java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #2736

auras · 2021-05-31T08:07:36Z

21:05:05	ERROR:	AndroidRuntime : kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[Dispatchers.IO, Continuation at kotlinx.coroutines.channels.AbstractChannel.receiveCatching-JP2dKIU(AbstractChannel.kt:632)@8d8755]){Completed}@c3cb56a. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.DispatchedTask.handleFatalException(DispatchedTask.kt:144)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:115)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
21:05:05	ERROR:	AndroidRuntime : Caused by: java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.kt:108)
21:05:05	ERROR:	AndroidRuntime : at kotlin.coroutines.jvm.internal.ContinuationImpl.releaseIntercepted(ContinuationImpl.kt:118)
21:05:05	ERROR:	AndroidRuntime : at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:39)
21:05:05	ERROR:	AndroidRuntime : at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
21:05:05	ERROR:	AndroidRuntime : ... 4 more

kotlin version: 1.5.10
coroutines version: 1.5.0

I'm not sure how to reproduce, it sometimes happens during espresso tests

The text was updated successfully, but these errors were encountered:

kozaxinan · 2021-06-04T11:06:37Z

We still don't have reproducible case but all of our crashes happen in background. Is it same for everyone?

qwwdfsad · 2021-06-04T11:21:22Z

It would be really helpful if anybody could provide a reproduced even if it's a set of espresso tests that fail 1 in 1000 times.
Without that, it's quite hard to do anything meaningful about this error

kozaxinan · 2021-06-04T12:14:16Z

Last 2 days we are working on reproducing but we had not luck. Only interesting thing is it only happens background according to firebase crashlytics.

We are downgrading kotlin and coroutine. We don't have any reproducible case. We can try kotlin 1.5.20 when it is released.

kozaxinan · 2021-06-04T12:28:34Z

This issue looks similar to #2719. Is there any version of kotlin released with fix of https://youtrack.jetbrains.com/issue/KT-45685?

qwwdfsad · 2021-06-04T12:54:10Z

The fix will be released with Kotlin 1.5.20-RC (~roughly next week)

auras · 2021-06-14T07:45:58Z

Still crashes with Kotlin 1.5.20-RC

kozaxinan · 2021-06-14T14:47:52Z

@auras Do you have reproducible case? And dont we need to have a coroutine release with 1.5.20 to test this issue again?

auras · 2021-06-14T17:08:27Z

Not reliably, no. But if I run the app/test I'm working on a few times it will happen. Usually during app launch.

I thought since it was a kotlin issue, no coroutines release was required.

qwwdfsad · 2021-06-15T12:55:21Z

@auras are these tests run on JVM or in an emulator?

It could be some tricky race in kotlinx.coroutine, so even if it's reproducible 1/50 runs, I still would like to investigate it, especially if you could provide any reproducer

auras · 2021-06-15T13:21:50Z

@qwwdfsad running on both emulator and real devices

I can provide apks but not source code

qwwdfsad · 2021-06-15T13:27:03Z

Does it reproduce when running unit-tests locally, not on an emulator, but on plain JVM?

auras · 2021-06-15T18:39:37Z

I never saw it when running unit tests. We usually run those with TestCoroutineScope, runBlocking

denis-bezrukov · 2021-06-16T09:24:31Z

In our android app it crashes when using stateflow/sharedflow + debounce. So I was able to repro this with just launching ton of different coroutines which use stateflow+debounce.

class TestRunner(private val scope: CoroutineScope) {

    fun run() {
        scope.launch {
            runStressTest()
        }
    }

    suspend fun runStressTest() = withContext(Dispatchers.Default) {
        repeat(100) { a ->
            repeat(100) { b ->
                launch {
                    runStressTestOnce((a + 1) * 10, (b + 1) * 10)
                }
            }
        }
    }

    suspend fun runStressTestOnce(delay: Int, debounce: Int) = coroutineScope {
        val stateflow = MutableStateFlow(0)
        launch {
            repeat(Integer.MAX_VALUE) { i ->
                stateflow.emit(i)
                delay(delay.toLong())
            }
        }
        var last = 0
        stateflow.debounce(debounce.toLong()).collect { i ->
            if (i - last > 100) {
                println("${delay}x${debounce} => $i")
                last = i
            }
        }
    }
}

