crash info (pid:signal:exec_name)");
   DEFINE_bool(unclean_check, true, "Check for unclean shutdown");
+
+#if !defined(__ANDROID__)
   DEFINE_string(udev, "", "Udev event description (type:device:subsystem)");
+#endif
+
   DEFINE_bool(kernel_warning, false, "Report collected kernel warning");
   DEFINE_string(pid, "", "PID of crashing process");
   DEFINE_string(uid, "", "UID of crashing process");
@@ -279,8 +288,11 @@
   UncleanShutdownCollector unclean_shutdown_collector;
   unclean_shutdown_collector.Initialize(CountUncleanShutdown,
                                         IsFeedbackAllowed);
+
+#if !defined(__ANDROID__)
   UdevCollector udev_collector;
   udev_collector.Initialize(CountUdevCrash, IsFeedbackAllowed);
+#endif
 
   KernelWarningCollector kernel_warning_collector;
   kernel_warning_collector.Initialize(CountUdevCrash, IsFeedbackAllowed);
@@ -304,9 +316,11 @@
                                    FLAGS_generate_kernel_signature);
   }
 
+#if !defined(__ANDROID__)
   if (!FLAGS_udev.empty()) {
     return HandleUdevCrash(&udev_collector, FLAGS_udev);
   }
+#endif
 
   if (FLAGS_kernel_warning) {
     return HandleKernelWarning(&kernel_warning_collector);
diff --git a/debuggerd/backtrace.cpp b/debuggerd/backtrace.cpp
index b46f8f4..b6916e5 100644
--- a/debuggerd/backtrace.cpp
+++ b/debuggerd/backtrace.cpp
@@ -67,8 +67,7 @@
   _LOG(log, logtype::BACKTRACE, "\n----- end %d -----\n", pid);
 }
 
-static void dump_thread(
-    log_t* log, pid_t tid, bool attached, bool* detach_failed, int* total_sleep_time_usec) {
+static void dump_thread(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid) {
   char path[PATH_MAX];
   char threadnamebuf[1024];
   char* threadname = NULL;
@@ -88,56 +87,25 @@
 
   _LOG(log, logtype::BACKTRACE, "\n\"%s\" sysTid=%d\n", threadname ? threadname : "<unknown>", tid);
 
-  if (!attached && ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
-    _LOG(log, logtype::BACKTRACE, "Could not attach to thread: %s\n", strerror(errno));
-    return;
-  }
-
-  if (!attached && wait_for_sigstop(tid, total_sleep_time_usec, detach_failed) == -1) {
-    return;
-  }
-
-  std::unique_ptr<Backtrace> backtrace(Backtrace::Create(tid, BACKTRACE_CURRENT_THREAD));
+  std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
   if (backtrace->Unwind(0)) {
     dump_backtrace_to_log(backtrace.get(), log, "  ");
   } else {
     ALOGE("Unwind failed: tid = %d", tid);
   }
-
-  if (!attached && ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
-    ALOGE("ptrace detach from %d failed: %s\n", tid, strerror(errno));
-    *detach_failed = true;
-  }
 }
 
-void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
-                    int* total_sleep_time_usec) {
+void dump_backtrace(int fd, int amfd, BacktraceMap* map, pid_t pid, pid_t tid,
+                    const std::set<pid_t>& siblings) {
   log_t log;
   log.tfd = fd;
   log.amfd = amfd;
 
   dump_process_header(&log, pid);
-  dump_thread(&log, tid, true, detach_failed, total_sleep_time_usec);
+  dump_thread(&log, map, pid, tid);
 
-  char task_path[64];
-  snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
-  DIR* d = opendir(task_path);
-  if (d != NULL) {
-    struct dirent* de = NULL;
-    while ((de = readdir(d)) != NULL) {
-      if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
-        continue;
-      }
-
-      char* end;
-      pid_t new_tid = strtoul(de->d_name, &end, 10);
-      if (*end || new_tid == tid) {
-        continue;
-      }
-
-      dump_thread(&log, new_tid, false, detach_failed, total_sleep_time_usec);
-    }
-    closedir(d);
+  for (pid_t sibling : siblings) {
+    dump_thread(&log, map, pid, sibling);
   }
 
   dump_process_footer(&log, pid);
diff --git a/debuggerd/backtrace.h b/debuggerd/backtrace.h
index da14cd4..98c433b 100644
--- a/debuggerd/backtrace.h
+++ b/debuggerd/backtrace.h
@@ -19,14 +19,17 @@
 
 #include <sys/types.h>
 
+#include <set>
+
 #include "utility.h"
 
 class Backtrace;
+class BacktraceMap;
 
 // Dumps a backtrace using a format similar to what Dalvik uses so that the result
 // can be intermixed in a bug report.
-void dump_backtrace(int fd, int amfd, pid_t pid, pid_t tid, bool* detach_failed,
-                    int* total_sleep_time_usec);
+void dump_backtrace(int fd, int amfd, BacktraceMap* map, pid_t pid, pid_t tid,
+                    const std::set<pid_t>& siblings);
 
 /* Dumps the backtrace in the backtrace data structure to the log. */
 void dump_backtrace_to_log(Backtrace* backtrace, log_t* log, const char* prefix);
diff --git a/debuggerd/debuggerd.cpp b/debuggerd/debuggerd.cpp
index 58b629b..8efbacc 100644
--- a/debuggerd/debuggerd.cpp
+++ b/debuggerd/debuggerd.cpp
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-#include <stdio.h>
-#include <errno.h>
-#include <signal.h>
-#include <pthread.h>
-#include <stdarg.h>
-#include <fcntl.h>
-#include <sys/types.h>
 #include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <pthread.h>
+#include <signal.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/types.h>
 #include <time.h>
 
 #include <elf.h>
@@ -31,6 +31,8 @@
 #include <sys/stat.h>
 #include <sys/wait.h>
 
+#include <set>
+
 #include <selinux/android.h>
 
 #include <log/logger.h>
@@ -71,7 +73,7 @@
         "* Process %d has been suspended while crashing.\n"
         "* To attach gdbserver and start gdb, run this on the host:\n"
         "*\n"
-        "*     gdbclient %d\n"
+        "*     gdbclient.py -p %d\n"
         "*\n"
         "* Wait for gdb to start, then press the VOLUME DOWN key\n"
         "* to let the process continue crashing.\n"
@@ -79,16 +81,13 @@
         request.pid, request.tid);
 
   // Wait for VOLUME DOWN.
-  if (init_getevent() == 0) {
-    while (true) {
-      input_event e;
-      if (get_event(&e, -1) == 0) {
-        if (e.type == EV_KEY && e.code == KEY_VOLUMEDOWN && e.value == 0) {
-          break;
-        }
+  while (true) {
+    input_event e;
+    if (get_event(&e, -1) == 0) {
+      if (e.type == EV_KEY && e.code == KEY_VOLUMEDOWN && e.value == 0) {
+        break;
       }
     }
-    uninit_getevent();
   }
 
   ALOGI("debuggerd resuming process %d", request.pid);
@@ -335,6 +334,180 @@
 }
 #endif
 
+static void ptrace_siblings(pid_t pid, pid_t main_tid, std::set<pid_t>& tids) {
+  char task_path[64];
+
+  snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
+
+  std::unique_ptr<DIR, int (*)(DIR*)> d(opendir(task_path), closedir);
+
+  // Bail early if the task directory cannot be opened.
+  if (!d) {
+    ALOGE("debuggerd: failed to open /proc/%d/task: %s", pid, strerror(errno));
+    return;
+  }
+
+  struct dirent* de;
+  while ((de = readdir(d.get())) != NULL) {
+    // Ignore "." and "..".
+    if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
+      continue;
+    }
+
+    char* end;
+    pid_t tid = strtoul(de->d_name, &end, 10);
+    if (*end) {
+      continue;
+    }
+
+    if (tid == main_tid) {
+      continue;
+    }
+
+    if (ptrace(PTRACE_ATTACH, tid, 0, 0) < 0) {
+      ALOGE("debuggerd: ptrace attach to %d failed: %s", tid, strerror(errno));
+      continue;
+    }
+
+    tids.insert(tid);
+  }
+}
+
+static bool perform_dump(const debugger_request_t& request, int fd, int tombstone_fd,
+                         BacktraceMap* backtrace_map, const std::set<pid_t>& siblings) {
+  if (TEMP_FAILURE_RETRY(write(fd, "\0", 1)) != 1) {
+    ALOGE("debuggerd: failed to respond to client: %s\n", strerror(errno));
+    return false;
+  }
+
+  int total_sleep_time_usec = 0;
+  while (true) {
+    int signal = wait_for_signal(request.tid, &total_sleep_time_usec);
+    switch (signal) {
+      case -1:
+        ALOGE("debuggerd: timed out waiting for signal");
+        return false;
+
+      case SIGSTOP:
+        if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
+          ALOGV("debuggerd: stopped -- dumping to tombstone");
+          engrave_tombstone(tombstone_fd, backtrace_map, request.pid, request.tid, siblings, signal,
+                            request.original_si_code, request.abort_msg_address);
+        } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) {
+          ALOGV("debuggerd: stopped -- dumping to fd");
+          dump_backtrace(fd, -1, backtrace_map, request.pid, request.tid, siblings);
+        } else {
+          ALOGV("debuggerd: stopped -- continuing");
+          if (ptrace(PTRACE_CONT, request.tid, 0, 0) != 0) {
+            ALOGE("debuggerd: ptrace continue failed: %s", strerror(errno));
+            return false;
+          }
+          continue;  // loop again
+        }
+        break;
+
+      case SIGABRT:
+      case SIGBUS:
+      case SIGFPE:
+      case SIGILL:
+      case SIGSEGV:
+#ifdef SIGSTKFLT
+      case SIGSTKFLT:
+#endif
+      case SIGTRAP:
+        ALOGV("stopped -- fatal signal\n");
+        // Send a SIGSTOP to the process to make all of
+        // the non-signaled threads stop moving.  Without
+        // this we get a lot of "ptrace detach failed:
+        // No such process".
+        kill(request.pid, SIGSTOP);
+        engrave_tombstone(tombstone_fd, backtrace_map, request.pid, request.tid, siblings, signal,
+                          request.original_si_code, request.abort_msg_address);
+        break;
+
+      default:
+        ALOGE("debuggerd: process stopped due to unexpected signal %d\n", signal);
+        break;
+    }
+    break;
+  }
+
+  return true;
+}
+
+static bool drop_privileges() {
+  if (setresgid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
+    ALOGE("debuggerd: failed to setresgid");
+    return false;
+  }
+
+  if (setresuid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
+    ALOGE("debuggerd: failed to setresuid");
+    return false;
+  }
+
+  return true;
+}
+
+static bool fork_signal_sender(int* in_fd, int* out_fd, pid_t* sender_pid, pid_t target_pid) {
+  int input_pipe[2];
+  int output_pipe[2];
+  if (pipe(input_pipe) != 0) {
+    ALOGE("debuggerd: failed to create input pipe for signal sender: %s", strerror(errno));
+    return false;
+  }
+
+  if (pipe(output_pipe) != 0) {
+    close(input_pipe[0]);
+    close(input_pipe[1]);
+    ALOGE("debuggerd: failed to create output pipe for signal sender: %s", strerror(errno));
+    return false;
+  }
+
+  pid_t fork_pid = fork();
+  if (fork_pid == -1) {
+    ALOGE("debuggerd: failed to initialize signal sender: fork failed: %s", strerror(errno));
+    return false;
+  } else if (fork_pid == 0) {
+    close(input_pipe[1]);
+    close(output_pipe[0]);
+    auto wait = [=]() {
+      char buf[1];
+      if (TEMP_FAILURE_RETRY(read(input_pipe[0], buf, 1)) != 1) {
+        ALOGE("debuggerd: signal sender failed to read from pipe");
+        exit(1);
+      }
+    };
+    auto notify_done = [=]() {
+      if (TEMP_FAILURE_RETRY(write(output_pipe[1], "", 1)) != 1) {
+        ALOGE("debuggerd: signal sender failed to write to pipe");
+        exit(1);
+      }
+    };
+
+    wait();
+    if (kill(target_pid, SIGSTOP) != 0) {
+      ALOGE("debuggerd: failed to stop target '%d': %s", target_pid, strerror(errno));
+    }
+    notify_done();
+
+    wait();
+    if (kill(target_pid, SIGCONT) != 0) {
+      ALOGE("debuggerd: failed to resume target '%d': %s", target_pid, strerror(errno));
+    }
+    notify_done();
+
+    exit(0);
+  } else {
+    close(input_pipe[0]);
+    close(output_pipe[1]);
+    *in_fd = input_pipe[1];
+    *out_fd = output_pipe[0];
+    *sender_pid = fork_pid;
+    return true;
+  }
+}
+
 static void handle_request(int fd) {
   ALOGV("handle_request(%d)\n", fd);
 
