ANR in FirebaseApp$GlobalBackgroundStateListener.onBackgroundStateChanged

[sergeys-opera]

[REQUIRED] Step 2: Describe your environment

• Android Studio version: _
• Firebase Component: _ (Database, Firestore, Storage, Functions, etc)
• Component version: _

[REQUIRED] Step 3: Describe the problem

Steps to reproduce:

This is a continuation of the issue #7505 that was closed recently.
I could reproduce this ANR in a debug build and made a thread dump. As you see several threads are dead-locked while a GlobalBackgroundListener being registered.

Relevant Code:

Full thread dump

"pool-3-thread-1@34948" prio=5 tid=0x72 nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 blocks main@34929
	 blocks Measurement Worker@34952
	 waiting for main@34929 to release lock on instance of com.google.android.gms.common.api.internal.BackgroundDetector(id=34973)
	at com.google.android.gms.common.api.internal.BackgroundDetector.initialize(com.google.android.gms:play-services-basement@@18.5.0:1)
	at com.google.firebase.remoteconfig.RemoteConfigComponent$GlobalBackgroundListener.ensureBackgroundListenerIsRegistered(RemoteConfigComponent.java:397)
	at com.google.firebase.remoteconfig.RemoteConfigComponent$GlobalBackgroundListener.access$000(RemoteConfigComponent.java:387)
	at com.google.firebase.remoteconfig.RemoteConfigComponent.<init>(RemoteConfigComponent.java:139)
	at com.google.firebase.remoteconfig.RemoteConfigComponent.<init>(RemoteConfigComponent.java:111)
	at com.google.firebase.remoteconfig.RemoteConfigRegistrar.lambda$getComponents$0(RemoteConfigRegistrar.java:67)
	at com.google.firebase.remoteconfig.RemoteConfigRegistrar$$ExternalSyntheticLambda0.create(D8$$SyntheticClass:0)
	at com.google.firebase.tracing.ComponentMonitor.lambda$processRegistrar$0(ComponentMonitor.java:38)
	at com.google.firebase.tracing.ComponentMonitor$$ExternalSyntheticLambda0.create(D8$$SyntheticClass:0)
	at com.google.firebase.components.ComponentRuntime.lambda$discoverComponents$0$com-google-firebase-components-ComponentRuntime(ComponentRuntime.java:160)
	at com.google.firebase.components.ComponentRuntime$$ExternalSyntheticLambda2.get(D8$$SyntheticClass:0)
	at com.google.firebase.components.Lazy.get(Lazy.java:53)
	  - locked <0x88a1> (a com.google.firebase.components.Lazy)
	at com.google.firebase.components.ComponentRuntime.doInitializeEagerComponents(ComponentRuntime.java:322)
	at com.google.firebase.components.ComponentRuntime.initializeEagerComponents(ComponentRuntime.java:312)
	at com.google.firebase.FirebaseApp.initializeAllApis(FirebaseApp.java:607)
	at com.google.firebase.FirebaseApp.initializeApp(FirebaseApp.java:300)
	at com.google.firebase.FirebaseApp.initializeApp(FirebaseApp.java:264)
	at com.google.firebase.FirebaseApp.initializeApp(FirebaseApp.java:249)
	  - locked <0x889e> (a java.lang.Object)
	at com.opera.celopay.StandaloneCeloPayDependencies.getFirebaseApp(StandaloneCeloPayDependencies.kt:44)
	at com.opera.celopay.AppModuleKt.buildAppModule$lambda$0$8$0(AppModule.kt:112)
	at com.opera.celopay.AppModuleKt.$r8$lambda$c7oG9lXiZ_VyhmxzaDHLtKe994k(Unknown Source:-1)
	at com.opera.celopay.AppModuleKt$$ExternalSyntheticLambda17.invoke(D8$$SyntheticClass:0)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:86)
	  - locked <0x889c> (a kotlin.SynchronizedLazyImpl)
	at com.opera.celopay.model.firebase.base.LazyEmbeddedFirebaseApp.getValue(FirebaseBaseModule.kt:-1)
	at com.opera.celopay.StandaloneCeloPayDependencies.getFirebaseMessaging(StandaloneCeloPayDependencies.kt:48)
	at com.opera.celopay.AppModuleKt.buildAppModule$lambda$0$9(AppModule.kt:116)
	at com.opera.celopay.AppModuleKt.$r8$lambda$hgT0MInAVXUG_KkQquzRGHGjbMI(Unknown Source:-1)
	at com.opera.celopay.AppModuleKt$$ExternalSyntheticLambda15.invoke(D8$$SyntheticClass:0)
	at org.koin.core.instance.InstanceFactory.create(InstanceFactory.kt:49)
	at org.koin.core.instance.SingleInstanceFactory.create(SingleInstanceFactory.kt:46)
	at org.koin.core.instance.SingleInstanceFactory.get$lambda$0(SingleInstanceFactory.kt:55)
	at org.koin.core.instance.SingleInstanceFactory.$r8$lambda$DuRNwghYWsMwMsdJERKYXVNSM_0(SingleInstanceFactory.kt:-1)
