Test failure: System.Collections.Concurrent.Tests.ConcurrentBagTests/ManyConcurrentAddsTakes_ForceContentionWithToArray(seconds: 1)

[ghost]

Opened on behalf of @Sunny-pu

The test System.Collections.Concurrent.Tests.ConcurrentBagTests/ManyConcurrentAddsTakes_ForceContentionWithToArray(seconds: 1) has failed.

System.IndexOutOfRangeException : Index was outside the bounds of the array.

    Stack Trace:

       at System.Collections.Concurrent.ConcurrentBag`1.ToArray() in E:\A\_work\1973\s\corefx\src\System.Collections.Concurrent\src\System\Collections\Concurrent\ConcurrentBag.cs:line 346
   at System.Collections.Concurrent.Tests.ProducerConsumerCollectionTests.ManyConcurrentAddsTakes_ForceContentionWithToArray(Double seconds) in E:\A\_work\1973\s\corefx\src\System.Collections.Concurrent\tests\ProducerConsumerCollectionTests.cs:line 910

Build : Master - 20171215.02 (UWP F5 Tests)
Failing configurations:

• Windows.10.Arm64-arm
  • Release

Details:
https://mc.dot.net/#/product/netcore/master/source/official~2Fcorefx~2Fmaster~2F/type/test~2Ffunctional~2Fuwp~2F/build/20171215.02/workItem/System.Collections.Concurrent.Tests/analysis/xunit/System.Collections.Concurrent.Tests.ConcurrentBagTests~2FManyConcurrentAddsTakes_ForceContentionWithToArray(seconds:%201)

[danmoseley]

Seems like corruption in ConcurrentBag as it should be impossible for ToArray() to throw IOORE. I wonder if this is ARM specific.