@@ -405,117 +578,88 @@
   // ensure that it can run as soon as we call PTRACE_CONT below.
   // See details in bionic/libc/linker/debugger.c, in function
   // debugger_signal_handler().
-  if (ptrace(PTRACE_ATTACH, request.tid, 0, 0)) {
-    ALOGE("debuggerd: ptrace attach failed: %s\n", strerror(errno));
+
+  // Attach to the target process.
+  if (ptrace(PTRACE_ATTACH, request.tid, 0, 0) != 0) {
+    ALOGE("debuggerd: ptrace attach failed: %s", strerror(errno));
     exit(1);
   }
 
+  // Don't attach to the sibling threads if we want to attach gdb.
+  // Supposedly, it makes the process less reliable.
+  bool attach_gdb = should_attach_gdb(&request);
+  int signal_in_fd = -1;
+  int signal_out_fd = -1;
+  pid_t signal_pid = 0;
+  if (attach_gdb) {
+    // Open all of the input devices we need to listen for VOLUMEDOWN before dropping privileges.
+    if (init_getevent() != 0) {
+      ALOGE("debuggerd: failed to initialize input device, not waiting for gdb");
+      attach_gdb = false;
+    }
+
+    // Fork a process that stays root, and listens on a pipe to pause and resume the target.
+    if (!fork_signal_sender(&signal_in_fd, &signal_out_fd, &signal_pid, request.pid)) {
+      attach_gdb = false;
+    }
+  }
+
+  auto notify_signal_sender = [=]() {
+    char buf[1];
+    if (TEMP_FAILURE_RETRY(write(signal_in_fd, "", 1)) != 1) {
+      ALOGE("debuggerd: failed to notify signal process: %s", strerror(errno));
+    } else if (TEMP_FAILURE_RETRY(read(signal_out_fd, buf, 1)) != 1) {
+      ALOGE("debuggerd: failed to read response from signal process: %s", strerror(errno));
+    }
+  };
+
+  std::set<pid_t> siblings;
+  if (!attach_gdb) {
+    ptrace_siblings(request.pid, request.tid, siblings);
+  }
+
   // Generate the backtrace map before dropping privileges.
   std::unique_ptr<BacktraceMap> backtrace_map(BacktraceMap::Create(request.pid));
 
+  bool succeeded = false;
+
   // Now that we've done everything that requires privileges, we can drop them.
-  if (setresgid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
-    ALOGE("debuggerd: failed to setresgid");
-    exit(1);
-  }
-
-  if (setresuid(AID_DEBUGGERD, AID_DEBUGGERD, AID_DEBUGGERD) != 0) {
-    ALOGE("debuggerd: failed to setresuid");
-    exit(1);
-  }
-
-  bool detach_failed = false;
-  bool tid_unresponsive = false;
-  bool attach_gdb = should_attach_gdb(&request);
-  if (TEMP_FAILURE_RETRY(write(fd, "\0", 1)) != 1) {
-    ALOGE("debuggerd: failed to respond to client: %s\n", strerror(errno));
-    exit(1);
-  }
-
-  int total_sleep_time_usec = 0;
-  while (true) {
-    int signal = wait_for_sigstop(request.tid, &total_sleep_time_usec, &detach_failed);
-    if (signal == -1) {
-      tid_unresponsive = true;
-      break;
-    }
-
-    switch (signal) {
-      case SIGSTOP:
-        if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
-          ALOGV("stopped -- dumping to tombstone\n");
-          engrave_tombstone(tombstone_fd, backtrace_map.get(), request.pid, request.tid, signal,
-                            request.original_si_code, request.abort_msg_address, true,
-                            &detach_failed, &total_sleep_time_usec);
-        } else if (request.action == DEBUGGER_ACTION_DUMP_BACKTRACE) {
-          ALOGV("stopped -- dumping to fd\n");
-          dump_backtrace(fd, -1, request.pid, request.tid, &detach_failed, &total_sleep_time_usec);
-        } else {
-          ALOGV("stopped -- continuing\n");
-          status = ptrace(PTRACE_CONT, request.tid, 0, 0);
-          if (status) {
-            ALOGE("debuggerd: ptrace continue failed: %s\n", strerror(errno));
-          }
-          continue;  // loop again
+  if (drop_privileges()) {
+    succeeded = perform_dump(request, fd, tombstone_fd, backtrace_map.get(), siblings);
+    if (succeeded) {
+      if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
+        if (!tombstone_path.empty()) {
+          write(fd, tombstone_path.c_str(), tombstone_path.length());
         }
-        break;
-
-      case SIGABRT:
-      case SIGBUS:
-      case SIGFPE:
-      case SIGILL:
-      case SIGSEGV:
-#ifdef SIGSTKFLT
-      case SIGSTKFLT:
-#endif
-      case SIGTRAP:
-        ALOGV("stopped -- fatal signal\n");
-        // Send a SIGSTOP to the process to make all of
-        // the non-signaled threads stop moving.  Without
-        // this we get a lot of "ptrace detach failed:
-        // No such process".
-        kill(request.pid, SIGSTOP);
-        // don't dump sibling threads when attaching to GDB because it
-        // makes the process less reliable, apparently...
-        engrave_tombstone(tombstone_fd, backtrace_map.get(), request.pid, request.tid, signal,
-                          request.original_si_code, request.abort_msg_address, !attach_gdb,
-                          &detach_failed, &total_sleep_time_usec);
-        break;
-
-      default:
-        ALOGE("debuggerd: process stopped due to unexpected signal %d\n", signal);
-        break;
+      }
     }
-    break;
-  }
 
-  if (request.action == DEBUGGER_ACTION_DUMP_TOMBSTONE) {
-    if (!tombstone_path.empty()) {
-      write(fd, tombstone_path.c_str(), tombstone_path.length());
-    }
-  }
-
-  if (!tid_unresponsive) {
-    ALOGV("detaching");
     if (attach_gdb) {
-      // stop the process so we can debug
-      kill(request.pid, SIGSTOP);
-    }
-    if (ptrace(PTRACE_DETACH, request.tid, 0, 0)) {
-      ALOGE("debuggerd: ptrace detach from %d failed: %s", request.tid, strerror(errno));
-      detach_failed = true;
-    } else if (attach_gdb) {
-      // if debug.db.uid is set, its value indicates if we should wait
-      // for user action for the crashing process.
-      // in this case, we log a message and turn the debug LED on
-      // waiting for a gdb connection (for instance)
-      wait_for_user_action(request);
+      // Tell the signal process to send SIGSTOP to the target.
+      notify_signal_sender();
     }
   }
 
-  // Resume the stopped process so it can crash in peace, and exit.
-  kill(request.pid, SIGCONT);
-  exit(0);
+  if (ptrace(PTRACE_DETACH, request.tid, 0, 0) != 0) {
+    ALOGE("debuggerd: ptrace detach from %d failed: %s", request.tid, strerror(errno));
+  }
+
+  for (pid_t sibling : siblings) {
+    ptrace(PTRACE_DETACH, sibling, 0, 0);
+  }
+
+  // Wait for gdb, if requested.
+  if (attach_gdb && succeeded) {
+    wait_for_user_action(request);
+
+    // Tell the signal process to send SIGCONT to the target.
+    notify_signal_sender();
+
+    uninit_getevent();
+    waitpid(signal_pid, nullptr, 0);
+  }
+
+  exit(!succeeded);
 }
 
 static int do_server() {
diff --git a/debuggerd/tombstone.cpp b/debuggerd/tombstone.cpp
index b2f203d..dda6677 100644
--- a/debuggerd/tombstone.cpp
+++ b/debuggerd/tombstone.cpp
@@ -328,6 +328,33 @@
   return addr_str;
 }
 
