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

gildor · 2021-10-29T03:33:27Z

I have this crash on runtime with Kotlin 1.5.31 and kotlinx.coroutines 1.5.2. I use BOM for Kotlin and corouties with enforcePlatform, so it looks that correct version is used on runtime

It looks exactly the same as #2736 but this issue was closed and fix available in 1.5.2

So 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)

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

qwwdfsad · 2021-10-29T09:18:41Z

Hi, is there any chance you have a semi-stable reproducer or know the exact pattern of code that triggers this bug?

This is indeed a bug in one of the most concurrent parts of kotlinx.coroutines and we're chasing it without any success yet

gildor · 2021-10-29T09:30:52Z

It crashes in 100% cases, this is quite a complex code, with a few linked scopes when suspend function is passed as lambda to be called on another scope
For now, I work around it by replacing suspend lambda with standard lambda and just launching a new coroutine on a separate scope.

I can try to reproduce, but not sure that it would be easy

qwwdfsad · 2021-10-29T10:07:55Z

It crashes in 100% cases
I can try to reproduce, but not sure that it would be easy

That's really great, it would be drastically helpful for us if you could share it in any form, public or private.
Looking forward to hearing from you!

nomisRev · 2021-10-30T17:26:15Z

I just ran into this issues as well. It's reprducible, but only after x invocations of th property based testing.

Here is the public repo, and a reference to the two failing tests:
https://github.com/nomisRev/Continuation/blob/020b0c0e15786b23927fb94cd8833b6d2230b240/src/commonTest/kotlin/ContSpec.kt#L103

Hope this helps 👍

qwwdfsad · 2021-11-01T09:27:44Z

Thanks @nomisRev! I can verify it's reproducible.

I'm not really familiar with kotest, does it require a special plugin? Because I can run tests from your project only as Gradle task, but cannot e.g. debug it from IDEA

qwwdfsad · 2021-11-01T11:04:42Z

@nomisRev alas this bug has nothing to do with the original one, the reproducer is not using the piece of machinery that is prone to the actual bug.

In your case things are much simpler -- when shift is invoked, the outer continuation is resumed twice.

I would suspect the following function in your implementation:

return suspendCoroutineUninterceptedOrReturn { contB ->
    contB.resumeWithException(ShiftCancellationException(token))
    COROUTINE_SUSPENDED
}

You first resume the contB and then return COROUTINE_SUSPENDED, effectively confusing the caller.
suspendCoroutineUninterceptedOrReturn does not have any additional guards against such misuses (that's why it is hidden in the first place), thus leading to undefined and racy behaviour.

I suggest using suspendCoroutine instead in your implementation.

nomisRev · 2021-11-01T18:53:40Z

Okay, I see. Thank you so much for the pointer @qwwdfsad! Changing it, and solved the problem! My apologies, I hoped I was able to help with a reproduceable example.

I guess since I want to avoid the call to intercepted() and wrapping in SafeContinuation I should have just used throw ShiftCancellationException(token) to begin with, since it needs to cancel the coroutine shift was called to support structured concurrency test.

Can I ask you an unrelated question about Kotlin coroutines cancellation? documented here.

qwwdfsad · 2021-11-01T22:29:50Z

Can I ask you an unrelated question about Kotlin coroutines cancellation? documented here.

Sure, you can reach me out in public Slack (Vsevolod Tolstopyatov [JB]). I'm out of the context of what this code actually does and in need of some details to actually answer that

joharei · 2021-12-09T11:42:21Z

I'm also encountering this in my production app, but haven't been able to reproduce it, as it's happening in some bluetooth communication code that's hard to test at scale.