Then I ran TestRunner(scope).run() in Application.

it's always (5 out 5 launches) crashing with the following stacktrace:

java.lang.IllegalStateException: Inconsistent state CancellableContinuation(DispatchedContinuation[Dispatchers.Default, Continuation at kotlinx.coroutines.flow.StateFlowImpl.collect(StateFlow.kt:353)@deec246]){Active}@5fe3c07
        at kotlinx.coroutines.internal.DispatchedContinuation.tryReleaseClaimedContinuation(DispatchedContinuation.kt:169)
        at kotlinx.coroutines.CancellableContinuationImpl.releaseClaimedReusableContinuation(CancellableContinuationImpl.kt:323)
        at kotlinx.coroutines.CancellableContinuationImpl.getResult(CancellableContinuationImpl.kt:280)
        at kotlinx.coroutines.channels.AbstractSendChannel.sendSuspend(AbstractChannel.kt:1152)
        at kotlinx.coroutines.channels.AbstractSendChannel.send(AbstractChannel.kt:136)
        at kotlinx.coroutines.channels.ChannelCoroutine.send(Unknown Source:2)
        at kotlinx.coroutines.flow.FlowKt__DelayKt$debounceInternal$1$values$1$invokeSuspend$$inlined$collect$1.emit(Collect.kt:135)
        at kotlinx.coroutines.flow.StateFlowImpl.collect(StateFlow.kt:348)
        at kotlinx.coroutines.flow.StateFlowImpl$collect$1.invokeSuspend(Unknown Source:15)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
    
    java.lang.IllegalStateException: Inconsistent state CancellableContinuation(DispatchedContinuation[Dispatchers.Default, Continuation at kotlinx.coroutines.flow.StateFlowImpl.collect(StateFlow.kt:353)@deec246]){Active}@5fe3c07
        at kotlinx.coroutines.internal.DispatchedContinuation.tryReleaseClaimedContinuation(DispatchedContinuation.kt:169)
        at kotlinx.coroutines.CancellableContinuationImpl.releaseClaimedReusableContinuation(CancellableContinuationImpl.kt:323)
        at kotlinx.coroutines.CancellableContinuationImpl.getResult(CancellableContinuationImpl.kt:280)
        at kotlinx.coroutines.channels.AbstractSendChannel.sendSuspend(AbstractChannel.kt:1152)
        at kotlinx.coroutines.channels.AbstractSendChannel.send(AbstractChannel.kt:136)
        at kotlinx.coroutines.channels.ChannelCoroutine.send(Unknown Source:2)
        at kotlinx.coroutines.flow.FlowKt__DelayKt$debounceInternal$1$values$1$invokeSuspend$$inlined$collect$1.emit(Collect.kt:135)
        at kotlinx.coroutines.flow.StateFlowImpl.collect(StateFlow.kt:348)
        at kotlinx.coroutines.flow.StateFlowImpl$collect$1.invokeSuspend(Unknown Source:15)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:33)
        at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:106)
        at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
        at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)

denis-bezrukov · 2021-06-16T09:30:16Z

It's reproducible even without launching android app just by adding:

fun main() {
    TestRunner(CoroutineScope(Dispatchers.Default + Job())).run()
    Thread.sleep(1_000_000)
}

qwwdfsad · 2021-06-16T11:38:41Z

Kudos for the self-contained reproducer!