	at org.koin.core.instance.SingleInstanceFactory$$ExternalSyntheticLambda0.invoke(D8$$SyntheticClass:0)
	at org.koin.mp.KoinPlatformTools.synchronized(KoinPlatformTools.kt:36)
	  - locked <0x88a2> (a org.koin.core.instance.SingleInstanceFactory)
	at org.koin.core.instance.SingleInstanceFactory.get(SingleInstanceFactory.kt:53)
	at org.koin.core.registry.InstanceRegistry.resolveInstance$koin_core(InstanceRegistry.kt:132)
	at org.koin.core.resolution.CoreResolver.resolveFromRegistry(CoreResolver.kt:87)
	at org.koin.core.resolution.CoreResolver.resolveFromContextOrNull(CoreResolver.kt:74)
	at org.koin.core.resolution.CoreResolver.resolveFromContextOrNull$default(CoreResolver.kt:72)
	at org.koin.core.resolution.CoreResolver.resolveFromContext(CoreResolver.kt:69)
	at org.koin.core.scope.Scope.resolveFromContext(Scope.kt:321)
	at org.koin.core.scope.Scope.stackParametersCall(Scope.kt:284)
	at org.koin.core.scope.Scope.resolveInstance(Scope.kt:270)
	at org.koin.core.scope.Scope.resolve(Scope.kt:243)
	at org.koin.core.scope.Scope.get(Scope.kt:225)
	at com.opera.celopay.model.firebase.notification.FcmModule_androidKt$buildPlatformFirebaseNotificationModule$lambda$0$0$$inlined$inject$default$1.invoke(Scope.kt:144)
	at kotlin.SynchronizedLazyImpl.getValue(LazyJVM.kt:86)
	  - locked <0x8897> (a kotlin.SynchronizedLazyImpl)
	at com.opera.celopay.model.firebase.notification.FcmTokenUpdater$fetchFirebaseToken$1.invokeSuspend(FcmTokenUpdater.kt:30)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"main@34929" prio=5 tid=0x2 nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 blocks pool-3-thread-1@34948
	 waiting for pool-3-thread-1@34948 to release lock on instance of java.lang.Object(id=34974)
	at com.google.firebase.FirebaseApp$GlobalBackgroundStateListener.onBackgroundStateChanged(FirebaseApp.java:708)
	at com.google.android.gms.common.api.internal.BackgroundDetector.zza(com.google.android.gms:play-services-basement@@18.5.0:3)
	  - locked <0x889d> (a com.google.android.gms.common.api.internal.BackgroundDetector)
	at com.google.android.gms.common.api.internal.BackgroundDetector.onTrimMemory(com.google.android.gms:play-services-basement@@18.5.0:3)
	at android.content.ComponentCallbacksController.lambda$dispatchTrimMemory$1(ComponentCallbacksController.java:109)
	at android.content.ComponentCallbacksController$$ExternalSyntheticLambda1.accept(D8$$SyntheticClass:0)
	at android.content.ComponentCallbacksController.forAllComponentCallbacks(ComponentCallbacksController.java:124)
	at android.content.ComponentCallbacksController.dispatchTrimMemory(ComponentCallbacksController.java:107)
	at android.app.Application.onTrimMemory(Application.java:289)
	at android.app.ActivityThread.handleTrimMemory(ActivityThread.java:6993)
	at android.app.ActivityThread.-$$Nest$mhandleTrimMemory(ActivityThread.java:-1)
	at android.app.ActivityThread$ApplicationThread.$r8$lambda$G6hCvS-Qza2XVRHE5EG8OQS6lcg(ActivityThread.java:-1)
	at android.app.ActivityThread$ApplicationThread$$ExternalSyntheticLambda2.accept(D8$$SyntheticClass:0)
	at com.android.internal.util.function.pooled.PooledLambdaImpl.doInvoke(PooledLambdaImpl.java:281)
	at com.android.internal.util.function.pooled.PooledLambdaImpl.invoke(PooledLambdaImpl.java:204)
	at com.android.internal.util.function.pooled.OmniFunction.run(OmniFunction.java:87)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1406)
	at android.view.Choreographer$CallbackRecord.run(Choreographer.java:1415)
	at android.view.Choreographer.doCallbacks(Choreographer.java:1015)
	at android.view.Choreographer.doFrame(Choreographer.java:947)
	at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:1389)
	at android.os.Handler.handleCallback(Handler.java:959)
	at android.os.Handler.dispatchMessage(Handler.java:100)
	at android.os.Looper.loopOnce(Looper.java:232)
	at android.os.Looper.loop(Looper.java:317)
	at android.app.ActivityThread.main(ActivityThread.java:8592)
	at java.lang.reflect.Method.invoke(Method.java:-1)
	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:580)
	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:878)

