Adapter Lifecycle: receive force kill when stuck (c967f125) · Commits · e / os / android_packages_modules_Bluetooth

android/app/src/com/android/bluetooth/btservice/AdapterService.java

+20 −3

Original line number	Diff line number	Diff line
		@@ -151,6 +151,7 @@ import com.android.bluetooth.telephony.BluetoothInCallService;
		import com.android.bluetooth.vc.VolumeControlService;
		import com.android.internal.annotations.GuardedBy;
		import com.android.internal.annotations.VisibleForTesting;
		import com.android.modules.expresslog.Counter;
		import com.android.modules.utils.BackgroundThread;
		import com.android.modules.utils.BytesMatcher;

		@@ -2314,8 +2315,7 @@ public class AdapterService extends Service {
		mService.enforceCallingPermission(
		android.Manifest.permission.BLUETOOTH_PRIVILEGED, null);

		// Post on the main handler to be sure the cleanup has completed before calling exit
		mService.mHandler.post(
		Runnable killAction =
		() -> {
		if (Flags.killInsteadOfExit()) {
		Log.i(TAG, "killBluetoothProcess: Calling killProcess(myPid())");
		@@ -2324,7 +2324,24 @@ public class AdapterService extends Service {
		Log.i(TAG, "killBluetoothProcess: Calling System.exit");
		System.exit(0);
		}
		});
		};

		// Post on the main handler to let the cleanup complete before calling exit
		mService.mHandler.post(killAction);

		try {
		// Wait for Bluetooth to be killed from its main thread
		Thread.sleep(950); // SystemServer is waiting 1000 ms, we need to wait less here
		} catch (InterruptedException e) {
		Log.e(TAG, "killBluetoothProcess: Interrupted while waiting for kill");
		}

		// Bluetooth cannot be killed on the main thread; it is in a deadLock.
		// Trying to recover by killing the Bluetooth from the binder thread.
		// This is bad :(
		Counter.logIncrement("bluetooth.value_kill_from_binder_thread");
		Log.wtf(TAG, "Failed to kill Bluetooth using its main thread. Trying from binder");
		killAction.run();
		}

		@Override

service/src/com/android/server/bluetooth/BluetoothManagerService.java

+48 −43

Original line number	Diff line number	Diff line
		@@ -1244,10 +1244,12 @@ class BluetoothManagerService {
		mAdapterLock.writeLock().lock();
		try {
		mHandler.removeMessages(MESSAGE_BLUETOOTH_STATE_CHANGE);
		if (mAdapter != null) {
		if (mAdapter == null) {
		return;
		}

		try {
		mAdapter.unregisterCallback(
		mBluetoothCallback, mContext.getAttributionSource());
		mAdapter.unregisterCallback(mBluetoothCallback, mContext.getAttributionSource());
		} catch (RemoteException e) {
		Log.e(TAG, "Unable to unregister BluetoothCallback", e);
		}
		@@ -1263,36 +1265,39 @@ class BluetoothManagerService {
		try {
		mAdapter.getAdapterBinder()
		.asBinder()
		.linkToDeath(() -> binderDead.complete(null), 0);
		.linkToDeath(
		() -> {
		Log.i(TAG, "Successfully received Bluetooth death");
		binderDead.complete(null);
		},
		0);
		} catch (RemoteException e) {
		Log.e(TAG, "Failed to linkToDeath", e);
		binderDead.complete(null);
		}

		// Unbind first to avoid receiving "onServiceDisconnected"
		// Unbind first to avoid receiving unwanted "onServiceDisconnected"
		mContext.unbindService(mConnection);

		try {
		// Force kill the bluetooth to make sure the process is not reused.
		// Note that in a perfect world, we should be able to re-init the same process.
		// Unfortunately, this require an heavy rework of the shutdown implementation
		// Force kill Bluetooth to make sure its process is not reused.
		// Note: In a perfect world, we should be able to re-init the same process.
		// Unfortunately, this requires an heavy rework of the Bluetooth app
		// TODO: b/339501753 - Properly stop Bluetooth without killing it
		mAdapter.killBluetoothProcess();

		// if the kill throw, skip waiting as there is no bluetooth to wait for
		binderDead.get(1, TimeUnit.SECONDS);
		} catch (android.os.DeadObjectException e) {
		// Reduce error -> info since Bluetooth may already be dead prior to this call
		// Reduce exception to info and skip waiting (Bluetooth is dead as wanted)
		Log.i(TAG, "Bluetooth already dead 💀");
		} catch (RemoteException e) {
		Log.e(TAG, "Unexpected error when calling killBluetoothProcess", e);
		Log.e(TAG, "Unexpected RemoteException when calling killBluetoothProcess", e);
		} catch (TimeoutException \| InterruptedException \| ExecutionException e) {
		Log.e(TAG, "Bluetooth death not received in time", e);
		Log.e(TAG, "Bluetooth death not received correctly", e);
		}

		mAdapter = null;
		mHandler.removeMessages(MESSAGE_TIMEOUT_BIND);
		}
		} finally {
		mAdapterLock.writeLock().unlock();
		}