Transient failure in test AsyncIteratorWithCustomCode

[jcouv]

Link for all failures of this type.

In the Windows CoreClr Debug CI leg of PR #34141, the AsyncIteratorWithCustomCode failed.

Failing build20190316.11

Error message:
System.InvalidOperationException : Operation is not valid due to the current state of the object.

Stack trace

   at System.Threading.Tasks.Sources.ManualResetValueTaskSourceCoreShared.ThrowInvalidOperationException()
    at System.Threading.Tasks.Sources.ManualResetValueTaskSourceCoreShared.CompletionSentinel(Object _)    at System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore`1.InvokeContinuation()

    at System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore`1.SignalCompletion()
    at System.Threading.Tasks.Sources.ManualResetValueTaskSourceCore`1.SetResult(TResult result)
    at C.<Main>g__local|0_0()
    at System.Runtime.CompilerServices.AsyncMethodBuilderCore.Start[TStateMachine](TStateMachine& stateMachine)
    at System.Runtime.CompilerServices.AsyncIteratorMethodBuilder.MoveNext[TStateMachine](TStateMachine& stateMachine)
    at C.<Main>g__local|0_0()
    at C.Main()
    at C.Main()
    at C.<Main>()

Runfo Tracking Issue: Test failure in TestGetAsyncEnumeratorPatternOnRange

Build	Definition	Kind	Run Name

Build Result Summary

Day Hit Count	Week Hit Count	Month Hit Count
0	0	0

[jcouv]

Have not observed this failure since the issue was filed. Closing

[tmat]

Hit this again: https://dev.azure.com/dnceng/public/_build/results?buildId=455777&view=ms.vss-test-web.build-test-results-tab&runId=14537652&resultId=106968&paneView=debug:

[333fred]

Hit this again: https://dev.azure.com/dnceng/public/_build/results?buildId=834232&view=artifacts&type=publishedArtifacts

[sharwell]

The underlying issue here is affecting multiple tests.

[vatsalyaagrawal]

@jcouv this issue was hit twice in month of Oct. Please take a look.

[jcouv]

I looked at the artifacts of builds 1471692, 1471568, 1471568, 1468541, 1463207, 1460280, 1428250 linked in OP today. Only 1460280 had some dump files and none of them seem related to the stacktrace in OP.
Will follow-up with Jared on how to get more information once he's back from training.

[jasonmalinowski]

@jcouv @jaredpar Were you able to make some progress with this issue?

[jcouv]

From discussion with Stephen, I'll update the source code that tests use for ManualResetValueTaskSourceCore (may contain a bug) and I'll instrument the async-iterator tests to capture a crash dump.

[jcouv]

Yay, hit zero occurrences for a month. Closing the issue.
FYI @stephentoub Updating our ManualResetValueTaskSourceCore source did the trick.

[stephentoub]

FYI @stephentoub Updating our ManualResetValueTaskSourceCore source did the trick.

Excellent, glad to hear it.