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Runtime_34937 and Runtime_33972 JITMinOpts test failures #76344

Description

@BruceForstall

Affected tests:

  • JIT/Regression/JitBlue/Runtime_34937/Runtime_34937/Runtime_34937.sh
  • JIT/Regression/JitBlue/Runtime_33972/Runtime_33972/Runtime_33972.sh

Error: expected string not found in input

Runfo failures in last 30 days (Runtime_34937) and in last 30 days (Runtime_33972) as of 10/3:

  • First occurrences of both failures are in Rolling run 28591 on 9/24
  • 10x Rolling runs affected 9/24-9/28 + couple of PRs (no occurrences 9/28-10/3)

Error example from Console:

  Starting:    JIT.Regression.XUnitWrapper (parallel test collections = on, max threads = 8)
    JIT/Regression/JitBlue/Runtime_34937/Runtime_34937/Runtime_34937.sh [FAIL]
      __tmp1_Runtime_34937.cs:36:12: error: ARM64: expected string not found in input
       // ARM64: {{^ *}} and w1, w0, #15{{$}}
                 ^
      __jit_disasm.out:31:56: note: scanning from here
      ; Assembly listing for method Program:PerformMod_2(int):int
                                                             ^
      __jit_disasm.out:52:2: note: possible intended match here
       and w0, w0, #15
       ^
      
      Input file: __jit_disasm.out
      Check file: __tmp1_Runtime_34937.cs
      
      -dump-input=help explains the following input dump.
      
      Input was:
      <<<<<<

Original Report

Various Linux/Mac arm64/x64 JITMinOpts legs of the jitstress pipeline fail these tests.

https://dev.azure.com/dnceng-public/public/_build/results?buildId=32864&view=ms.vss-test-web.build-test-results-tab&runId=660270&resultId=108719&paneView=dotnet-dnceng.dnceng-build-release-tasks.helix-test-information-tab

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area-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runs

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