PGO: libraries test failure on x64 linux

[AndyAyersMS]

One more failure I see every so often:

COMPlus_ReadyToRun=0
COMPlus_TC_QuickJitForLoops=1
COMPlus_TieredCompilation=1
COMPlus_DbgMiniDumpName=/home/helixbot/dotnetbuild/dumps/coredump.%d.dmp
COMPlus_TieredPGO=1
COMPlus_DbgEnableMiniDump=1

dotnet exec --runtimeconfig System.IO.Pipelines.Tests.runtimeconfig.json --depsfile System.IO.Pipelines.Tests.deps.json xunit.console.dll System.IO.Pipelines.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================
/datadisks/disk1/work/A57408E1/w/A14408BC/e /datadisks/disk1/work/A57408E1/w/A14408BC/e
  Discovering: System.IO.Pipelines.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.IO.Pipelines.Tests (found 388 of 393 test cases)
  Starting:    System.IO.Pipelines.Tests (parallel test collections = on, max threads = 2)
    System.IO.Pipelines.Tests.PipelineReaderWriterFacts.ReadAsync_ThrowsIfWriterCompletedWithException [FAIL]
      The collection was expected to contain a single element, but it was empty.
      Stack Trace:
        /_/src/libraries/System.IO.Pipelines/tests/PipeReaderWriterFacts.cs(232,0): at System.IO.Pipelines.Tests.PipelineReaderWriterFacts.ReadAsync_ThrowsIfWriterCompletedWithException()
        --- End of stack trace from previous location 

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Issue Details

---

One more failure I see every so often:

COMPlus_ReadyToRun=0
COMPlus_TC_QuickJitForLoops=1
COMPlus_TieredCompilation=1
COMPlus_DbgMiniDumpName=/home/helixbot/dotnetbuild/dumps/coredump.%d.dmp
COMPlus_TieredPGO=1
COMPlus_DbgEnableMiniDump=1

dotnet exec --runtimeconfig System.IO.Pipelines.Tests.runtimeconfig.json --depsfile System.IO.Pipelines.Tests.deps.json xunit.console.dll System.IO.Pipelines.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing 
popd
===========================================================================================================
/datadisks/disk1/work/A57408E1/w/A14408BC/e /datadisks/disk1/work/A57408E1/w/A14408BC/e
  Discovering: System.IO.Pipelines.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.IO.Pipelines.Tests (found 388 of 393 test cases)
  Starting:    System.IO.Pipelines.Tests (parallel test collections = on, max threads = 2)
    System.IO.Pipelines.Tests.PipelineReaderWriterFacts.ReadAsync_ThrowsIfWriterCompletedWithException [FAIL]
      The collection was expected to contain a single element, but it was empty.
      Stack Trace:
        /_/src/libraries/System.IO.Pipelines/tests/PipeReaderWriterFacts.cs(232,0): at System.IO.Pipelines.Tests.PipelineReaderWriterFacts.ReadAsync_ThrowsIfWriterCompletedWithException()
        --- End of stack trace from previous location 

Author:	AndyAyersMS
Assignees:	-
Labels:	area-CodeGen-coreclr, untriaged
Milestone:	-

[AndyAyersMS]

cc @EgorBo

[AndyAyersMS]

This no longer happens and we're monitoring libraries-pgo more closely now. So closing.