diff --git a/adb/Android.mk b/adb/Android.mk
index d629223..baa4985 100644
--- a/adb/Android.mk
+++ b/adb/Android.mk
@@ -58,6 +58,7 @@
 LIBADB_TEST_SRCS := \
     adb_io_test.cpp \
     adb_utils_test.cpp \
+    sysdeps_test.cpp \
     transport_test.cpp \
 
 LIBADB_CFLAGS := \
diff --git a/adb/sysdeps.h b/adb/sysdeps.h
index 16796cd..761a4c7 100644
--- a/adb/sysdeps.h
+++ b/adb/sysdeps.h
@@ -30,6 +30,7 @@
 #include <vector>
 
 // Include this before open/unlink are defined as macros below.
+#include <android-base/errors.h>
 #include <android-base/utf8.h>
 
 /*
@@ -114,13 +115,57 @@
     LeaveCriticalSection( lock );
 }
 
-typedef  void*  (*adb_thread_func_t)(void*  arg);
+typedef void* (*adb_thread_func_t)(void* arg);
+typedef HANDLE adb_thread_t;
 
-typedef  void (*win_thread_func_t)(void*  arg);
+struct win_thread_args {
+    adb_thread_func_t func;
+    void* arg;
+};
 
-static __inline__ bool adb_thread_create(adb_thread_func_t func, void* arg) {
-    uintptr_t tid = _beginthread((win_thread_func_t)func, 0, arg);
-    return (tid != static_cast<uintptr_t>(-1L));
+static unsigned __stdcall win_thread_wrapper(void* args) {
+    win_thread_args thread_args = *static_cast<win_thread_args*>(args);
+    delete static_cast<win_thread_args*>(args);
+    void* result = thread_args.func(thread_args.arg);
+    return reinterpret_cast<unsigned>(result);
+}
+
+static __inline__ bool adb_thread_create(adb_thread_func_t func, void* arg,
+                                         adb_thread_t* thread = nullptr) {
+    win_thread_args* args = new win_thread_args{.func = func, .arg = arg};
+    uintptr_t handle = _beginthreadex(nullptr, 0, win_thread_wrapper, args, 0, nullptr);
+    if (handle != static_cast<uintptr_t>(0)) {
+        if (thread) {
+            *thread = reinterpret_cast<HANDLE>(handle);
+        } else {
+            CloseHandle(thread);
+        }
+        return true;
+    }
+    return false;
+}
+
+static __inline__ bool adb_thread_join(adb_thread_t thread) {
+    switch (WaitForSingleObject(thread, INFINITE)) {
+        case WAIT_OBJECT_0:
+            CloseHandle(thread);
+            return true;
+
+        case WAIT_FAILED:
+            fprintf(stderr, "adb_thread_join failed: %s\n",
+                    android::base::SystemErrorCodeToString(GetLastError()).c_str());
+            break;
+
+        default:
+            abort();
+    }
+
+    return false;
+}
+
+static __inline__ bool adb_thread_detach(adb_thread_t thread) {
+    CloseHandle(thread);
+    return true;
 }
 
 static __inline__ int adb_thread_setname(const std::string& name) {
@@ -658,14 +703,32 @@
 
 typedef void*  (*adb_thread_func_t)( void*  arg );
 
-static __inline__ bool adb_thread_create(adb_thread_func_t start, void* arg) {
+typedef pthread_t adb_thread_t;
+
+static __inline__ bool adb_thread_create(adb_thread_func_t start, void* arg,
+                                         adb_thread_t* thread = nullptr) {
+    pthread_t temp;
     pthread_attr_t attr;
     pthread_attr_init(&attr);
-    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+    pthread_attr_setdetachstate(&attr, thread ? PTHREAD_CREATE_JOINABLE : PTHREAD_CREATE_DETACHED);
+    errno = pthread_create(&temp, &attr, start, arg);
+    if (errno == 0) {
+        if (thread) {
+            *thread = temp;
+        }
+        return true;
+    }
+    return false;
+}
 
-    pthread_t thread;
-    errno = pthread_create(&thread, &attr, start, arg);
-    return (errno == 0);
+static __inline__ bool adb_thread_join(adb_thread_t thread) {
+    errno = pthread_join(thread, nullptr);
+    return errno == 0;
+}
+
+static __inline__ bool adb_thread_detach(adb_thread_t thread) {
+    errno = pthread_detach(thread);
+    return errno == 0;
 }
 
