Assertion failed 'resumedUseArg->GetNode()->OperIs(GT_LCL_VAR) && resumedDefArg->GetNode()->OperIs(GT_LCL_ADDR) && execArg->GetNode()->OperIs(GT_LCL_VAR) && syncArg->GetNode()->OperIs(GT_LCL_VAR)'

[JulieLeeMSFT]

Summary:
System.Xml.Linq.Misc.Tests crashes (SIGABRT 134) on a JIT assert in importercalls.cpp:7453 (runtime-async resumption) under jitstress. 2 legs.

Failed in (1):

• runtime-coreclr libraries-jitstress 20260731.1

Console Log: Console Log
Source: runtime-coreclr libraries-jitstress / net11.0-linux-Release-arm64-jitstress2_tiered-AzureLinux.3.Arm64.Open / System.Xml.Linq.Misc.Tests

Failed tests:

- net11.0-linux-Release-arm64-jitstress1_tiered-AzureLinux.3.Arm64.Open
- net11.0-linux-Release-arm64-jitstress2_tiered-AzureLinux.3.Arm64.Open
  - System.Xml.Linq.Misc.Tests

Error Message:

Assert failure(PID 13755 [0x000035bb], Thread: 13767 [0x35c7]): Assertion failed 'resumedUseArg->GetNode()->OperIs(GT_LCL_VAR) && resumedDefArg->GetNode()->OperIs(GT_LCL_ADDR) && execArg->GetNode()->OperIs(GT_LCL_VAR) && syncArg->GetNode()->OperIs(GT_LCL_VAR)' in 'System.Xml.Linq.ElementWriter:WriteElementAsync(System.Xml.Linq.XElement,System.Threading.CancellationToken):this' during 'Morph - Inlining' (IL size 262; hash 0xb019379b; Tier1-OSR)

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[JulieLeeMSFT]

@AndyAyersMS, PTAL. It's failing in OSR mode.

[jakobbotsch]

This is runtime async stuff, I'll take a look