diff --git a/adb/Android.bp b/adb/Android.bp
index cb5c1df..f8e5b38 100644
--- a/adb/Android.bp
+++ b/adb/Android.bp
@@ -567,7 +567,6 @@
 cc_binary {
     name: "adbd",
     defaults: ["adbd_defaults", "host_adbd_supported", "libadbd_binary_dependencies"],
-    stl: "libc++_static",
     recovery_available: true,
     apex_available: ["com.android.adbd"],
 
diff --git a/adb/daemon/usb.cpp b/adb/daemon/usb.cpp
index 7fff05a..a663871 100644
--- a/adb/daemon/usb.cpp
+++ b/adb/daemon/usb.cpp
@@ -231,7 +231,14 @@
                 offset += write_size;
             }
         }
-        SubmitWrites();
+
+        // Wake up the worker thread to submit writes.
+        uint64_t notify = 1;
+        ssize_t rc = adb_write(worker_event_fd_.get(), &notify, sizeof(notify));
+        if (rc < 0) {
+            PLOG(FATAL) << "failed to notify worker eventfd to submit writes";
+        }
+
         return true;
     }
 
@@ -443,6 +450,9 @@
                 }
 
                 ReadEvents();
+
+                std::lock_guard<std::mutex> lock(write_mutex_);
+                SubmitWrites();
             }
         });
     }
@@ -626,8 +636,6 @@
         write_requests_.erase(it);
         size_t outstanding_writes = --writes_submitted_;
         LOG(DEBUG) << "USB write: reaped, down to " << outstanding_writes;
-
-        SubmitWrites();
     }
 
     IoWriteBlock CreateWriteBlock(std::shared_ptr<Block> payload, size_t offset, size_t len,
diff --git a/libstats/pull/Android.bp b/libstats/pull/Android.bp
index 2658639..a8b4a4f 100644
--- a/libstats/pull/Android.bp
+++ b/libstats/pull/Android.bp
@@ -85,13 +85,18 @@
         "libstatssocket",
     ],
     test_suites: ["general-tests", "mts"],
+    test_config: "libstatspull_test.xml",
+
     //TODO(b/153588990): Remove when the build system properly separates 
     //32bit and 64bit architectures.
     compile_multilib: "both",
     multilib: {
         lib64: {
             suffix: "64",
-        }
+        },
+        lib32: {
+            suffix: "32",
+        },
     },
     cflags: [
         "-Wall",
diff --git a/libstats/pull/libstatspull_test.xml b/libstats/pull/libstatspull_test.xml
new file mode 100644
index 0000000..233fc1f
--- /dev/null
+++ b/libstats/pull/libstatspull_test.xml
@@ -0,0 +1,37 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 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.
+-->
+<configuration description="Runs libstatspull_test.">
+    <option name="test-suite-tag" value="apct" />
+    <option name="test-suite-tag" value="apct-native" />
+    <option name="test-suite-tag" value="mts" />
+
+    <target_preparer class="com.android.tradefed.targetprep.RootTargetPreparer"/>
+
+    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.FilePusher">
+       <option name="cleanup" value="true" />
+       <option name="push" value="libstatspull_test->/data/local/tmp/libstatspull_test" />
+       <option name="append-bitness" value="true" />
+    </target_preparer>
+
+    <test class="com.android.tradefed.testtype.GTest" >
+        <option name="native-test-device-path" value="/data/local/tmp" />
+        <option name="module-name" value="libstatspull_test" />
+    </test>
+
+    <object type="module_controller" class="com.android.tradefed.testtype.suite.module.MainlineTestModuleController">
+        <option name="mainline-module-package-name" value="com.google.android.os.statsd" />
+    </object>
+</configuration>
diff --git a/libstats/socket/Android.bp b/libstats/socket/Android.bp
index 4e89b94..2bf0261 100644
--- a/libstats/socket/Android.bp
+++ b/libstats/socket/Android.bp
@@ -127,13 +127,17 @@
         "libutils",
     ],
     test_suites: ["device-tests", "mts"],
+    test_config: "libstatssocket_test.xml",
     //TODO(b/153588990): Remove when the build system properly separates 
     //32bit and 64bit architectures.
     compile_multilib: "both",
     multilib: {
         lib64: {
             suffix: "64",
-        }
+        },
+        lib32: {
+            suffix: "32",
+        },
     },
     require_root: true,
 }
diff --git a/libstats/socket/libstatssocket_test.xml b/libstats/socket/libstatssocket_test.xml
new file mode 100644
index 0000000..d2694d1
--- /dev/null
+++ b/libstats/socket/libstatssocket_test.xml
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2020 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.
+-->
+<configuration description="Runs libstatssocket_test.">
+    <option name="test-suite-tag" value="apct" />
+    <option name="test-suite-tag" value="apct-native" />
+    <option name="test-suite-tag" value="mts" />
+
+    <target_preparer class="com.android.tradefed.targetprep.RootTargetPreparer"/>
+
+    <target_preparer class="com.android.compatibility.common.tradefed.targetprep.FilePusher">
+       <option name="cleanup" value="true" />
+       <option name="push" value="libstatssocket_test->/data/local/tmp/libstatssocket_test" />
+       <option name="append-bitness" value="true" />
+    </target_preparer>
+
+    <test class="com.android.tradefed.testtype.GTest" >
+        <option name="native-test-device-path" value="/data/local/tmp" />
+        <option name="module-name" value="libstatssocket_test" />
+    </test>
+
+    <object type="module_controller" class="com.android.tradefed.testtype.suite.module.MainlineTestModuleController">
+        <option name="mainline-module-package-name" value="com.google.android.os.statsd" />
+    </object>
+</configuration>
+