"WM.task-4@34944" prio=5 tid=0x6e nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:269)
	at kotlinx.coroutines.BlockingCoroutine.joinBlocking(Builders.kt:97)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking(Builders.kt:70)
	at kotlinx.coroutines.BuildersKt.runBlocking(Unknown Source:1)
	at kotlinx.coroutines.BuildersKt__BuildersKt.runBlocking$default(Builders.kt:48)
	at kotlinx.coroutines.BuildersKt.runBlocking$default(Unknown Source:1)
	at com.opera.celopay.MiniPayKoinWorkerFactory.createWorker(MiniPayKoinWorkerFactory.kt:35)
	at androidx.work.WorkerFactory.createWorkerWithDefaultFallback(WorkerFactory.kt:95)
	at androidx.work.impl.WorkerWrapper.runWorker(WorkerWrapper.kt:234)
	at androidx.work.impl.WorkerWrapper.access$runWorker(WorkerWrapper.kt:67)
	at androidx.work.impl.WorkerWrapper$launch$1$resolution$1.invokeSuspend(WorkerWrapper.kt:98)
	at androidx.work.impl.WorkerWrapper$launch$1$resolution$1.invoke(WorkerWrapper.kt:-1)
	at androidx.work.impl.WorkerWrapper$launch$1$resolution$1.invoke(WorkerWrapper.kt:-1)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndspatched(Undispatched.kt:66)
	at kotlinx.coroutines.intrinsics.UndispatchedKt.startUndispatchedOrReturn(Undispatched.kt:43)
	at kotlinx.coroutines.BuildersKt__Builders_commonKt.withContext(Builders.common.kt:165)
	at kotlinx.coroutines.BuildersKt.withContext(Unknown Source:1)
	at androidx.work.impl.WorkerWrapper$launch$1.invokeSuspend(WorkerWrapper.kt:98)
	at androidx.work.impl.WorkerWrapper$launch$1.invoke(Unknown Source:-1)
	at androidx.work.impl.WorkerWrapper$launch$1.invoke(Unknown Source:-1)
	at androidx.work.ListenableFutureKt$launchFuture$1$2.invokeSuspend(ListenableFuture.kt:42)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:34)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at androidx.work.impl.utils.SerialExecutorImpl$Task.run(SerialExecutorImpl.java:96)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1156)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"Measurement Worker@34952" prio=5 tid=0x78 nid=NA waiting for monitor entry
  java.lang.Thread.State: BLOCKED
	 waiting for pool-3-thread-1@34948 to release lock on instance of java.lang.Object(id=34974)
	at com.google.firebase.FirebaseApp.getInstance(FirebaseApp.java:173)
	at com.google.firebase.installations.FirebaseInstallations.getInstance(FirebaseInstallations.java:195)
	at com.google.firebase.analytics.FirebaseAnalytics.getFirebaseInstanceId(com.google.android.gms:play-services-measurement-api@@23.0.0:1)
	at java.lang.reflect.Method.invoke(Method.java:-1)
	at m7.qi.s(:com.google.android.gms.dynamite_measurementdynamite@254534029@25.45.34 (190400-0):342)
	at m7.vg.q(:com.google.android.gms.dynamite_measurementdynamite@254534029@25.45.34 (190400-0):24)
	at m7.tj.D(:com.google.android.gms.dynamite_measurementdynamite@254534029@25.45.34 (190400-0):81)
	at m7.rg.run(:com.google.android.gms.dynamite_measurementdynamite@254534029@25.45.34 (190400-0):151)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:524)
	at java.util.concurrent.FutureTask.run(FutureTask.java:317)
	at m7.rd.run(:com.google.android.gms.dynamite_measurementdynamite@254534029@25.45.34 (190400-0):48)