 static __inline__ int adb_thread_setname(const std::string& name) {
diff --git a/adb/sysdeps_test.cpp b/adb/sysdeps_test.cpp
new file mode 100644
index 0000000..daceb89
--- /dev/null
+++ b/adb/sysdeps_test.cpp
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2016 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 <gtest/gtest.h>
+#include <unistd.h>
+#include <atomic>
+
+#include "sysdeps.h"
+
+static void* increment_atomic_int(void* c) {
+    sleep(1);
+    reinterpret_cast<std::atomic<int>*>(c)->fetch_add(1);
+    return nullptr;
+}
+
+TEST(sysdeps_thread, smoke) {
+    std::atomic<int> counter(0);
+
+    for (int i = 0; i < 100; ++i) {
+        ASSERT_TRUE(adb_thread_create(increment_atomic_int, &counter));
+    }
+
+    sleep(2);
+    ASSERT_EQ(100, counter.load());
+}
+
+TEST(sysdeps_thread, join) {
+    std::atomic<int> counter(0);
+    std::vector<adb_thread_t> threads(500);
+    for (size_t i = 0; i < threads.size(); ++i) {
+        ASSERT_TRUE(adb_thread_create(increment_atomic_int, &counter, &threads[i]));
+    }
+
+    int current = counter.load();
+    ASSERT_GE(current, 0);
+    // Make sure that adb_thread_create actually creates threads, and doesn't do something silly
+    // like synchronously run the function passed in. The sleep in increment_atomic_int should be
+    // enough to keep this from being flakey.
+    ASSERT_LT(current, 500);
+
+    for (const auto& thread : threads) {
+        ASSERT_TRUE(adb_thread_join(thread));
+    }
+
+    ASSERT_EQ(500, counter.load());
+}
diff --git a/libbacktrace/Android.mk b/libbacktrace/Android.mk
index ee56a5e..397dfda 100644
--- a/libbacktrace/Android.mk
+++ b/libbacktrace/Android.mk
@@ -71,14 +71,22 @@
 build_type := host
 libbacktrace_multilib := both
 include $(LOCAL_PATH)/Android.build.mk
+
+libbacktrace_shared_libraries :=
+
 libbacktrace_static_libraries := \
 	libbase \
 	liblog \
 	libunwind \
+	liblzma \
 
+module := libbacktrace
+build_type := target
 build_target := STATIC_LIBRARY
 include $(LOCAL_PATH)/Android.build.mk
-libbacktrace_static_libraries :=
+build_type := host
+libbacktrace_multilib := both
+include $(LOCAL_PATH)/Android.build.mk
 
 #-------------------------------------------------------------------------
 # The libbacktrace_offline shared library.
@@ -106,7 +114,6 @@
 	libLLVMSupport \
 
 module := libbacktrace_offline
-module_tag := optional
 build_type := target
 build_target := SHARED_LIBRARY
 include $(LOCAL_PATH)/Android.build.mk
@@ -114,6 +121,26 @@
 libbacktrace_multilib := both
 include $(LOCAL_PATH)/Android.build.mk
 
+libbacktrace_offline_shared_libraries :=
+libbacktrace_offline_static_libraries := \
+	libbacktrace \
+	libbase \
+	libcutils \
+	liblog \
+	libunwind \
+	liblzma \
+	libLLVMObject \
+	libLLVMBitReader \
+	libLLVMMC \
+	libLLVMMCParser \
+	libLLVMCore \
+	libLLVMSupport \
+
+module := libbacktrace_offline
+build_type := target
+build_target := STATIC_LIBRARY
+include $(LOCAL_PATH)/Android.build.mk
+
 #-------------------------------------------------------------------------
 # The libbacktrace_test library needed by backtrace_test.
 #-------------------------------------------------------------------------
diff --git a/libnativeloader/native_loader.cpp b/libnativeloader/native_loader.cpp
index 209ff1c..a7a0713 100644
--- a/libnativeloader/native_loader.cpp
+++ b/libnativeloader/native_loader.cpp
@@ -57,7 +57,9 @@
 
 class LibraryNamespaces {
  public:
-  LibraryNamespaces() : initialized_(false) { }
+  LibraryNamespaces() : initialized_(false) {
+    PreloadPublicLibraries();
+  }
 
   android_namespace_t* GetOrCreate(JNIEnv* env, jobject class_loader,
                                    bool is_shared,
@@ -103,15 +105,16 @@
   }
 
  private:
-  bool InitPublicNamespace(const char* library_path) {
-    // Make sure all the public libraries are loaded
+  void PreloadPublicLibraries() {
+    // android_init_namespaces() expects all the public libraries
+    // to be loaded so that they can be found by soname alone.
     std::vector<std::string> sonames = android::base::Split(kPublicNativeLibraries, ":");
     for (const auto& soname : sonames) {
-      if (dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE) == nullptr) {
-        return false;
-      }
+      dlopen(soname.c_str(), RTLD_NOW | RTLD_NODELETE);
     }
+  }
 
+  bool InitPublicNamespace(const char* library_path) {
     // Some apps call dlopen from generated code unknown to linker in which
     // case linker uses anonymous namespace. See b/25844435 for details.
     initialized_ = android_init_namespaces(kPublicNativeLibraries, library_path);
diff --git a/metricsd/uploader/upload_service_test.cc b/metricsd/uploader/upload_service_test.cc
index 70112f4..0f77fe4 100644
--- a/metricsd/uploader/upload_service_test.cc
+++ b/metricsd/uploader/upload_service_test.cc
@@ -304,6 +304,8 @@
   upload_service_->PersistToDisk();
   EXPECT_EQ(
       1, upload_service_->current_log_->uma_proto()->histogram_event().size());
+  // Destroy the old service before creating a new one.
+  upload_service_.reset();
   upload_service_.reset(new UploadService(
       "", base::TimeDelta(), base::TimeDelta(), private_dir_, shared_dir_));
   upload_service_->InitForTest(nullptr);
@@ -325,6 +327,8 @@
   // Write a bogus saved log.
   EXPECT_EQ(5, base::WriteFile(upload_service_->saved_log_path_, "hello", 5));
 
+  // Destroy the old service before creating a new one.
+  upload_service_.reset();
   upload_service_.reset(new UploadService(
       "", base::TimeDelta(), base::TimeDelta(), private_dir_, shared_dir_));