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stackoverflowtester Exit code: 0x0000008B, expected 0x00000086 #126502
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I thought it's that one too. But not a timeout.
failure analysis:
Issue #126502 — Complete Diagnosis Immediate Cause: Missing Architecture.Arm in test skip In stackoverflowtester.cs, the main thread largeframe test (line 126) skips for Arm64|X64|RiscV64|LoongArch64 on Unix but omits ARM32. The secondary thread version (line 202) correctly includes Architecture.Arm. Why SIGSEGV instead of SIGABRT - Largeframe methods allocate 65,536 bytes per frame via nested LargeStruct65536 - ARM32 JIT probes stack pages without moving SP - Guard page fault address is >8KB from SP → runtime's 2-page detection window in signal.cpp:679 misses it - SIGSEGV (exit 139) instead of expected SIGABRT (exit 134) Fix Add Architecture.Arm to line 126-127, matching the secondary thread version at line 201-202. Related - #110173 — Main tracker (assigned @janvorli), 8+ ARM32 hits in recent months - #107184 — ARM32 EHABI unwind limitations - #13519 — Stack probing doesn't move SP - Not a regression — pre-existing ARM32 limitation with inconsistent skip- linked a pull request that will close this issueFix stackoverflowtester to skip ARM32 in TestStackOverflowLargeFrameMainThread #126525
on Apr 3, 2026 Failed in: runtime-coreclr outerloop 20260407.4
Failed tests:
coreclr linux arm Checked no_tiered_compilation @ (Alpine.323.Arm32.Open)AzureLinux.3.Arm64.Open@mcr.microsoft.com/dotnet-buildtools/prereqs:alpine-3.23-helix-arm32v7 - baseservices/exceptions/stackoverflow/stackoverflowtester/stackoverflowtester.cmdError message:
Return code: 1 Raw output file: /root/helix/work/workitem/uploads/stackoverflow/stackoverflowtester/output.txt Raw output: BEGIN EXECUTION /root/helix/work/correlation/corerun -p System.Reflection.Metadata.MetadataUpdater.IsSupported=false -p System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true stackoverflowtester.dll '' Running stackoverflow test(smallframe main) "Stack overflow." "Repeated 174556 times:" "--------------------------------" " at TestStackOverflow.Program.InfiniteRecursionC()" " at TestStackOverflow.Program.InfiniteRecursionB()" " at TestStackOverflow.Program.InfiniteRecursionA()" "--------------------------------" " at TestStackOverflow.Program.Test(Boolean)" " at TestStackOverflow.Program.Main(System.String[])" "@Exiting stack trace printing thread." "@Stack trace printing helper thread exited." "@Proceeding with exit." "@Setting throwable." "@Calling WatsonLastChance." "@Terminating the process." "" Running stackoverflow test(largeframe main) "Stack overflow." "Repeated 42 times:" "--------------------------------" " at TestStackOverflow.Program.InfiniteRecursionB2()" " at TestStackOverflow.Program.InfiniteRecursionA2()" " at TestStackOverflow.Program.InfiniteRecursionC2()" "--------------------------------" " at TestStackOverflow.Program.InfiniteRecursionB2()" " at TestStackOverflow.Program.InfiniteRecursionA2()" " at TestStackOverflow.Program.Test(Boolean)" " at TestStackOverflow.Program.Main(System.String[])" "@Exiting stack trace printing thread." "" System.Exception: Exit code: 0x0000008B, expected 0x00000086 at TestStackOverflow.Program.TestStackOverflow(String testName, String testArgs, List`1& stderrLines) at TestStackOverflow.Program.TestStackOverflowLargeFrameMainThread() at __GeneratedMainWrapper.Main() Expected: 100 Actual: 101 END EXECUTION - FAILED Test Harness Exitcode is : 1 To run the test: Set up CORE_ROOT and run. > /root/helix/work/workitem/e/baseservices/exceptions/baseservices-exceptions/../stackoverflow/stackoverflowtester/stackoverflowtester.shStack trace:
at Xunit.Assert.True(Nullable`1 condition, String userMessage) in /_/src/arcade/src/Microsoft.DotNet.XUnitAssert/src/BooleanAsserts.cs:line 135 at Program.<<Main>$>g__TestExecutor158|0_159(StreamWriter tempLogSw, StreamWriter statsCsvSw, <>c__DisplayClass0_0&)- locked and limited conversation to collaborators
on May 14, 2026
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Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=1365267
Build error leg or test failing: baseservices/exceptions/stackoverflow/stackoverflowtester/stackoverflowtester.cmd
Pull request: #126498
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Fill the error message using step by step known issues guidance.
{ "ErrorMessage": ["Running stackoverflow test(smallframe main)", "Exit code: 0x0000008B, expected 0x00000086"], "ErrorPattern": "", "BuildRetry": false, "ExcludeConsoleLog": false }Known issue validation
Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1365267
Error message validated:
[Running stackoverflow test(smallframe main) Exit code: 0x0000008B, expected 0x00000086]Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 4/3/2026 1:07:40 PM UTC
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