IssueTracker

Jetpack Compose version: 1.7.3

Jetpack Compose component used: Recomposer (?) together with Molecule

Kotlin version: 2.1.20-RC2

Steps to Reproduce or Code Sample to Reproduce: The issue seems to be elusive, no reliable steps to reproduce it, unfortunately.

Original report: https://youtrack.jetbrains.com/issue/IJPL-182261/Possible-deadlock-at-compose.runtime.BroadcastFrameClock

Analysis based on the stack trace:

• (see "DefaultDispatcher-worker-7"): BroadcastFrameClock.sendFrame() resumes a FrameAwaiter while holding BroadcastFrameClock.lock, which then attempts to acquire the Recomposer.stateLock.
• (see "DefaultDispatcher-worker-4"): Recomposer's effectJob completion handler calls runnerJob.cancel(cancellation) while holding stateLock, and that synchronously invokes the completion handler installed by BroadcastFrameClock.withFrameNanos, which attempts to grab its lock to execute awaiters.remove(awaiter).

Stack trace:

Found one Java-level deadlock:
=============================
"DefaultDispatcher-worker-9":
  waiting to lock monitor 0x000060000b66b670 (object 0x000000070e05d760, a androidx.compose.runtime.SynchronizedObject),
  which is held by "DefaultDispatcher-worker-4"

"DefaultDispatcher-worker-4":
  waiting to lock monitor 0x000060000b6734d0 (object 0x000000070e26bac0, a androidx.compose.runtime.SynchronizedObject),
  which is held by "DefaultDispatcher-worker-7"

"DefaultDispatcher-worker-7":
  waiting to lock monitor 0x000060000b66b670 (object 0x000000070e05d760, a androidx.compose.runtime.SynchronizedObject),
  which is held by "DefaultDispatcher-worker-4"