+static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
+  if (address == 0) {
+    return;
+  }
+
+  address += sizeof(size_t);  // Skip the buffer length.
+
+  char msg[512];
+  memset(msg, 0, sizeof(msg));
+  char* p = &msg[0];
+  while (p < &msg[sizeof(msg)]) {
+    word_t data;
+    size_t len = sizeof(word_t);
+    if (!backtrace->ReadWord(address, &data)) {
+      break;
+    }
+    address += sizeof(word_t);
+
+    while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0) {
+      len--;
+    }
+  }
+  msg[sizeof(msg) - 1] = '\0';
+
+  _LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
+}
+
 static void dump_all_maps(Backtrace* backtrace, BacktraceMap* map, log_t* log, pid_t tid) {
   bool print_fault_address_marker = false;
   uintptr_t addr = 0;
@@ -416,67 +443,37 @@
   }
 }
 
-// Return true if some thread is not detached cleanly
-static bool dump_sibling_thread_report(
-    log_t* log, pid_t pid, pid_t tid, int* total_sleep_time_usec, BacktraceMap* map) {
-  char task_path[64];
-
-  snprintf(task_path, sizeof(task_path), "/proc/%d/task", pid);
-
-  DIR* d = opendir(task_path);
-  // Bail early if the task directory cannot be opened
-  if (d == NULL) {
-    ALOGE("Cannot open /proc/%d/task\n", pid);
-    return false;
-  }
-
-  bool detach_failed = false;
-  struct dirent* de;
-  while ((de = readdir(d)) != NULL) {
-    // Ignore "." and ".."
-    if (!strcmp(de->d_name, ".") || !strcmp(de->d_name, "..")) {
-      continue;
-    }
-
-    // The main thread at fault has been handled individually
-    char* end;
-    pid_t new_tid = strtoul(de->d_name, &end, 10);
-    if (*end || new_tid == tid) {
-      continue;
-    }
-
-    // Skip this thread if cannot ptrace it
-    if (ptrace(PTRACE_ATTACH, new_tid, 0, 0) < 0) {
-      ALOGE("ptrace attach to %d failed: %s\n", new_tid, strerror(errno));
-      continue;
-    }
-
-    if (wait_for_sigstop(new_tid, total_sleep_time_usec, &detach_failed) == -1) {
-      continue;
-    }
-
-    log->current_tid = new_tid;
+static void dump_thread(log_t* log, pid_t pid, pid_t tid, BacktraceMap* map, int signal,
+                        int si_code, uintptr_t abort_msg_address, bool primary_thread) {
+  log->current_tid = tid;
+  if (!primary_thread) {
     _LOG(log, logtype::THREAD, "--- --- --- --- --- --- --- --- --- --- --- --- --- --- --- ---\n");
-    dump_thread_info(log, pid, new_tid);
+  }
+  dump_thread_info(log, pid, tid);
 
-    dump_registers(log, new_tid);
-    std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, new_tid, map));
-    if (backtrace->Unwind(0)) {
-      dump_backtrace_and_stack(backtrace.get(), log);
-    } else {
-      ALOGE("Unwind of sibling failed: pid = %d, tid = %d", pid, new_tid);
-    }
+  if (signal) {
+    dump_signal_info(log, tid, signal, si_code);
+  }
 
-    log->current_tid = log->crashed_tid;
+  std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
+  if (primary_thread) {
+    dump_abort_message(backtrace.get(), log, abort_msg_address);
+  }
+  dump_registers(log, tid);
+  if (backtrace->Unwind(0)) {
+    dump_backtrace_and_stack(backtrace.get(), log);
+  } else {
+    ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
+  }
 
-    if (ptrace(PTRACE_DETACH, new_tid, 0, 0) != 0) {
-      ALOGE("ptrace detach from %d failed: %s\n", new_tid, strerror(errno));
-      detach_failed = true;
+  if (primary_thread) {
+    dump_memory_and_code(log, backtrace.get());
+    if (map) {
+      dump_all_maps(backtrace.get(), map, log, tid);
     }
   }
 
-  closedir(d);
-  return detach_failed;
+  log->current_tid = log->crashed_tid;
 }
 
 // Reads the contents of the specified log device, filters out the entries
@@ -605,36 +602,10 @@
   dump_log_file(log, pid, "main", tail);
 }
 
-static void dump_abort_message(Backtrace* backtrace, log_t* log, uintptr_t address) {
-  if (address == 0) {
-    return;
-  }
-
-  address += sizeof(size_t); // Skip the buffer length.
-
-  char msg[512];
-  memset(msg, 0, sizeof(msg));
-  char* p = &msg[0];
-  while (p < &msg[sizeof(msg)]) {
-    word_t data;
-    size_t len = sizeof(word_t);
-    if (!backtrace->ReadWord(address, &data)) {
-      break;
-    }
-    address += sizeof(word_t);
-
-    while (len > 0 && (*p++ = (data >> (sizeof(word_t) - len) * 8) & 0xff) != 0)
-       len--;
-  }
-  msg[sizeof(msg) - 1] = '\0';
-
-  _LOG(log, logtype::HEADER, "Abort message: '%s'\n", msg);
-}
-
 // Dumps all information about the specified pid to the tombstone.
-static bool dump_crash(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid, int signal, int si_code,
-                       uintptr_t abort_msg_address, bool dump_sibling_threads,
-                       int* total_sleep_time_usec) {
+static void dump_crash(log_t* log, BacktraceMap* map, pid_t pid, pid_t tid,
+                       const std::set<pid_t>& siblings, int signal, int si_code,
+                       uintptr_t abort_msg_address) {
   // don't copy log messages to tombstone unless this is a dev device
   char value[PROPERTY_VALUE_MAX];
   property_get("ro.debuggable", value, "0");
@@ -653,32 +624,15 @@
   _LOG(log, logtype::HEADER,
        "*** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***\n");
   dump_header_info(log);
-  dump_thread_info(log, pid, tid);
-
-  if (signal) {
-    dump_signal_info(log, tid, signal, si_code);
-  }
-
-  std::unique_ptr<Backtrace> backtrace(Backtrace::Create(pid, tid, map));
-  dump_abort_message(backtrace.get(), log, abort_msg_address);
-  dump_registers(log, tid);
-  if (backtrace->Unwind(0)) {
-    dump_backtrace_and_stack(backtrace.get(), log);
-  } else {
-    ALOGE("Unwind failed: pid = %d, tid = %d", pid, tid);
-  }
-  dump_memory_and_code(log, backtrace.get());
-  if (map) {
-    dump_all_maps(backtrace.get(), map, log, tid);
-  }
-
+  dump_thread(log, pid, tid, map, signal, si_code, abort_msg_address, true);
   if (want_logs) {
     dump_logs(log, pid, 5);
   }
 
-  bool detach_failed = false;
-  if (dump_sibling_threads) {
-    detach_failed = dump_sibling_thread_report(log, pid, tid, total_sleep_time_usec, map);
+  if (!siblings.empty()) {
+    for (pid_t sibling : siblings) {
+      dump_thread(log, pid, sibling, map, 0, 0, 0, false);
+    }
   }
 
   if (want_logs) {
@@ -694,7 +648,7 @@
     TEMP_FAILURE_RETRY( read(log->amfd, &eodMarker, 1) );
   }
 
-  return detach_failed;
+  return;
 }
 
 // open_tombstone - find an available tombstone slot, if any, of the
@@ -780,16 +734,15 @@
   return amfd;
 }
 
-void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid, int signal,
-                       int original_si_code, uintptr_t abort_msg_address, bool dump_sibling_threads,
-                       bool* detach_failed, int* total_sleep_time_usec) {
+void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid,
+                       const std::set<pid_t>& siblings, int signal, int original_si_code,
+                       uintptr_t abort_msg_address) {
   log_t log;
   log.current_tid = tid;
   log.crashed_tid = tid;
 
   if (tombstone_fd < 0) {
     ALOGE("debuggerd: skipping tombstone write, nothing to do.\n");
-    *detach_failed = false;
     return;
   }
 
@@ -798,8 +751,7 @@
   // being closed.
   int amfd = activity_manager_connect();
   log.amfd = amfd;
-  *detach_failed = dump_crash(&log, map, pid, tid, signal, original_si_code, abort_msg_address,
-                              dump_sibling_threads, total_sleep_time_usec);
+  dump_crash(&log, map, pid, tid, siblings, signal, original_si_code, abort_msg_address);
 
   // This file descriptor can be -1, any error is ignored.
   close(amfd);
diff --git a/debuggerd/tombstone.h b/debuggerd/tombstone.h
index 5f2d239..2b8b8be 100644
--- a/debuggerd/tombstone.h
+++ b/debuggerd/tombstone.h
@@ -20,6 +20,7 @@
 #include <stdbool.h>
 #include <stddef.h>
 #include <sys/types.h>
+#include <set>
 #include <string>
 
 class BacktraceMap;
@@ -30,10 +31,9 @@
  */
 int open_tombstone(std::string* path);
 
-/* Creates a tombstone file and writes the crash dump to it.
- * Returns the path of the tombstone, which must be freed using free(). */
-void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid, int signal,
-                       int original_si_code, uintptr_t abort_msg_address, bool dump_sibling_threads,
-                       bool* detach_failed, int* total_sleep_time_usec);
+/* Creates a tombstone file and writes the crash dump to it. */
+void engrave_tombstone(int tombstone_fd, BacktraceMap* map, pid_t pid, pid_t tid,
+                       const std::set<pid_t>& siblings, int signal, int original_si_code,
+                       uintptr_t abort_msg_address);
 