It's hard to tell whether it is a root cause for ClassCastException before further investigation, but it has to be fixed anyway.
Filed #2768

denis-bezrukov · 2021-06-16T11:43:59Z

@qwwdfsad it is, run it multiple times and sometimes it fails with exact classcastexception:
to increase your chances (i don't know why) run more coroutines:

suspend fun runTest() = withContext(Dispatchers.Default) {
        repeat(300) { a ->
            repeat(300) { b ->
                launch {
                    runTestOnce(a + 50, b + 50)
                }
            }
        }
    }

produces

Exception in thread "DefaultDispatcher-worker-8" kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[Dispatchers.Default, Continuation at kotlinx.coroutines.flow.StateFlowImpl.collect(StateFlow.kt:353)@6476f03]){Cancelled}@10ee2b07. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
	at kotlinx.coroutines.DispatchedTask.handleFatalException(DispatchedTask.kt:144)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:115)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.runSafely(CoroutineScheduler.kt:571)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.executeTask(CoroutineScheduler.kt:750)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.runWorker(CoroutineScheduler.kt:678)
	at kotlinx.coroutines.scheduling.CoroutineScheduler$Worker.run(CoroutineScheduler.kt:665)
Caused by: java.lang.ClassCastException: class kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to class kotlinx.coroutines.internal.DispatchedContinuation (kotlin.coroutines.jvm.internal.CompletedContinuation and kotlinx.coroutines.internal.DispatchedContinuation are in unnamed module of loader 'app')
	at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.kt:108)
	at kotlin.coroutines.jvm.internal.ContinuationImpl.releaseIntercepted(ContinuationImpl.kt:118)
	at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:39)
	at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.kt:104)
	... 4 more

in most of the runs (and it fails faster)

qwwdfsad · 2021-06-16T11:46:07Z

Amazing! Looking into it

…nes and await for reusability to have a consistent state Fixes #2736 Fixes #2768

Woren · 2021-07-08T14:39:51Z

Is there any release schedule how often is coroutines library released? This issue hit us very hard, so if we should choose path of building whole library by ourselves or try another fallback (older version, ...). Thanks

gildor · 2021-10-27T09:26:29Z

I have the same issue with Kotlin 1.5.31 and kotlinx.coroutines 1.5.2
Should I report it separately?

