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Assert failure "!CREATE_CHECK_STRING(pMT && pMT->Validate())" in System.Text.RegularExpressions.Tests #129959

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@VincentBu
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Failed in: runtime-coreclr libraries-jitstress-random 20260627.1

Failed tests:

net11.0-linux-Release-arm-jitstress_random_1-(Debian.13.Arm32.Open)AzureLinux.3.Arm64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:debian-13-helix-arm32v7@sha256:7cd2e25705d98e003a2d4f2e10cbf27847f573d9548e06a72062028ed74f43a6
- System.Text.RegularExpressions.Tests Work Item

Error message:

ASSERT FAILED
	Expression: !CREATE_CHECK_STRING(pMT && pMT->Validate())
	Location:   /__w/1/s/src/coreclr/vm/object.cpp:548
	Function:   ValidateInner
	Process:    20
[createdump] Gathering state for process 20 dotnet
[createdump] Crashing thread 0037 signal 5 (0005)
[createdump] Writing crash report to file /datadisks/disk1/dumps/coredump.20.dmp.crashreport.json
[createdump] Crash report successfully written
[createdump] Writing minidump with heap to file /datadisks/disk1/dumps/coredump.20.dmp
[createdump] Written 1277902848 bytes (311988 pages) to core file
[createdump] Target process is alive
[createdump] Dump successfully written in 4407ms
waitpid() returned successfully (wstatus 00000000) WEXITSTATUS 0 WTERMSIG 0
/root/helix/work/workitem/e
./RunTests.sh: line 175:    20 Aborted                 (core dumped) "$RUNTIME_PATH/dotnet" exec --runtimeconfig System.Text.RegularExpressions.Tests.runtimeconfig.json --depsfile System.Text.RegularExpressions.Tests.deps.json xunit.console.dll System.Text.RegularExpressions.Tests.dll -xml testResults.xml -nologo -nocolor -notrait category=IgnoreForCI -notrait category=OuterLoop -notrait category=failing $RSP_FILE
----- end Sat Jun 27 06:51:13 PM UTC 2026 ----- exit code 134 ----------------------------------------------------------
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JitStressCLR JIT issues involving JIT internal stress modesCLR JIT issues involving JIT internal stress modesarea-CodeGen-coreclrCLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMICLR JIT compiler in src/coreclr/src/jit and related components such as SuperPMIblocking-clean-ci-optionalBlocking optional rolling runsBlocking optional rolling runs

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