 #endif // _DEBUGGERD_TOMBSTONE_H
diff --git a/debuggerd/utility.cpp b/debuggerd/utility.cpp
index ce214f9..cd252ce 100644
--- a/debuggerd/utility.cpp
+++ b/debuggerd/utility.cpp
@@ -30,8 +30,8 @@
 #include <backtrace/Backtrace.h>
 #include <log/log.h>
 
-const int SLEEP_TIME_USEC = 50000;         // 0.05 seconds
-const int MAX_TOTAL_SLEEP_USEC = 10000000; // 10 seconds
+constexpr int SLEEP_TIME_USEC = 50000;          // 0.05 seconds
+constexpr int MAX_TOTAL_SLEEP_USEC = 10000000;  // 10 seconds
 
 // Whitelist output desired in the logcat output.
 bool is_allowed_in_logcat(enum logtype ltype) {
@@ -78,14 +78,13 @@
   }
 }
 
-int wait_for_sigstop(pid_t tid, int* total_sleep_time_usec, bool* detach_failed) {
-  bool allow_dead_tid = false;
-  for (;;) {
+int wait_for_signal(pid_t tid, int* total_sleep_time_usec) {
+  while (true) {
     int status;
     pid_t n = TEMP_FAILURE_RETRY(waitpid(tid, &status, __WALL | WNOHANG));
     if (n == -1) {
       ALOGE("waitpid failed: tid %d, %s", tid, strerror(errno));
-      break;
+      return -1;
     } else if (n == tid) {
       if (WIFSTOPPED(status)) {
         return WSTOPSIG(status);
@@ -93,29 +92,18 @@
         ALOGE("unexpected waitpid response: n=%d, status=%08x\n", n, status);
         // This is the only circumstance under which we can allow a detach
         // to fail with ESRCH, which indicates the tid has exited.
-        allow_dead_tid = true;
-        break;
+        return -1;
       }
     }
 
     if (*total_sleep_time_usec > MAX_TOTAL_SLEEP_USEC) {
       ALOGE("timed out waiting for stop signal: tid=%d", tid);
-      break;
+      return -1;
     }
 
     usleep(SLEEP_TIME_USEC);
     *total_sleep_time_usec += SLEEP_TIME_USEC;
   }
-
-  if (ptrace(PTRACE_DETACH, tid, 0, 0) != 0) {
-    if (allow_dead_tid && errno == ESRCH) {
-      ALOGE("tid exited before attach completed: tid %d", tid);
-    } else {
-      *detach_failed = true;
-      ALOGE("detach failed: tid %d, %s", tid, strerror(errno));
-    }
-  }
-  return -1;
 }
 
 #define MEMORY_BYTES_TO_DUMP 256
diff --git a/debuggerd/utility.h b/debuggerd/utility.h
index 8bef192..ed08ddc 100644
--- a/debuggerd/utility.h
+++ b/debuggerd/utility.h
@@ -74,7 +74,7 @@
 void _LOG(log_t* log, logtype ltype, const char *fmt, ...)
         __attribute__ ((format(printf, 3, 4)));
 
-int wait_for_sigstop(pid_t, int*, bool*);
+int wait_for_signal(pid_t tid, int* total_sleep_time_usec);
 
 void dump_memory(log_t* log, Backtrace* backtrace, uintptr_t addr, const char* fmt, ...);
 
diff --git a/include/log/log.h b/include/log/log.h
index 3d9240d..1bd9165 100644
--- a/include/log/log.h
+++ b/include/log/log.h
@@ -585,14 +585,6 @@
     (__android_log_is_loggable(prio, tag, ANDROID_LOG_VERBOSE) != 0)
 #endif
 
-// TODO: remove these prototypes and their users
-#define android_writevLog(vec,num) do{}while(0)
-#define android_write1Log(str,len) do{}while (0)
-#define android_setMinPriority(tag, prio) do{}while(0)
-//#define android_logToCallback(func) do{}while(0)
-#define android_logToFile(tag, file) (0)
-#define android_logToFd(tag, fd) (0)
-
 typedef enum log_id {
     LOG_ID_MIN = 0,
 
diff --git a/include/ziparchive/zip_archive_stream_entry.h b/include/ziparchive/zip_archive_stream_entry.h
new file mode 100644
index 0000000..a40b799
--- /dev/null
+++ b/include/ziparchive/zip_archive_stream_entry.h
@@ -0,0 +1,46 @@
+/*
+ * 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.
+ */
+
+// Read-only stream access to Zip archives entries.
+#ifndef LIBZIPARCHIVE_ZIPARCHIVESTREAMENTRY_H_
+#define LIBZIPARCHIVE_ZIPARCHIVESTREAMENTRY_H_
+
+#include <vector>
+
+#include <ziparchive/zip_archive.h>
+
+class ZipArchiveStreamEntry {
+ public:
+  virtual ~ZipArchiveStreamEntry() {}
+
+  virtual const std::vector<uint8_t>* Read() = 0;
+
+  virtual bool Verify() = 0;
+
+  static ZipArchiveStreamEntry* Create(ZipArchiveHandle handle, const ZipEntry& entry);
+  static ZipArchiveStreamEntry* CreateRaw(ZipArchiveHandle handle, const ZipEntry& entry);
+
+ protected:
+  ZipArchiveStreamEntry(ZipArchiveHandle handle) : handle_(handle) {}
+
+  virtual bool Init(const ZipEntry& entry);
+
+  ZipArchiveHandle handle_;
+
+  uint32_t crc32_;
+};
+
+#endif  // LIBZIPARCHIVE_ZIPARCHIVESTREAMENTRY_H_
diff --git a/init/log.cpp b/init/log.cpp
index a72906b..ace9fd7 100644
--- a/init/log.cpp
+++ b/init/log.cpp
@@ -27,6 +27,8 @@
 static void init_klog_vwrite(int level, const char* fmt, va_list ap) {
     static const char* tag = basename(getprogname());
 
+    if (level > klog_get_level()) return;
+
     // The kernel's printk buffer is only 1024 bytes.
     // TODO: should we automatically break up long lines into multiple lines?
     // Or we could log but with something like "..." at the end?
diff --git a/init/property_service.cpp b/init/property_service.cpp
index 806608e..5c1ae79 100644
--- a/init/property_service.cpp
+++ b/init/property_service.cpp
@@ -113,18 +113,6 @@
     return check_mac_perms(ctl_name, sctx, cr);
 }
 
-/*
- * Checks permissions for setting system properties.
- * Returns 1 if uid allowed, 0 otherwise.
- */
-static int check_perms(const char *name, char *sctx, struct ucred *cr)
-{
-    if(!strncmp(name, "ro.", 3))
-        name +=3;
-
-    return check_mac_perms(name, sctx, cr);
-}
-
 std::string property_get(const char* name) {
     char value[PROP_VALUE_MAX] = {0};
     __system_property_get(name, value);
@@ -312,7 +300,7 @@
                         msg.name + 4, msg.value, cr.uid, cr.gid, cr.pid);
             }
         } else {
-            if (check_perms(msg.name, source_ctx, &cr)) {
+            if (check_mac_perms(msg.name, source_ctx, &cr)) {
                 property_set((char*) msg.name, (char*) msg.value);
             } else {
                 ERROR("sys_prop: permission denied uid:%d  name:%s\n",
diff --git a/libbacktrace/backtrace_test.cpp b/libbacktrace/backtrace_test.cpp
index 23636db..7d829fe 100644
--- a/libbacktrace/backtrace_test.cpp
+++ b/libbacktrace/backtrace_test.cpp
@@ -1156,7 +1156,7 @@
   int fd = open(tmp_so_name, O_RDONLY);
   ASSERT_TRUE(fd != -1);
 
-  void* map = mmap(NULL, map_size, PROT_READ, MAP_PRIVATE, fd, 0);
+  void* map = mmap(NULL, map_size, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0);
   ASSERT_TRUE(map != MAP_FAILED);
   close(fd);
   ASSERT_TRUE(unlink(tmp_so_name) != -1);
@@ -1206,7 +1206,7 @@
       exit(0);
     }
 
-    void* map = mmap(NULL, map_size, PROT_READ, MAP_PRIVATE, fd, 0);
+    void* map = mmap(NULL, map_size, PROT_READ | PROT_EXEC, MAP_PRIVATE, fd, 0);
     if (map == MAP_FAILED) {
       fprintf(stderr, "Failed to map in memory: %s\n", strerror(errno));
       unlink(tmp_so_name);
diff --git a/libcutils/klog.c b/libcutils/klog.c
index 710dc66..7402903 100644
--- a/libcutils/klog.c
+++ b/libcutils/klog.c
@@ -62,6 +62,7 @@
 }
 
 void klog_write(int level, const char* fmt, ...) {
+    if (level > klog_level) return;
     char buf[LOG_BUF_MAX];
     va_list ap;
     va_start(ap, fmt);
diff --git a/libnativeloader/native_loader.cpp b/libnativeloader/native_loader.cpp
index 3153319..6e6b0b9 100644
--- a/libnativeloader/native_loader.cpp
+++ b/libnativeloader/native_loader.cpp
@@ -48,6 +48,7 @@
                                             "libm.so:"
                                             "libOpenMAXAL.so:"
                                             "libOpenSLES.so:"
+                                            "libRS.so:"
                                             "libstdc++.so:"
                                             "libwebviewchromium_plat_support.so:"
                                             "libz.so";
diff --git a/libziparchive/Android.mk b/libziparchive/Android.mk
index 8a4921f..056b3e1 100644
--- a/libziparchive/Android.mk
+++ b/libziparchive/Android.mk
@@ -15,34 +15,46 @@
 
 LOCAL_PATH := $(call my-dir)
 
-source_files := zip_archive.cc zip_writer.cc
-test_files := zip_archive_test.cc zip_writer_test.cc entry_name_utils_test.cc
+libziparchive_source_files := \
+    zip_archive.cc \
+    zip_archive_stream_entry.cc \
+    zip_writer.cc \
+
+libziparchive_test_files := \
+    entry_name_utils_test.cc \
+    zip_archive_test.cc \
+    zip_writer_test.cc \
 