Java stack information for the threads listed above:
===================================================
"DefaultDispatcher-worker-9":
	at androidx.compose.runtime.Recomposer$recompositionRunner$2$unregisterApplyObserver$1.invoke(Recomposer.kt:1647)
	- waiting to lock <0x000000070e05d760> (a androidx.compose.runtime.SynchronizedObject)
	at androidx.compose.runtime.Recomposer$recompositionRunner$2$unregisterApplyObserver$1.invoke(Recomposer.kt:1026)
	at androidx.compose.runtime.snapshots.SnapshotKt.advanceGlobalSnapshot(Snapshot.kt:1946)
	at androidx.compose.runtime.snapshots.SnapshotKt.advanceGlobalSnapshot(Snapshot.kt:1961)
	at androidx.compose.runtime.snapshots.SnapshotKt.access$advanceGlobalSnapshot(Snapshot.kt:1)
	at androidx.compose.runtime.snapshots.Snapshot$Companion.sendApplyNotifications(Snapshot.kt:693)
	at app.cash.molecule.MoleculeKt$launchMolecule$3$1.invokeSuspend(molecule.kt:195)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1186)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)
"DefaultDispatcher-worker-4":
	at androidx.compose.runtime.BroadcastFrameClock$withFrameNanos$2$1.invoke(BroadcastFrameClock.kt:140)
	- waiting to lock <0x000000070e26bac0> (a androidx.compose.runtime.SynchronizedObject)
	at androidx.compose.runtime.BroadcastFrameClock$withFrameNanos$2$1.invoke(BroadcastFrameClock.kt:98)
	at kotlinx.coroutines.CancelHandler$UserSupplied.invoke(CancellableContinuationImpl.kt:667)
	at kotlinx.coroutines.CancellableContinuationImpl.callCancelHandler(CancellableContinuationImpl.kt:239)
	at kotlinx.coroutines.CancellableContinuationImpl.cancel(CancellableContinuationImpl.kt:209)
	at kotlinx.coroutines.CancellableContinuationImpl.parentCancelled$kotlinx_coroutines_core(CancellableContinuationImpl.kt:221)
	at kotlinx.coroutines.ChildContinuation.invoke(CancellableContinuationImpl.kt:698)
	at kotlinx.coroutines.JobSupport.notifyCancelling(JobSupport.kt:1604)
	at kotlinx.coroutines.JobSupport.tryMakeCancelling(JobSupport.kt:826)
	at kotlinx.coroutines.JobSupport.makeCancelling(JobSupport.kt:786)
	at kotlinx.coroutines.JobSupport.cancelImpl$kotlinx_coroutines_core(JobSupport.kt:702)
	at kotlinx.coroutines.JobSupport.parentCancelled(JobSupport.kt:668)
	at kotlinx.coroutines.ChildHandleNode.invoke(JobSupport.kt:1580)
	at kotlinx.coroutines.JobSupport.notifyCancelling(JobSupport.kt:1604)
	at kotlinx.coroutines.JobSupport.tryMakeCancelling(JobSupport.kt:826)
	at kotlinx.coroutines.JobSupport.makeCancelling(JobSupport.kt:786)
	at kotlinx.coroutines.JobSupport.cancelImpl$kotlinx_coroutines_core(JobSupport.kt:702)
	at kotlinx.coroutines.JobSupport.cancelInternal(JobSupport.kt:663)
	at kotlinx.coroutines.JobSupport.cancel(JobSupport.kt:648)
	at androidx.compose.runtime.Recomposer$effectJob$1$1.invoke(Recomposer.kt:260)
	- locked <0x000000070e05d760> (a androidx.compose.runtime.SynchronizedObject)
	at androidx.compose.runtime.Recomposer$effectJob$1$1.invoke(Recomposer.kt:245)
	at kotlinx.coroutines.InvokeOnCompletion.invoke(JobSupport.kt:1534)
	at kotlinx.coroutines.JobSupport.notifyCompletion(JobSupport.kt:1625)
	at kotlinx.coroutines.JobSupport.completeStateFinalization(JobSupport.kt:316)
	at kotlinx.coroutines.JobSupport.finalizeFinishingState(JobSupport.kt:233)
	at kotlinx.coroutines.JobSupport.continueCompleting(JobSupport.kt:986)
	at kotlinx.coroutines.JobSupport.access$continueCompleting(JobSupport.kt:22)
	at kotlinx.coroutines.JobSupport$ChildCompletion.invoke(JobSupport.kt:1268)
	at kotlinx.coroutines.JobSupport.notifyCompletion(JobSupport.kt:1625)
	at kotlinx.coroutines.JobSupport.completeStateFinalization(JobSupport.kt:316)
	at kotlinx.coroutines.JobSupport.finalizeFinishingState(JobSupport.kt:233)
	at kotlinx.coroutines.JobSupport.tryMakeCompletingSlowPath(JobSupport.kt:946)
	at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:894)
	at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:859)
	at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:99)
	at kotlinx.coroutines.debug.internal.DebugProbesImpl$CoroutineOwner.resumeWith(DebugProbesImpl.kt:545)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:98)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1186)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)
"DefaultDispatcher-worker-7":
	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2.invokeSuspend$fillToInsert(Recomposer.kt:1735)
	- waiting to lock <0x000000070e05d760> (a androidx.compose.runtime.SynchronizedObject)
	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2.access$invokeSuspend$fillToInsert(Recomposer.kt)
	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$1.invoke(Recomposer.kt:660)
	at androidx.compose.runtime.Recomposer$runRecomposeAndApplyChanges$2$1.invoke(Recomposer.kt:585)
	at androidx.compose.runtime.BroadcastFrameClock$FrameAwaiter.resume(BroadcastFrameClock.kt:42)
	at androidx.compose.runtime.BroadcastFrameClock.sendFrame(BroadcastFrameClock.kt:76)
	- locked <0x000000070e26bac0> (a androidx.compose.runtime.SynchronizedObject)
	at app.cash.molecule.GatedFrameClock.sendFrame(GatedFrameClock.kt:65)
	at app.cash.molecule.GatedFrameClock.access$sendFrame(GatedFrameClock.kt:31)
	at app.cash.molecule.GatedFrameClock$1.invokeSuspend(GatedFrameClock.kt:36)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:100)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:610)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:1186)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:775)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:762)

Found 1 deadlock.