JIT: Assertion failed 'optLoopTable[i].lpContainedBy in windows arm64 pgo libraries stress test

[AndyAyersMS]

Arm64 random pgo & gdv assertion failure in System.Globalization.Nls.Tests.dll:

https://dev.azure.com/dnceng/public/_build/results?buildId=1344008&view=ms.vss-test-web.build-test-results-tab

COMPlus_JitRandomEdgeCounts=1
COMPlus_JitRandomGuardedDevirtualization=1
COMPlus_ReadyToRun=0
COMPlus_TC_QuickJitForLoops=1
COMPlus_TieredCompilation=1
COMPlus_TieredPGO=1

Assert failure(PID 11716 [0x00002dc4], Thread: 8520 [0x2148]): Assertion failed 'optLoopTable[i].lpContainedBy(first, bottom)' in 'System.String:SplitInternal(System.ReadOnlySpan`1[Char],int,int):System.String[]:this' during 'Find loops' (IL size 224)

    File: D:\workspace\_work\1\s\src\coreclr\jit\optimizer.cpp Line: 1099
    Image: D:\h\w\A5F50952\p\dotnet.exe

[ghost]

Tagging subscribers to this area: @JulieLeeMSFT
See info in area-owners.md if you want to be subscribed.

Issue Details

---

Arm64 random pgo & gdv assertion failure in System.Globalization.Nls.Tests.dll:

https://dev.azure.com/dnceng/public/_build/results?buildId=1344008&view=ms.vss-test-web.build-test-results-tab

COMPlus_JitRandomEdgeCounts=1
COMPlus_JitRandomGuardedDevirtualization=1
COMPlus_ReadyToRun=0
COMPlus_TC_QuickJitForLoops=1
COMPlus_TieredCompilation=1
COMPlus_TieredPGO=1

Assert failure(PID 11716 [0x00002dc4], Thread: 8520 [0x2148]): Assertion failed 'optLoopTable[i].lpContainedBy(first, bottom)' in 'System.String:SplitInternal(System.ReadOnlySpan`1[Char],int,int):System.String[]:this' during 'Find loops' (IL size 224)

    File: D:\workspace\_work\1\s\src\coreclr\jit\optimizer.cpp Line: 1099
    Image: D:\h\w\A5F50952\p\dotnet.exe

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

[AndyAyersMS]

Marking as 7.0 for now.

[AndyAyersMS]

This hasn't failed recently so will close.

There is a similar looking failure over in #65688.

[AndyAyersMS]

Actually, I found a recent one (windows x86):

https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-heads-main-6902db2ad7f4420a88/System.Text.RegularExpressions.Tests/1/console.ef8c2154.log?%3F%253Fsv%253D2019-07-07%2526se%253D2022-05-06T17%25253A33%25253A24Z%2526sr%253Dc%2526sp%253Drl%2526sig%253DM2y1OqaF1O3uca%25252FWSO6CdxlSMMDdu8AXOppRyZJmvVM%25253D

via

https://runfo.azurewebsites.net/search/helix-logs/?bq=started%3A%7E14+definition%3A1002+result%3A%21Succeeded&lq=started%3A%7E14+logKind%3Aconsole+text%3A%22optLoopTable%22

set COMPlus_TieredCompilation=1
set COMPlus_ReadyToRun=0
set COMPlus_TC_QuickJitForLoops=1
set COMPlus_TieredPGO=1
set COMPlus_JitRandomGuardedDevirtualization=1
set COMPlus_JitRandomEdgeCounts=1

  Discovering: System.Text.RegularExpressions.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  System.Text.RegularExpressions.Tests (found 284 of 315 test cases)
  Starting:    System.Text.RegularExpressions.Tests (parallel test collections = on, max threads = 4)

Assert failure(PID 3912 [0x00000f48], Thread: 2388 [0x0954]): Assertion failed 'optLoopTable[i].lpContainedBy(top, bottom)' in 'Microsoft.CodeAnalysis.CSharp.NullableWalker:Scan(byref):System.Collections.Immutable.ImmutableArray`1[[Microsoft.CodeAnalysis.CSharp.AbstractFlowPass`2+PendingBranch[[Microsoft.CodeAnalysis.CSharp.NullableWalker+LocalState, Microsoft.CodeAnalysis.CSharp, Version=4.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35],[Microsoft.CodeAnalysis.CSharp.NullableWalker+LocalFunctionState, Microsoft.CodeAnalysis.CSharp, Version=4.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]], Microsoft.CodeAnalysis.CSharp, Version=4.3.0.0, Culture=neutral, PublicKeyToken=31bf3856ad364e35]]:this' during 'Find loops' (IL size 295; hash 0xe1d27c16; Tier1)