 # ZLIB_CONST turns on const for input buffers, which is pretty standard.
-common_c_flags := -Werror -Wall -DZLIB_CONST
+libziparchive_common_c_flags := \
+    -DZLIB_CONST \
+    -Werror \
+    -Wall \
 
 # Incorrectly warns when C++11 empty brace {} initializer is used.
 # https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61489
-common_cpp_flags := -Wold-style-cast -Wno-missing-field-initializers
+libziparchive_common_cpp_flags := \
+    -Wold-style-cast \
+    -Wno-missing-field-initializers \
 
 include $(CLEAR_VARS)
 LOCAL_CPP_EXTENSION := .cc
-LOCAL_SRC_FILES := ${source_files}
+LOCAL_SRC_FILES := $(libziparchive_source_files)
 LOCAL_STATIC_LIBRARIES := libz
 LOCAL_SHARED_LIBRARIES := libutils libbase
 LOCAL_MODULE:= libziparchive
-LOCAL_CFLAGS := $(common_c_flags)
-LOCAL_CPPFLAGS := $(common_cpp_flags)
+LOCAL_CFLAGS := $(libziparchive_common_c_flags)
+LOCAL_CPPFLAGS := $(libziparchive_common_cpp_flags)
 include $(BUILD_STATIC_LIBRARY)
 
 include $(CLEAR_VARS)
 LOCAL_CPP_EXTENSION := .cc
-LOCAL_SRC_FILES := ${source_files}
+LOCAL_SRC_FILES := $(libziparchive_source_files)
 LOCAL_STATIC_LIBRARIES := libz libutils libbase
 LOCAL_MODULE:= libziparchive-host
-LOCAL_CFLAGS := $(common_c_flags)
+LOCAL_CFLAGS := $(libziparchive_common_c_flags)
 LOCAL_CFLAGS_windows := -mno-ms-bitfields
-LOCAL_CPPFLAGS := $(common_cpp_flags)
+LOCAL_CPPFLAGS := $(libziparchive_common_cpp_flags)
 
 LOCAL_MULTILIB := both
 LOCAL_MODULE_HOST_OS := darwin linux windows
@@ -50,12 +62,12 @@
 
 include $(CLEAR_VARS)
 LOCAL_CPP_EXTENSION := .cc
-LOCAL_SRC_FILES := ${source_files}
+LOCAL_SRC_FILES := $(libziparchive_source_files)
 LOCAL_STATIC_LIBRARIES := libutils
 LOCAL_SHARED_LIBRARIES := libz-host liblog libbase
 LOCAL_MODULE:= libziparchive-host
-LOCAL_CFLAGS := $(common_c_flags)
-LOCAL_CPPFLAGS := $(common_cpp_flags)
+LOCAL_CFLAGS := $(libziparchive_common_c_flags)
+LOCAL_CPPFLAGS := $(libziparchive_common_cpp_flags)
 LOCAL_MULTILIB := both
 include $(BUILD_HOST_SHARED_LIBRARY)
 
@@ -63,21 +75,33 @@
 include $(CLEAR_VARS)
 LOCAL_MODULE := ziparchive-tests
 LOCAL_CPP_EXTENSION := .cc
-LOCAL_CFLAGS := $(common_c_flags)
-LOCAL_CPPFLAGS := $(common_cpp_flags)
-LOCAL_SRC_FILES := $(test_files)
-LOCAL_SHARED_LIBRARIES := liblog libbase
-LOCAL_STATIC_LIBRARIES := libziparchive libz libutils
+LOCAL_CFLAGS := $(libziparchive_common_c_flags)
+LOCAL_CPPFLAGS := $(libziparchive_common_cpp_flags)
+LOCAL_SRC_FILES := $(libziparchive_test_files)
+LOCAL_SHARED_LIBRARIES := \
+    libbase \
+    liblog \
+
+LOCAL_STATIC_LIBRARIES := \
+    libziparchive \
+    libz \
+    libutils \
+
 include $(BUILD_NATIVE_TEST)
 
 include $(CLEAR_VARS)
 LOCAL_MODULE := ziparchive-tests-host
 LOCAL_CPP_EXTENSION := .cc
-LOCAL_CFLAGS := $(common_c_flags)
-LOCAL_CPPFLAGS := -Wno-unnamed-type-template-args $(common_cpp_flags)
-LOCAL_SRC_FILES := $(test_files)
-LOCAL_SHARED_LIBRARIES := libziparchive-host liblog libbase
+LOCAL_CFLAGS := $(libziparchive_common_c_flags)
+LOCAL_CPPFLAGS := -Wno-unnamed-type-template-args $(libziparchive_common_cpp_flags)
+LOCAL_SRC_FILES := $(libziparchive_test_files)
+LOCAL_SHARED_LIBRARIES := \
+    libziparchive-host \
+    liblog \
+    libbase \
+
 LOCAL_STATIC_LIBRARIES := \
+    libutils \
     libz \
-    libutils
+
 include $(BUILD_HOST_NATIVE_TEST)
diff --git a/libziparchive/testdata/bad_crc.zip b/libziparchive/testdata/bad_crc.zip
new file mode 100644
index 0000000..e12ba07
--- /dev/null
+++ b/libziparchive/testdata/bad_crc.zip
Binary files differ
diff --git a/libziparchive/testdata/large.zip b/libziparchive/testdata/large.zip
new file mode 100644
index 0000000..49659c8
--- /dev/null
+++ b/libziparchive/testdata/large.zip
Binary files differ
diff --git a/libziparchive/zip_archive.cc b/libziparchive/zip_archive.cc
index 07ef6cd..3b1e972 100644
--- a/libziparchive/zip_archive.cc
+++ b/libziparchive/zip_archive.cc
@@ -36,11 +36,12 @@
 #include "log/log.h"
 #include "utils/Compat.h"
 #include "utils/FileMap.h"
+#include "ziparchive/zip_archive.h"
 #include "zlib.h"
 
 #include "entry_name_utils-inl.h"
 #include "zip_archive_common.h"
-#include "ziparchive/zip_archive.h"
+#include "zip_archive_private.h"
 
 using android::base::get_unaligned;
 
@@ -134,43 +135,6 @@
  * every page that the Central Directory touches.  Easier to tuck a copy
  * of the string length into the hash table entry.
  */
-struct ZipArchive {
-  /* open Zip archive */
-  const int fd;
-  const bool close_file;
-
-  /* mapped central directory area */
-  off64_t directory_offset;
-  android::FileMap directory_map;
-
-  /* number of entries in the Zip archive */
-  uint16_t num_entries;
-
-  /*
-   * We know how many entries are in the Zip archive, so we can have a
-   * fixed-size hash table. We define a load factor of 0.75 and overallocat
-   * so the maximum number entries can never be higher than
-   * ((4 * UINT16_MAX) / 3 + 1) which can safely fit into a uint32_t.
-   */
-  uint32_t hash_table_size;
-  ZipString* hash_table;
-
-  ZipArchive(const int fd, bool assume_ownership) :
-      fd(fd),
-      close_file(assume_ownership),
-      directory_offset(0),
-      num_entries(0),
-      hash_table_size(0),
-      hash_table(NULL) {}
-
-  ~ZipArchive() {
-    if (close_file && fd >= 0) {
-      close(fd);
-    }
-
-    free(hash_table);
-  }
-};
 