"ProcessStablePhenotypeFlag@34953" prio=5 tid=0x79 nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:371)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:519)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3805)
	at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3746)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1707)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:1224)
	at java.util.concurrent.ScheduledThreadPoolExecutor$DelayedWorkQueue.take(ScheduledThreadPoolExecutor.java:953)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1082)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"WM.task-1@34941" prio=5 tid=0x6b nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:371)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:519)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3805)
	at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3746)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1707)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1082)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"WM.task-2@34942" prio=5 tid=0x6c nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:371)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:519)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3805)
	at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3746)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1707)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1082)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"WM.task-3@34943" prio=5 tid=0x6d nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.park(LockSupport.java:371)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionNode.block(AbstractQueuedSynchronizer.java:519)
	at java.util.concurrent.ForkJoinPool.unmanagedBlock(ForkJoinPool.java:3805)
	at java.util.concurrent.ForkJoinPool.managedBlock(ForkJoinPool.java:3746)
	at java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(AbstractQueuedSynchronizer.java:1707)
	at java.util.concurrent.LinkedBlockingQueue.take(LinkedBlockingQueue.java:435)
	at java.util.concurrent.ThreadPoolExecutor.getTask(ThreadPoolExecutor.java:1082)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:651)
	at java.lang.Thread.run(Thread.java:1119)

"FinalizerDaemon@34935" daemon prio=5 tid=0x65 nid=NA waiting
  java.lang.Thread.State: WAITING
	 blocks FinalizerDaemon@34935
	at java.lang.Object.wait(Object.java:-1)
	at java.lang.Object.wait(Object.java:405)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:207)
	  - locked <0x889f> (a java.lang.Object)
	at java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:228)
	at java.lang.Daemons$FinalizerDaemon.runInternal(Daemons.java:348)
	at java.lang.Daemons$Daemon.run(Daemons.java:132)
	at java.lang.Thread.run(Thread.java:1119)

"FinalizerWatchdogDaemon@34936" daemon prio=5 tid=0x66 nid=NA waiting
  java.lang.Thread.State: WAITING
	 blocks FinalizerWatchdogDaemon@34936
	at java.lang.Object.wait(Object.java:-1)
	at java.lang.Object.wait(Object.java:405)
	at java.lang.Object.wait(Object.java:543)
	at java.lang.Daemons$FinalizerWatchdogDaemon.sleepUntilNeeded(Daemons.java:481)
	  - locked <0x88a0> (a java.lang.Daemons$FinalizerWatchdogDaemon)
	at java.lang.Daemons$FinalizerWatchdogDaemon.runInternal(Daemons.java:461)
	at java.lang.Daemons$Daemon.run(Daemons.java:132)
	at java.lang.Thread.run(Thread.java:1119)

"ReferenceQueueDaemon@34934" daemon prio=5 tid=0x64 nid=NA waiting
  java.lang.Thread.State: WAITING
	 blocks ReferenceQueueDaemon@34934
	at java.lang.Object.wait(Object.java:-1)
	at java.lang.Object.wait(Object.java:405)
	at java.lang.Object.wait(Object.java:543)
	at java.lang.Daemons$ReferenceQueueDaemon.runInternal(Daemons.java:260)
	  - locked <0xf5f> (a java.lang.Class)
	at java.lang.Daemons$Daemon.run(Daemons.java:132)
	at java.lang.Thread.run(Thread.java:1119)

"DefaultDispatcher-worker-1@34945" daemon prio=5 tid=0x6f nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:410)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.park(CoroutineScheduler.kt:855)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.tryPark(CoroutineScheduler.kt:803)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:751)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)

"DefaultDispatcher-worker-2@34946" daemon prio=5 tid=0x70 nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:410)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.park(CoroutineScheduler.kt:855)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.tryPark(CoroutineScheduler.kt:803)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:751)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)

"DefaultDispatcher-worker-3@34947" daemon prio=5 tid=0x71 nid=NA waiting
  java.lang.Thread.State: WAITING
	at jdk.internal.misc.Unsafe.park(Unsafe.java:-1)
	at java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:410)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.park(CoroutineScheduler.kt:855)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.tryPark(CoroutineScheduler.kt:803)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:751)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:704)

"GmsDynamite@34950" prio=5 tid=0x76 nid=NA waiting
  java.lang.Thread.State: WAITING
	 blocks GmsDynamite@34950
	at java.lang.Object.wait(Object.java:-1)
	at java.lang.Object.wait(Object.java:405)
	at java.lang.Object.wait(Object.java:543)
	at com.google.android.gms.dynamite.zza.run(com.google.android.gms:play-services-basement@@18.5.0:2)
	  - locked <0x8886> (a com.google.android.gms.dynamite.zza)