kotlinx.coroutines.CoroutinesInternalError: Fatal exception in coroutines machinery for CancellableContinuation(DispatchedContinuation[Dispatchers.Main.immediate, Continuation at com.bandlab.listmanager.pagination.impl.PaginationListManagerImpl.reload$suspendImpl(PaginationListManagerImpl.kt:223)@ed822fb]){Cancelled}@5d18f18. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
        at kotlinx.coroutines.DispatchedTask.handleFatalException(DispatchedTask.kt:144)
        at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:251)
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:161)
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397)
        at kotlinx.coroutines.CancellableContinuationImpl.cancel(CancellableContinuationImpl.kt:183)
        at kotlinx.coroutines.CancellableContinuationImpl.parentCancelled$kotlinx_coroutines_core(CancellableContinuationImpl.kt:190)
        at kotlinx.coroutines.ChildContinuation.invoke(JobSupport.kt:1474)
        at kotlinx.coroutines.JobSupport.completeStateFinalization(JobSupport.kt:318)
        at kotlinx.coroutines.JobSupport.tryFinalizeSimpleState(JobSupport.kt:295)
        at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:856)
        at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:828)
        at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46)
        at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:234)
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:166)
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:431)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:420)
        at kotlinx.coroutines.CancellableContinuationImpl.resumeUndispatched(CancellableContinuationImpl.kt:518)
        at kotlinx.coroutines.android.HandlerContext$scheduleResumeAfterDelay$$inlined$Runnable$1.run(Runnable.kt:19)
        at android.os.Handler.handleCallback(Handler.java:938)
        at android.os.Handler.dispatchMessage(Handler.java:99)
        at android.os.Looper.loopOnce(Looper.java:201)
        at android.os.Looper.loop(Looper.java:288)
        at android.app.ActivityThread.main(ActivityThread.java:7842)
        at java.lang.reflect.Method.invoke(Native Method)
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548)
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)
     Caused by: java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation
        at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.kt:107)
        at kotlin.coroutines.jvm.internal.ContinuationImpl.releaseIntercepted(ContinuationImpl.kt:118)
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:39)
        at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:234)
        at kotlinx.coroutines.DispatchedTaskKt.resumeUnconfined(DispatchedTask.kt:190)
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:161) 
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397) 
        at kotlinx.coroutines.CancellableContinuationImpl.cancel(CancellableContinuationImpl.kt:183) 
        at kotlinx.coroutines.CancellableContinuationImpl.parentCancelled$kotlinx_coroutines_core(CancellableContinuationImpl.kt:190) 
        at kotlinx.coroutines.ChildContinuation.invoke(JobSupport.kt:1474) 
        at kotlinx.coroutines.JobSupport.completeStateFinalization(JobSupport.kt:318) 
        at kotlinx.coroutines.JobSupport.tryFinalizeSimpleState(JobSupport.kt:295) 
        at kotlinx.coroutines.JobSupport.tryMakeCompleting(JobSupport.kt:856) 
        at kotlinx.coroutines.JobSupport.makeCompletingOnce$kotlinx_coroutines_core(JobSupport.kt:828) 
        at kotlinx.coroutines.AbstractCoroutine.resumeWith(AbstractCoroutine.kt:100) 
        at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(ContinuationImpl.kt:46) 
        at kotlinx.coroutines.DispatchedTaskKt.resume(DispatchedTask.kt:234) 
        at kotlinx.coroutines.DispatchedTaskKt.dispatch(DispatchedTask.kt:166) 
        at kotlinx.coroutines.CancellableContinuationImpl.dispatchResume(CancellableContinuationImpl.kt:397) 
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl(CancellableContinuationImpl.kt:431) 
        at kotlinx.coroutines.CancellableContinuationImpl.resumeImpl$default(CancellableContinuationImpl.kt:420) 
        at kotlinx.coroutines.CancellableContinuationImpl.resumeUndispatched(CancellableContinuationImpl.kt:518) 
        at kotlinx.coroutines.android.HandlerContext$scheduleResumeAfterDelay$$inlined$Runnable$1.run(Runnable.kt:19) 
        at android.os.Handler.handleCallback(Handler.java:938) 
        at android.os.Handler.dispatchMessage(Handler.java:99) 
        at android.os.Looper.loopOnce(Looper.java:201) 
        at android.os.Looper.loop(Looper.java:288) 
        at android.app.ActivityThread.main(ActivityThread.java:7842) 
        at java.lang.reflect.Method.invoke(Native Method) 
        at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:548) 
        at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1003)

gildor · 2021-10-29T03:33:40Z

Reported a new issue #3005

Kotlin#2772) * Properly detect non-released reusable continuations in non-reusable ones and await for reusability to have a consistent state * Ensure that the caller to DispatchedContinuation.isReusable is reusable itself * Using the previous invariant, simplify DispatchedContinuation.isReusable to a single null-check * It also restores the invariant that `cc.isReusable() == cc.resumeMode.isReusableMode` Fixes Kotlin#2736 Fixes Kotlin#2768

qwwdfsad added the waiting for clarification label Jun 4, 2021

qwwdfsad mentioned this issue Jun 15, 2021

Exception in coroutines machinery (ClassCastException) affecting only few android 5 users #2763

Closed

qwwdfsad mentioned this issue Jun 16, 2021

tryReleaseClaimedContinuation: java.lang.IllegalStateException: Inconsistent state #2768

Closed

qwwdfsad added a commit that referenced this issue Jun 18, 2021

Properly detect non-released reusable continuations in non-reusable o…

ec73f40

…nes and await for reusability to have a consistent state Fixes #2736 Fixes #2768

qwwdfsad mentioned this issue Jun 18, 2021

Properly detect non-released reusable continuations in non-reusable o… #2772

Merged

dkhalanskyjb mentioned this issue Jun 29, 2021

java.lang.ClassCastException: at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation (CoroutineDispatcher.kt:108) #2793

Closed

qwwdfsad closed this as completed in d2c652e Jul 9, 2021

gildor mentioned this issue Oct 29, 2021

kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #3005

Closed

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java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #2736

java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #2736

auras commented May 31, 2021 •

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gildor commented Oct 29, 2021

java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #2736

java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation #2736

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