 /*
  * Round up to the next highest power of 2.
diff --git a/libziparchive/zip_archive_private.h b/libziparchive/zip_archive_private.h
new file mode 100644
index 0000000..ab52368
--- /dev/null
+++ b/libziparchive/zip_archive_private.h
@@ -0,0 +1,63 @@
+/*
+ * Copyright (C) 2008 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 LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
+#define LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
+
+#include <stdint.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+#include <utils/FileMap.h>
+#include <ziparchive/zip_archive.h>
+
+struct ZipArchive {
+  // open Zip archive
+  const int fd;
+  const bool close_file;
+
+  // mapped central directory area
+  off64_t directory_offset;
+  android::FileMap directory_map;
+
+  // number of entries in the Zip archive
+  uint16_t num_entries;
+
+  // We know how many entries are in the Zip archive, so we can have a
+  // fixed-size hash table. We define a load factor of 0.75 and over
+  // allocate so the maximum number entries can never be higher than
+  // ((4 * UINT16_MAX) / 3 + 1) which can safely fit into a uint32_t.
+  uint32_t hash_table_size;
+  ZipString* hash_table;
+
+  ZipArchive(const int fd, bool assume_ownership) :
+      fd(fd),
+      close_file(assume_ownership),
+      directory_offset(0),
+      num_entries(0),
+      hash_table_size(0),
+      hash_table(NULL) {}
+
+  ~ZipArchive() {
+    if (close_file && fd >= 0) {
+      close(fd);
+    }
+
+    free(hash_table);
+  }
+};
+
+#endif  // LIBZIPARCHIVE_ZIPARCHIVE_PRIVATE_H_
diff --git a/libziparchive/zip_archive_stream_entry.cc b/libziparchive/zip_archive_stream_entry.cc
new file mode 100644
index 0000000..f618835
--- /dev/null
+++ b/libziparchive/zip_archive_stream_entry.cc
@@ -0,0 +1,305 @@
+/*
+ * 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.
+ */
+
+// Read-only stream access to Zip Archive entries.
+#include <errno.h>
+#include <inttypes.h>
+#include <string.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include <memory>
+#include <vector>
+
+#define LOG_TAG "ZIPARCHIVE"
+#include <android-base/file.h>
+#include <log/log.h>
+#include <ziparchive/zip_archive.h>
+#include <ziparchive/zip_archive_stream_entry.h>
+#include <zlib.h>
+
+#include "zip_archive_private.h"
+
+static constexpr size_t kBufSize = 65535;
+
+bool ZipArchiveStreamEntry::Init(const ZipEntry& entry) {
+  ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle_);
+  off64_t data_offset = entry.offset;
+  if (lseek64(archive->fd, data_offset, SEEK_SET) != data_offset) {
+    ALOGW("lseek to data at %" PRId64 " failed: %s", data_offset, strerror(errno));
+    return false;
+  }
+  crc32_ = entry.crc32;
+  return true;
+}
+
+class ZipArchiveStreamEntryUncompressed : public ZipArchiveStreamEntry {
+ public:
+  ZipArchiveStreamEntryUncompressed(ZipArchiveHandle handle) : ZipArchiveStreamEntry(handle) {}
+  virtual ~ZipArchiveStreamEntryUncompressed() {}
+
+  const std::vector<uint8_t>* Read() override;
+
+  bool Verify() override;
+
+ protected:
+  bool Init(const ZipEntry& entry) override;
+
+  uint32_t length_;
+
+ private:
+  std::vector<uint8_t> data_;
+  uint32_t computed_crc32_;
+};
+
+bool ZipArchiveStreamEntryUncompressed::Init(const ZipEntry& entry) {
+  if (!ZipArchiveStreamEntry::Init(entry)) {
+    return false;
+  }
+
+  length_ = entry.uncompressed_length;
+
+  data_.resize(kBufSize);
+  computed_crc32_ = 0;
+
+  return true;
+}
+
+const std::vector<uint8_t>* ZipArchiveStreamEntryUncompressed::Read() {
+  if (length_ == 0) {
+    return nullptr;
+  }
+
+  size_t bytes = (length_ > data_.size()) ? data_.size() : length_;
+  ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle_);
+  errno = 0;
+  if (!android::base::ReadFully(archive->fd, data_.data(), bytes)) {
+    if (errno != 0) {
+      ALOGE("Error reading from archive fd: %s", strerror(errno));
+    } else {
+      ALOGE("Short read of zip file, possibly corrupted zip?");
+    }
+    length_ = 0;
+    return nullptr;
+  }
+
+  if (bytes < data_.size()) {
+    data_.resize(bytes);
+  }
+  computed_crc32_ = crc32(computed_crc32_, data_.data(), data_.size());
+  length_ -= bytes;
+  return &data_;
+}
+
+bool ZipArchiveStreamEntryUncompressed::Verify() {
+  return length_ == 0 && crc32_ == computed_crc32_;
+}
+
+class ZipArchiveStreamEntryCompressed : public ZipArchiveStreamEntry {
+ public:
+  ZipArchiveStreamEntryCompressed(ZipArchiveHandle handle) : ZipArchiveStreamEntry(handle) {}
+  virtual ~ZipArchiveStreamEntryCompressed();
+
+  const std::vector<uint8_t>* Read() override;
+
+  bool Verify() override;
+
+ protected:
+  bool Init(const ZipEntry& entry) override;
+
+ private:
+  bool z_stream_init_ = false;
+  z_stream z_stream_;
+  std::vector<uint8_t> in_;
+  std::vector<uint8_t> out_;
+  uint32_t uncompressed_length_;
+  uint32_t compressed_length_;
+  uint32_t computed_crc32_;
+};
+
+// This method is using libz macros with old-style-casts
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wold-style-cast"
+static inline int zlib_inflateInit2(z_stream* stream, int window_bits) {
+  return inflateInit2(stream, window_bits);
+}
+#pragma GCC diagnostic pop
+
+bool ZipArchiveStreamEntryCompressed::Init(const ZipEntry& entry) {
+  if (!ZipArchiveStreamEntry::Init(entry)) {
+    return false;
+  }
+
+  // Initialize the zlib stream struct.
+  memset(&z_stream_, 0, sizeof(z_stream_));
+  z_stream_.zalloc = Z_NULL;
+  z_stream_.zfree = Z_NULL;
+  z_stream_.opaque = Z_NULL;
+  z_stream_.next_in = nullptr;
+  z_stream_.avail_in = 0;
+  z_stream_.avail_out = 0;
+  z_stream_.data_type = Z_UNKNOWN;
+
+  // Use the undocumented "negative window bits" feature to tell zlib
+  // that there's no zlib header waiting for it.
+  int zerr = zlib_inflateInit2(&z_stream_, -MAX_WBITS);
+  if (zerr != Z_OK) {
+    if (zerr == Z_VERSION_ERROR) {
+      ALOGE("Installed zlib is not compatible with linked version (%s)",
+        ZLIB_VERSION);
+    } else {
+      ALOGE("Call to inflateInit2 failed (zerr=%d)", zerr);
+    }
+
+    return false;
+  }
+
+  z_stream_init_ = true;
+
+  uncompressed_length_ = entry.uncompressed_length;
+  compressed_length_ = entry.compressed_length;
+
+  out_.resize(kBufSize);
+  in_.resize(kBufSize);
+
+  computed_crc32_ = 0;
+
+  return true;
+}
+
+ZipArchiveStreamEntryCompressed::~ZipArchiveStreamEntryCompressed() {
+  if (z_stream_init_) {
+    inflateEnd(&z_stream_);
+    z_stream_init_ = false;
+  }
+}
+
+bool ZipArchiveStreamEntryCompressed::Verify() {
+  return z_stream_init_ && uncompressed_length_ == 0 && compressed_length_ == 0 &&
+      crc32_ == computed_crc32_;
+}
+
+const std::vector<uint8_t>* ZipArchiveStreamEntryCompressed::Read() {
+  if (z_stream_.avail_out == 0) {
+    z_stream_.next_out = out_.data();
+    z_stream_.avail_out = out_.size();;
+  }
+
+  while (true) {
+    if (z_stream_.avail_in == 0) {
+      if (compressed_length_ == 0) {
+        return nullptr;
+      }
+      size_t bytes = (compressed_length_ > in_.size()) ? in_.size() : compressed_length_;
+      ZipArchive* archive = reinterpret_cast<ZipArchive*>(handle_);
+      errno = 0;
+      if (!android::base::ReadFully(archive->fd, in_.data(), bytes)) {
+        if (errno != 0) {
+          ALOGE("Error reading from archive fd: %s", strerror(errno));
+        } else {
+          ALOGE("Short read of zip file, possibly corrupted zip?");
+        }
+        return nullptr;
+      }
+
+      compressed_length_ -= bytes;
+      z_stream_.next_in = in_.data();
+      z_stream_.avail_in = bytes;
+    }
+
+    int zerr = inflate(&z_stream_, Z_NO_FLUSH);
+    if (zerr != Z_OK && zerr != Z_STREAM_END) {
+      ALOGE("inflate zerr=%d (nIn=%p aIn=%u nOut=%p aOut=%u)",
+          zerr, z_stream_.next_in, z_stream_.avail_in,
+          z_stream_.next_out, z_stream_.avail_out);
+      return nullptr;
+    }
+
+    if (z_stream_.avail_out == 0) {
+      uncompressed_length_ -= out_.size();
+      computed_crc32_ = crc32(computed_crc32_, out_.data(), out_.size());
+      return &out_;
+    }
+    if (zerr == Z_STREAM_END) {
+      if (z_stream_.avail_out != 0) {
+        // Resize the vector down to the actual size of the data.
+        out_.resize(out_.size() - z_stream_.avail_out);
+        computed_crc32_ = crc32(computed_crc32_, out_.data(), out_.size());
+        uncompressed_length_ -= out_.size();
+        return &out_;
+      }
+      return nullptr;
+    }
+  }
+  return nullptr;
+}
+
+class ZipArchiveStreamEntryRawCompressed : public ZipArchiveStreamEntryUncompressed {
+ public:
+  ZipArchiveStreamEntryRawCompressed(ZipArchiveHandle handle)
+      : ZipArchiveStreamEntryUncompressed(handle) {}
+  virtual ~ZipArchiveStreamEntryRawCompressed() {}
+
+  bool Verify() override;
+
+ protected:
+  bool Init(const ZipEntry& entry) override;
+};
+
+bool ZipArchiveStreamEntryRawCompressed::Init(const ZipEntry& entry) {
+  if (!ZipArchiveStreamEntryUncompressed::Init(entry)) {
+    return false;
+  }
+  length_ = entry.compressed_length;
+
+  return true;
+}
+
+bool ZipArchiveStreamEntryRawCompressed::Verify() {
+  return length_ == 0;
+}
+
+ZipArchiveStreamEntry* ZipArchiveStreamEntry::Create(
+    ZipArchiveHandle handle, const ZipEntry& entry) {
+  ZipArchiveStreamEntry* stream = nullptr;
+  if (entry.method != kCompressStored) {
+    stream = new ZipArchiveStreamEntryCompressed(handle);
+  } else {
+    stream = new ZipArchiveStreamEntryUncompressed(handle);
+  }
+  if (stream && !stream->Init(entry)) {
+    delete stream;
+    stream = nullptr;
+  }
+
+  return stream;
+}
+
+ZipArchiveStreamEntry* ZipArchiveStreamEntry::CreateRaw(
+    ZipArchiveHandle handle, const ZipEntry& entry) {
+  ZipArchiveStreamEntry* stream = nullptr;
+  if (entry.method == kCompressStored) {
+    // Not compressed, don't need to do anything special.
+    stream = new ZipArchiveStreamEntryUncompressed(handle);
+  } else {
+    stream = new ZipArchiveStreamEntryRawCompressed(handle);
+  }
+  if (stream && !stream->Init(entry)) {
+    delete stream;
+    stream = nullptr;
+  }
+  return stream;
+}
diff --git a/libziparchive/zip_archive_test.cc b/libziparchive/zip_archive_test.cc
index cb0f410..d426dc4 100644
--- a/libziparchive/zip_archive_test.cc
+++ b/libziparchive/zip_archive_test.cc
@@ -14,54 +14,49 @@
  * limitations under the License.
  */
 
-#include "ziparchive/zip_archive.h"
-
 #include <errno.h>
 #include <fcntl.h>
 #include <getopt.h>
 #include <stdio.h>
+#include <string.h>
 #include <unistd.h>
+
 #include <vector>
 
 #include <android-base/file.h>
 #include <gtest/gtest.h>
+#include <ziparchive/zip_archive.h>
+#include <ziparchive/zip_archive_stream_entry.h>
 
 static std::string test_data_dir;
 
 static const std::string kMissingZip = "missing.zip";
 static const std::string kValidZip = "valid.zip";
+static const std::string kLargeZip = "large.zip";
+static const std::string kBadCrcZip = "bad_crc.zip";
 