"ConnectivityThread@34949" prio=5 tid=0x73 nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	at android.os.MessageQueue.nativePollOnce(MessageQueue.java:-1)
	at android.os.MessageQueue.next(MessageQueue.java:349)
	at android.os.Looper.loopOnce(Looper.java:189)
	at android.os.Looper.loop(Looper.java:317)
	at android.os.HandlerThread.run(HandlerThread.java:85)

"GoogleApiHandler@34951" prio=5 tid=0x77 nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	at android.os.MessageQueue.nativePollOnce(MessageQueue.java:-1)
	at android.os.MessageQueue.next(MessageQueue.java:349)
	at android.os.Looper.loopOnce(Looper.java:189)
	at android.os.Looper.loop(Looper.java:317)
	at android.os.HandlerThread.run(HandlerThread.java:85)

"queued-work-looper@34954" prio=5 tid=0x7a nid=NA runnable
  java.lang.Thread.State: RUNNABLE
	at android.os.MessageQueue.nativePollOnce(MessageQueue.java:-1)
	at android.os.MessageQueue.next(MessageQueue.java:349)
	at android.os.Looper.loopOnce(Looper.java:189)
	at android.os.Looper.loop(Looper.java:317)
	at android.os.HandlerThread.run(HandlerThread.java:85)

"HeapTaskDaemon@34933" daemon prio=5 tid=0x63 nid=NA waiting
  java.lang.Thread.State: WAITING
	at dalvik.system.VMRuntime.runHeapTasks(VMRuntime.java:-1)
	at java.lang.Daemons$HeapTaskDaemon.runInternal(Daemons.java:764)
	at java.lang.Daemons$Daemon.run(Daemons.java:132)
	at java.lang.Thread.run(Thread.java:1119)

"Signal Catcher@34930" daemon prio=10 tid=0x60 nid=NA waiting
  java.lang.Thread.State: WAITING


"ADB-JDWP Connection Control Thread@34931" daemon prio=0 tid=0x61 nid=NA waiting
  java.lang.Thread.State: WAITING


"Jit thread pool worker thread 0@34932" daemon prio=5 tid=0x62 nid=NA runnable
  java.lang.Thread.State: RUNNABLE


"binder:13591_1@34937" prio=5 tid=0x67 nid=NA runnable
  java.lang.Thread.State: RUNNABLE


"binder:13591_2@34938" prio=5 tid=0x68 nid=NA runnable
  java.lang.Thread.State: RUNNABLE


"binder:13591_3@34939" prio=5 tid=0x69 nid=NA runnable
  java.lang.Thread.State: RUNNABLE


"Profile Saver@34940" daemon prio=5 tid=0x6a nid=NA runnable
  java.lang.Thread.State: RUNNABLE


"binder:13591_4@34955" prio=5 tid=0x7b nid=NA runnable
  java.lang.Thread.State: RUNNABLE

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[lehcar09]

Hi @sergeys-opera, Could you provide a code snippet and the steps you've taken to encounter the issue? Aside from that, does the issue occur on certain devices and/or android versions?

In addition to that, does the issue occur on the latest Firebase SDK version? Thanks!

[sergeys-opera]

Could you provide a code snippet and the steps you've taken to encounter the issue?

No, unfortunately I cannot. Dead locks are hard to reproduce in the isolated environment especially with the Firebase SDK that talks to remote servers, etc. I've provided all the details (except of this thread dump) in the other issue I reported: #7505

Aside from that, does the issue occur on certain devices and/or android versions?

We see a lot of ANRs in the Google console happening on various devices and Android versions.

In addition to that, does the issue occur on the latest Firebase SDK version?

The issue occurs in Firebase BoM 34.3.0 which is not the latest but quite fresh.

It should be possible for you (or any other dev with access to the source code) to check what's synchronized inBackgroundDetector.initialize and GlobalBackgroundStateListener.onBackgroundStateChanged.
It seems that BackgroundDetector.initialize locks self (synchronized(this) or similar) and then tries to acquire the global lock of FirebaseApp which is already acquired in GlobalBackgroundStateListener.onBackgroundStateChanged causing a dead lock. I base my assumption on the stack trace and waiting for xxx to release lock on instance of messages in the thread dump provided above.

I've worked around the issue by initializing the Firebase app on the main application thread. Basically circumventing the dead lock by using a single thread. However, the issue might reappear in the future if some project component starts accessing the Firebase instance on a background thread.

[lehcar09]

Deadlocks are indeed quite difficult to reproduce. It’ll really help us a lot to move forward in this investigations if you can share an MCVE or code snippet.

Based on your stacktrace, it looks like you’re using Koin and initializing Firebase manually. Is that correct?

[sergeys-opera]

Based on your stacktrace, it looks like you’re using Koin and initializing Firebase manually. Is that correct?

That is correct.