Affected tests:

• JIT/Directed/PREFIX/volatile/1/cpblk/cpblk.sh
• JIT\\Directed\\PREFIX\\volatile\\1\\cpblk\\cpblk.cmd

Runfo hits for last 30 days as of 10/3:

• First occurrence on 9/30 in rolling run 36073
• Happened 2x-3x in each Rolling run in last 3 days across various platforms (all are arm64 -- on all platforms - Linux, OSX and Windows)

Original Report

arm64, JitStress

Also fails in MinOpts

https://dev.azure.com/dnceng-public/public/_build/results?buildId=37829&view=ms.vss-test-web.build-test-results-tab&runId=754244&paneView=debug&resultId=108471

Started with 20220929.1 build:
https://dev.azure.com/dnceng-public/public/_build/results?buildId=37829&view=results

Tests:

JIT\Directed\PREFIX\unaligned\2\cpblk\cpblk.cmd
JIT\IL_Conformance\Old\Conformance_Base\ldc_c_cpblk\ldc_c_cpblk.cmd
JIT\Directed\PREFIX\unaligned\4\cpblk\cpblk.cmd
JIT\IL_Conformance\Old\Base\cpblk\cpblk.cmd
JIT\IL_Conformance\Old\Conformance_Base\c_cpblk\c_cpblk.cmd
JIT\IL_Conformance\Old\Conformance_Base\cpblk\cpblk.cmd
JIT\Directed\PREFIX\unaligned\1\cpblk\cpblk.cmd

Example:

  Starting:    JIT.Directed.XUnitWrapper (parallel test collections = on, max threads = 8)
    JIT\Directed\PREFIX\unaligned\4\cpblk\cpblk.cmd [FAIL]
      Fatal error. System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
         at _cpblk.main(System.String[])

@dotnet/jit-contrib

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Summary