-static const uint8_t kATxtContents[] = {
+static const std::vector<uint8_t> kATxtContents {
   'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
   'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
   '\n'
 };
 
-static const uint8_t kBTxtContents[] = {
+static const std::vector<uint8_t> kATxtContentsCompressed {
+  'K', 'L', 'J', 'N', 'I', 'M', 'K', 207, 'H',
+  132, 210, '\\', '\0'
+};
+
+static const std::vector<uint8_t> kBTxtContents {
   'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
   '\n'
 };
 
-static const uint16_t kATxtNameLength = 5;
-static const uint16_t kBTxtNameLength = 5;
-static const uint16_t kNonexistentTxtNameLength = 15;
-static const uint16_t kEmptyTxtNameLength = 9;
-
-static const uint8_t kATxtName[kATxtNameLength] = {
-  'a', '.', 't', 'x', 't'
-};
-
-static const uint8_t kBTxtName[kBTxtNameLength] = {
-  'b', '.', 't', 'x', 't'
-};
-
-static const uint8_t kNonexistentTxtName[kNonexistentTxtNameLength] = {
-  'n', 'o', 'n', 'e', 'x', 'i', 's', 't', 'e', 'n', 't', '.', 't', 'x' ,'t'
-};
-
-static const uint8_t kEmptyTxtName[kEmptyTxtNameLength] = {
-  'e', 'm', 'p', 't', 'y', '.', 't', 'x', 't'
-};
+static const std::string kATxtName("a.txt");
+static const std::string kBTxtName("b.txt");
+static const std::string kNonexistentTxtName("nonexistent.txt");
+static const std::string kEmptyTxtName("empty.txt");
+static const std::string kLargeCompressTxtName("compress.txt");
+static const std::string kLargeUncompressTxtName("uncompress.txt");
 
 static int32_t OpenArchiveWrapper(const std::string& name,
                                   ZipArchiveHandle* handle) {
@@ -75,6 +70,11 @@
   ASSERT_EQ(0, memcmp(name_str.c_str(), name.name, name.name_length));
 }
 
+static void SetZipString(ZipString* zip_str, const std::string& str) {
+  zip_str->name = reinterpret_cast<const uint8_t*>(str.c_str());
+  zip_str->name_length = str.size();
+}
+
 TEST(ziparchive, Open) {
   ZipArchiveHandle handle;
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
@@ -115,7 +115,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper(kValidZip, &handle));
 
   void* iteration_cookie;
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, NULL, NULL));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, nullptr, nullptr));
 
   ZipEntry data;
   ZipString name;
@@ -152,7 +152,7 @@
 
   void* iteration_cookie;
   ZipString prefix("b/");
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, &prefix, NULL));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, &prefix, nullptr));
 
   ZipEntry data;
   ZipString name;
@@ -181,7 +181,7 @@
 
   void* iteration_cookie;
   ZipString suffix(".txt");
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, NULL, &suffix));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, nullptr, &suffix));
 
   ZipEntry data;
   ZipString name;
@@ -262,8 +262,7 @@
 
   ZipEntry data;
   ZipString name;
-  name.name = kATxtName;
-  name.name_length = kATxtNameLength;
+  SetZipString(&name, kATxtName);
   ASSERT_EQ(0, FindEntry(handle, name, &data));
 
   // Known facts about a.txt, from zipinfo -v.
@@ -276,8 +275,7 @@
 
   // An entry that doesn't exist. Should be a negative return code.
   ZipString absent_name;
-  absent_name.name = kNonexistentTxtName;
-  absent_name.name_length = kNonexistentTxtNameLength;
+  SetZipString(&absent_name, kNonexistentTxtName);
   ASSERT_LT(FindEntry(handle, absent_name, &data), 0);
 
   CloseArchive(handle);
@@ -288,7 +286,7 @@
   ASSERT_EQ(0, OpenArchiveWrapper("declaredlength.zip", &handle));
 
   void* iteration_cookie;
-  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, NULL, NULL));
+  ASSERT_EQ(0, StartIteration(handle, &iteration_cookie, nullptr, nullptr));
 
   ZipString name;
   ZipEntry data;
@@ -306,26 +304,24 @@
   // An entry that's deflated.
   ZipEntry data;
   ZipString a_name;
-  a_name.name = kATxtName;
-  a_name.name_length = kATxtNameLength;
+  SetZipString(&a_name, kATxtName);
   ASSERT_EQ(0, FindEntry(handle, a_name, &data));
   const uint32_t a_size = data.uncompressed_length;
-  ASSERT_EQ(a_size, sizeof(kATxtContents));
+  ASSERT_EQ(a_size, kATxtContents.size());
   uint8_t* buffer = new uint8_t[a_size];
   ASSERT_EQ(0, ExtractToMemory(handle, &data, buffer, a_size));
-  ASSERT_EQ(0, memcmp(buffer, kATxtContents, a_size));
+  ASSERT_EQ(0, memcmp(buffer, kATxtContents.data(), a_size));
   delete[] buffer;
 
   // An entry that's stored.
   ZipString b_name;
-  b_name.name = kBTxtName;
-  b_name.name_length = kBTxtNameLength;
+  SetZipString(&b_name, kBTxtName);
   ASSERT_EQ(0, FindEntry(handle, b_name, &data));
   const uint32_t b_size = data.uncompressed_length;
-  ASSERT_EQ(b_size, sizeof(kBTxtContents));
+  ASSERT_EQ(b_size, kBTxtContents.size());
   buffer = new uint8_t[b_size];
   ASSERT_EQ(0, ExtractToMemory(handle, &data, buffer, b_size));
-  ASSERT_EQ(0, memcmp(buffer, kBTxtContents, b_size));
+  ASSERT_EQ(0, memcmp(buffer, kBTxtContents.data(), b_size));
   delete[] buffer;
 
   CloseArchive(handle);
@@ -374,8 +370,7 @@
   0x0100, 0x4c00, 0x0000, 0x5b00, 0x0001, 0x0000, 0x0000
 };
 
-static const uint8_t kAbTxtName[] = { 'a', 'b', '.', 't', 'x', 't' };
-static const uint16_t kAbTxtNameLength = sizeof(kAbTxtName);
+static const std::string kAbTxtName("ab.txt");
 static const size_t kAbUncompressedSize = 270216;
 
 static int make_temporary_file(const char* file_name_pattern) {
@@ -405,8 +400,7 @@
 
   ZipEntry entry;
   ZipString empty_name;
-  empty_name.name = kEmptyTxtName;
-  empty_name.name_length = kEmptyTxtNameLength;
+  SetZipString(&empty_name, kEmptyTxtName);
   ASSERT_EQ(0, FindEntry(handle, empty_name, &entry));
   ASSERT_EQ(static_cast<uint32_t>(0), entry.uncompressed_length);
   uint8_t buffer[1];
@@ -436,8 +430,7 @@
 
   ZipEntry entry;
   ZipString ab_name;
-  ab_name.name = kAbTxtName;
-  ab_name.name_length = kAbTxtNameLength;
+  SetZipString(&ab_name, kAbTxtName);
   ASSERT_EQ(0, FindEntry(handle, ab_name, &entry));
   ASSERT_EQ(kAbUncompressedSize, entry.uncompressed_length);
 
@@ -504,8 +497,7 @@
 
   ZipEntry entry;
   ZipString name;
-  name.name = kATxtName;
-  name.name_length = kATxtNameLength;
+  SetZipString(&name, kATxtName);
   ASSERT_EQ(0, FindEntry(handle, name, &entry));
   ASSERT_EQ(0, ExtractEntryToFile(handle, &entry, fd));
 
@@ -521,22 +513,131 @@
   ASSERT_EQ(static_cast<ssize_t>(entry.uncompressed_length),
             TEMP_FAILURE_RETRY(
                 read(fd, &uncompressed_data[0], entry.uncompressed_length)));
-  ASSERT_EQ(0, memcmp(&uncompressed_data[0], kATxtContents,
-                      sizeof(kATxtContents)));
+  ASSERT_EQ(0, memcmp(&uncompressed_data[0], kATxtContents.data(),
+                      kATxtContents.size()));
 
   // Assert that the total length of the file is sane
-  ASSERT_EQ(data_size + static_cast<ssize_t>(sizeof(kATxtContents)),
+  ASSERT_EQ(data_size + static_cast<ssize_t>(kATxtContents.size()),
             lseek64(fd, 0, SEEK_END));
 
