Test failure System.Threading.Tasks.Tests.CancellationTokenTests.CancellationTokenSource_CancelAsync_AllCallbacksInvoked

[BruceForstall]

I'm seeing this fail in a number of different pipelines and configurations:

net8.0-windows-Release-x86-CoreCLR_checked-jitstress1_tiered-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=171836&view=ms.vss-test-web.build-test-results-tab&runId=3435658&paneView=debug&resultId=147624

net8.0-windows-Release-x64-CoreCLR_checked-jitminopts-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=170968&view=ms.vss-test-web.build-test-results-tab&runId=3423564&paneView=debug&resultId=158777

net8.0-windows-Release-x86-CoreCLR_checked-jitstress1_tiered-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=171836&view=ms.vss-test-web.build-test-results-tab&runId=3435658&paneView=debug&resultId=147624

net8.0-windows-Release-x64-CoreCLR_checked-jitminopts-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=170968&view=ms.vss-test-web.build-test-results-tab&runId=3423564&paneView=debug&resultId=158777

Sample output:

    System.Threading.Tasks.Tests.CancellationTokenTests.CancellationTokenSource_CancelAsync_AllCallbacksInvoked [FAIL]
      System.AggregateException : One or more errors occurred. (One or more errors occurred. (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure


... thousands more lines ...

Tagging subscribers to this area: @dotnet/area-system-threading-tasks
See info in area-owners.md if you want to be subscribed.

Issue Details

---

I'm seeing this fail in a number of different pipelines and configurations:

net8.0-windows-Release-x86-CoreCLR_checked-jitstress1_tiered-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=171836&view=ms.vss-test-web.build-test-results-tab&runId=3435658&paneView=debug&resultId=147624

net8.0-windows-Release-x64-CoreCLR_checked-jitminopts-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=170968&view=ms.vss-test-web.build-test-results-tab&runId=3423564&paneView=debug&resultId=158777

net8.0-windows-Release-x86-CoreCLR_checked-jitstress1_tiered-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=171836&view=ms.vss-test-web.build-test-results-tab&runId=3435658&paneView=debug&resultId=147624

net8.0-windows-Release-x64-CoreCLR_checked-jitminopts-Windows.10.Amd64.Open
https://dev.azure.com/dnceng-public/public/_build/results?buildId=170968&view=ms.vss-test-web.build-test-results-tab&runId=3423564&paneView=debug&resultId=158777

Sample output:

    System.Threading.Tasks.Tests.CancellationTokenTests.CancellationTokenSource_CancelAsync_AllCallbacksInvoked [FAIL]
      System.AggregateException : One or more errors occurred. (One or more errors occurred. (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure
      Expected: Not 13
      Actual:   13) (Assert.NotEqual() Failure


... thousands more lines ...

Author:	BruceForstall
Assignees:	-
Labels:	area-System.Threading.Tasks, blocking-clean-ci-optional
Milestone:	-