Stacktrace

Fatal Exception: kotlin.NotImplementedError: Fatal exception in coroutines machinery for DispatchedContinuation[g0@e10a02f, Continuation at com.juul.kable.AndroidPeripheral.write(Peripheral.kt)@55aed1a]. Please read KDoc to 'handleFatalException' method and report this incident to maintainers
       at kotlinx.coroutines.DispatchedTask.handleFatalException(DispatchedTask.java:144)
       at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.java:115)
       at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.java:81)
       at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.java:41)
       at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.java:57)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:247)
       at android.app.ActivityThread.main(ActivityThread.java:8656)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)
    Caused by java.lang.ClassCastException: kotlin.coroutines.jvm.internal.CompletedContinuation cannot be cast to kotlinx.coroutines.internal.DispatchedContinuation
       at kotlinx.coroutines.CoroutineDispatcher.releaseInterceptedContinuation(CoroutineDispatcher.java:107)
       at kotlin.coroutines.jvm.internal.ContinuationImpl.releaseIntercepted(ContinuationImpl.java:118)
       at kotlin.coroutines.jvm.internal.BaseContinuationImpl.resumeWith(BaseContinuationImpl.java:39)
       at kotlinx.coroutines.DispatchedTask.run(DispatchedTask.java:233)
       at androidx.compose.ui.platform.AndroidUiDispatcher.performTrampolineDispatch(AndroidUiDispatcher.java:81)
       at androidx.compose.ui.platform.AndroidUiDispatcher.access$performTrampolineDispatch(AndroidUiDispatcher.java:41)
       at androidx.compose.ui.platform.AndroidUiDispatcher$dispatchCallback$1.run(AndroidUiDispatcher.java:57)
       at android.os.Handler.handleCallback(Handler.java:938)
       at android.os.Handler.dispatchMessage(Handler.java:99)
       at android.os.Looper.loop(Looper.java:247)
       at android.app.ActivityThread.main(ActivityThread.java:8656)
       at java.lang.reflect.Method.invoke(Method.java)
       at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:602)
       at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1130)

Having a look at previous issues #2719 and #2736 suggests that this could be caused by using inline suspend functions or inline classes, and both are used in the function where this is happening.

I found this issue, that seems pretty similar to me. I can confirm that the reproducer in the comments still crashes on Kotlin 1.6.0 with coroutines 1.6.0-RC.

Xlopec · 2022-01-04T20:19:42Z

I'm still experiencing this issue, I filled a bug and attached a small reproducer. Recently I tried updating the project to 1.6.10 with coroutines 1.6.0 and eap Ktor... still no luck

qwwdfsad · 2022-01-17T13:46:54Z

@Xlopec thanks for writing here in addition to YT! I've reproduced your problem, it seems to be on the edge of kotlinx.coroutines and Ktor's mechanism of reusing continuations. I'm figuring it out

qwwdfsad · 2022-01-17T14:01:50Z

I've found the root cause: https://youtrack.jetbrains.com/issue/KT-50832

As a workaround, please avoid method-references to suspend inline functions and use a plain lambda instead (e.g. ::WebWebSocketSession -> { WebSocketSession(it) }

yangwuan55 · 2022-03-13T12:33:07Z

any update for this?

yangwuan55 · 2022-03-13T12:37:12Z

I do this code and has same problem in my android project,but I do the single test for the same code the error is gone,hope for a quick settlement.

launch(Dispatchers.Main) {
        //a suspend block from function params
        block()
}

yangwuan55 · 2022-05-22T02:43:22Z

any update?If cant resolve this issue,I have to put away the coroutines.

yangwuan55 · 2022-05-22T02:54:58Z

I've found the root cause: https://youtrack.jetbrains.com/issue/KT-50832

As a workaround, please avoid method-references to suspend inline functions and use a plain lambda instead (e.g. ::WebWebSocketSession -> { WebSocketSession(it) }

I don't use ktor,but I have the same bug,If any update please reply,Thank you very much!

qwwdfsad · 2022-06-07T15:37:05Z

Unfortunately, there are no updates apart from the ones in KT-50832: it will be fixed in 1.7.20, until then it's better to avoid a problematic pattern in your code base.

Also, closing as compiler issue.

yangwuan55 · 2022-06-08T02:33:43Z

Unfortunately, there are no updates apart from the ones in KT-50832: it will be fixed in 1.7.20, until then it's better to avoid a problematic pattern in your code base.

Also, closing as compiler issue.

So my issue is another?But how can I do can avoid?

gildor mentioned this issue Oct 29, 2021

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

Closed

qwwdfsad added the bug label Oct 29, 2021

joharei mentioned this issue Dec 9, 2021

CompletedContinuation cannot be cast to DispatchedContinuation JuulLabs/kable#208

Closed

qwwdfsad self-assigned this Jan 17, 2022

qwwdfsad added the compiler-issue label Jan 31, 2022

buzoherbert mentioned this issue Feb 16, 2022

TestEngine with ID 'kotest' failed to execute tests kotest/kotest#2819

Closed

qwwdfsad closed this as completed Jun 7, 2022

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

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

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

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

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gildor commented Oct 29, 2021

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