   close(fd);
 }
 
+static void ZipArchiveStreamTest(
+    ZipArchiveHandle& handle, const std::string& entry_name, bool raw,
+    bool verified, ZipEntry* entry, std::vector<uint8_t>* read_data) {
+  ZipString name;
+  SetZipString(&name, entry_name);
+  ASSERT_EQ(0, FindEntry(handle, name, entry));
+  std::unique_ptr<ZipArchiveStreamEntry> stream;
+  if (raw) {
+    stream.reset(ZipArchiveStreamEntry::CreateRaw(handle, *entry));
+    if (entry->method == kCompressStored) {
+      read_data->resize(entry->uncompressed_length);
+    } else {
+      read_data->resize(entry->compressed_length);
+    }
+  } else {
+    stream.reset(ZipArchiveStreamEntry::Create(handle, *entry));
+    read_data->resize(entry->uncompressed_length);
+  }
+  uint8_t* read_data_ptr = read_data->data();
+  ASSERT_TRUE(stream.get() != nullptr);
+  const std::vector<uint8_t>* data;
+  uint64_t total_size = 0;
+  while ((data = stream->Read()) != nullptr) {
+    total_size += data->size();
+    memcpy(read_data_ptr, data->data(), data->size());
+    read_data_ptr += data->size();
+  }
+  ASSERT_EQ(verified, stream->Verify());
+  ASSERT_EQ(total_size, read_data->size());
+}
+
+static void ZipArchiveStreamTestUsingContents(
+    const std::string& zip_file, const std::string& entry_name,
+    const std::vector<uint8_t>& contents, bool raw) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(zip_file, &handle));
+
+  ZipEntry entry;
+  std::vector<uint8_t> read_data;
+  ZipArchiveStreamTest(handle, entry_name, raw, true, &entry, &read_data);
+
+  ASSERT_EQ(contents.size(), read_data.size());
+  ASSERT_TRUE(memcmp(read_data.data(), contents.data(), read_data.size()) == 0);
+
+  CloseArchive(handle);
+}
+
+static void ZipArchiveStreamTestUsingMemory(const std::string& zip_file, const std::string& entry_name) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(zip_file, &handle));
+
+  ZipEntry entry;
+  std::vector<uint8_t> read_data;
+  ZipArchiveStreamTest(handle, entry_name, false, true, &entry, &read_data);
+
+  std::vector<uint8_t> cmp_data(entry.uncompressed_length);
+  ASSERT_EQ(entry.uncompressed_length, read_data.size());
+  ASSERT_EQ(0, ExtractToMemory(handle, &entry, cmp_data.data(), cmp_data.size()));
+  ASSERT_TRUE(memcmp(read_data.data(), cmp_data.data(), read_data.size()) == 0);
+
+  CloseArchive(handle);
+}
+
+TEST(ziparchive, StreamCompressed) {
+  ZipArchiveStreamTestUsingContents(kValidZip, kATxtName, kATxtContents, false);
+}
+
+TEST(ziparchive, StreamUncompressed) {
+  ZipArchiveStreamTestUsingContents(kValidZip, kBTxtName, kBTxtContents, false);
+}
+
+TEST(ziparchive, StreamRawCompressed) {
+  ZipArchiveStreamTestUsingContents(kValidZip, kATxtName, kATxtContentsCompressed, true);
+}
+
+TEST(ziparchive, StreamRawUncompressed) {
+  ZipArchiveStreamTestUsingContents(kValidZip, kBTxtName, kBTxtContents, true);
+}
+
+TEST(ziparchive, StreamLargeCompressed) {
+  ZipArchiveStreamTestUsingMemory(kLargeZip, kLargeCompressTxtName);
+}
+
+TEST(ziparchive, StreamLargeUncompressed) {
+  ZipArchiveStreamTestUsingMemory(kLargeZip, kLargeUncompressTxtName);
+}
+
+TEST(ziparchive, StreamCompressedBadCrc) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(kBadCrcZip, &handle));
+
+  ZipEntry entry;
+  std::vector<uint8_t> read_data;
+  ZipArchiveStreamTest(handle, kATxtName, false, false, &entry, &read_data);
+
+  CloseArchive(handle);
+}
+
+TEST(ziparchive, StreamUncompressedBadCrc) {
+  ZipArchiveHandle handle;
+  ASSERT_EQ(0, OpenArchiveWrapper(kBadCrcZip, &handle));
+
+  ZipEntry entry;
+  std::vector<uint8_t> read_data;
+  ZipArchiveStreamTest(handle, kBTxtName, false, false, &entry, &read_data);
+
+  CloseArchive(handle);
+}
+
 int main(int argc, char** argv) {
   ::testing::InitGoogleTest(&argc, argv);
 
   static struct option options[] = {
-    { "test_data_dir", required_argument, NULL, 't' },
-    { NULL, 0, NULL, 0 }
+    { "test_data_dir", required_argument, nullptr, 't' },
+    { nullptr, 0, nullptr, 0 }
   };
 
   while (true) {
@@ -557,9 +658,15 @@
   }
 
   if (test_data_dir[0] != '/') {
-    printf("Test data must be an absolute path, was %s\n\n",
-           test_data_dir.c_str());
-    return -2;
+    std::vector<char> cwd_buffer(1024);
+    const char* cwd = getcwd(cwd_buffer.data(), cwd_buffer.size() - 1);
+    if (cwd == nullptr) {
+      printf("Cannot get current working directory, use an absolute path instead, was %s\n\n",
+             test_data_dir.c_str());
+      return -2;
+    }
+    test_data_dir = '/' + test_data_dir;
+    test_data_dir = cwd + test_data_dir;
   }
 
   return RUN_ALL_TESTS();
diff --git a/logd/FlushCommand.cpp b/logd/FlushCommand.cpp
index cb3d1c2..48036d3 100644
--- a/logd/FlushCommand.cpp
+++ b/logd/FlushCommand.cpp
@@ -36,7 +36,7 @@
         mLogMask(logMask),
         mPid(pid),
         mStart(start),
-        mTimeout(timeout) {
+        mTimeout((start > 1) ? timeout : 0) {
 }
 
 // runSocketCommand is called once for every open client on the
diff --git a/logd/LogBuffer.cpp b/logd/LogBuffer.cpp
index 707527b..cdf5d08 100644
--- a/logd/LogBuffer.cpp
+++ b/logd/LogBuffer.cpp
@@ -109,6 +109,9 @@
     }
 
     log_id_for_each(i) {
+        mLastSet[i] = false;
+        mLast[i] = mLogElements.begin();
+
         char key[PROP_NAME_MAX];
 
         snprintf(key, sizeof(key), "%s.%s",
@@ -329,7 +332,15 @@
         }
     }
 
+    bool setLast = mLastSet[id] && (it == mLast[id]);
     it = mLogElements.erase(it);
+    if (setLast) {
+        if (it == mLogElements.end()) { // unlikely
+            mLastSet[id] = false;
+        } else {
+            mLast[id] = it;
+        }
+    }
     if (coalesce) {
         stats.erase(element);
     } else {
@@ -490,7 +501,8 @@
 
     if (caller_uid != AID_ROOT) {
         // Only here if clearAll condition (pruneRows == ULONG_MAX)
-        for(it = mLogElements.begin(); it != mLogElements.end();) {
+        it = mLastSet[id] ? mLast[id] : mLogElements.begin();
+        while (it != mLogElements.end()) {
             LogBufferElement *element = *it;
 
             if ((element->getLogId() != id) || (element->getUid() != caller_uid)) {
@@ -498,6 +510,11 @@
                 continue;
             }
 
+            if (!mLastSet[id] || ((*mLast[id])->getLogId() != id)) {
+                mLast[id] = it;
+                mLastSet[id] = true;
+            }
+
             if (oldest && (oldest->mStart <= element->getSequence())) {
                 busy = true;
                 if (oldest->mTimeout.tv_sec || oldest->mTimeout.tv_nsec) {
@@ -566,7 +583,7 @@
 
         bool kick = false;
         bool leading = true;
-        it = mLogElements.begin();
+        it = mLastSet[id] ? mLast[id] : mLogElements.begin();
         // Perform at least one mandatory garbage collection cycle in following
         // - clear leading chatty tags
         // - coalesce chatty tags
@@ -615,6 +632,11 @@
                 continue;
             }
 
+            if (leading && (!mLastSet[id] || ((*mLast[id])->getLogId() != id))) {
+                mLast[id] = it;
+                mLastSet[id] = true;
+            }
+
             unsigned short dropped = element->getDropped();
 
             // remove any leading drops
@@ -725,7 +747,7 @@
 
     bool whitelist = false;
     bool hasWhitelist = (id != LOG_ID_SECURITY) && mPrune.nice() && !clearAll;
-    it = mLogElements.begin();
+    it = mLastSet[id] ? mLast[id] : mLogElements.begin();
     while((pruneRows > 0) && (it != mLogElements.end())) {
         LogBufferElement *element = *it;
 
@@ -734,6 +756,11 @@
             continue;
         }
 
+        if (!mLastSet[id] || ((*mLast[id])->getLogId() != id)) {
+            mLast[id] = it;
+            mLastSet[id] = true;
+        }
+
         if (oldest && (oldest->mStart <= element->getSequence())) {
             busy = true;
             if (whitelist) {
@@ -764,7 +791,7 @@
 
     // Do not save the whitelist if we are reader range limited
     if (whitelist && (pruneRows > 0)) {
-        it = mLogElements.begin();
+        it = mLastSet[id] ? mLast[id] : mLogElements.begin();
         while((it != mLogElements.end()) && (pruneRows > 0)) {
             LogBufferElement *element = *it;
 
@@ -773,6 +800,11 @@
                 continue;
             }
 
+            if (!mLastSet[id] || ((*mLast[id])->getLogId() != id)) {
+                mLast[id] = it;
+                mLastSet[id] = true;
+            }
+
             if (oldest && (oldest->mStart <= element->getSequence())) {
                 busy = true;
                 if (stats.sizes(id) > (2 * log_buffer_size(id))) {
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index 2667e78..03739c7 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -82,6 +82,9 @@
     LogStatistics stats;
 
     PruneList mPrune;
+    // watermark for last per log id
+    LogBufferElementCollection::iterator mLast[LOG_ID_MAX];
+    bool mLastSet[LOG_ID_MAX];
     // watermark of any worst/chatty uid processing
     typedef std::unordered_map<uid_t,
                                LogBufferElementCollection::iterator>
diff --git a/logd/LogListener.cpp b/logd/LogListener.cpp
index 5348a2d..846dd7c 100644
--- a/logd/LogListener.cpp
+++ b/logd/LogListener.cpp
@@ -15,6 +15,7 @@
  */
 
 #include <limits.h>
+#include <sys/cdefs.h>
 #include <sys/prctl.h>
 #include <sys/socket.h>
 #include <sys/types.h>
@@ -46,7 +47,7 @@
         + LOGGER_ENTRY_MAX_PAYLOAD];
     struct iovec iov = { buffer, sizeof(buffer) };
 
-    char control[CMSG_SPACE(sizeof(struct ucred))];
+    char control[CMSG_SPACE(sizeof(struct ucred))] __aligned(4);
     struct msghdr hdr = {
         NULL,
         0,
diff --git a/toolbox/ps.c b/toolbox/ps.c
index 3bc540d..ecc1c9f 100644
--- a/toolbox/ps.c
+++ b/toolbox/ps.c
@@ -57,7 +57,7 @@
     int prio, nice, rtprio, sched, psr;
     struct passwd *pw;
 
-    sprintf(statline, "/proc/%d", pid);
+    sprintf(statline, "/proc/%d", tid ? tid : pid);
     stat(statline, &stats);
 
     if(tid) {