[ci-scan] Hang: JIT/jit64/regress/vsw/539509/test1_539509 never exits after Passed on browser-wasm R2R-CG2

[lewing]

Build Information

Build: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1619748
Build error leg or test failing: run_test_p0_coreclr_R2R_CG2_browser_wasm_checked (R2R-CG2 browser wasm Checked no_tiered_compilation)-JIT/jit64/regress/vsw/539509/test1_539509/test1_539509.cmd
Pull request: #134618

KBE authoring guidance (ci-failure-scan)

• Error Details is for readers. Paste the full exception, stack trace, or build error excerpt so the failure is understandable without opening the raw log.
• Build Analysis parses only the single JSON block under Error Message.
• ErrorPattern uses .NET Singleline | IgnoreCase | NonBacktracking matching with a 50ms-per-line timeout.
• Keep the regex anchored, prefer [^\n]* over .*, and avoid catastrophic backtracking.
• Set BuildRetry to true only for a clear infrastructure retry case. ExcludeConsoleLog disables Helix console-log scanning.

The test crossgens and runs under node with corerun.js. It handles every expected exception and prints Passed., but the node process never exits. The out-of-process wrapper kills it after the 1800 s timeout, so the test fails even though its body passed. Helix work item jit64_5, job 6ca59463-8af3-4f89-bf8b-e15def16552f.

The PR build that hit this doesn't change crossgen2, the JIT, the VM, or corerun; its diff is limited to the browser WebAssembly SDK pack targets, boot-config tasks, and the browser loader. The test didn't fail in the main runtime build 1619318.

Error Details

Running: node --experimental-wasm-exnref --stack-size=8192 /root/helix/work/correlation/corerun.js -c /root/helix/work/correlation -p System.Reflection.Metadata.MetadataUpdater.IsSupported=false -p System.Runtime.Serialization.EnableUnsafeBinaryFormatterSerialization=true /root/helix/work/workitem/e/JIT/jit64/regress/vsw/539509/test1_539509/test1_539509.dll
Testing AA::Method1
Exception handled: System.InvalidCastException: Unable to cast object of type 'BB' to type 'AA`6[System.SByte,System.Byte,System.UInt32,System.UInt32,System.Int64,System.Boolean]'.
...
Testing BB::Method1
Exception handled: System.InvalidCastException: Unable to cast object of type 'AA`6[System.SByte,System.Byte,System.UInt32,System.UInt32,System.Int64,System.Boolean]' to type 'BB'.
   at BB.Method1(UInt32[,][][]& param1, String[][]& param2, Char[,]& param3, AA`6 param4, AA`6& param5, Int32 param6)
   at App.TestEntryPoint()
Passed.
Process 828 exceeded timeout of 1800 seconds. Killing...
../regress/vsw/539509/test1_539509/test1_539509.sh: line 488:   828 Killed                     "${cmd[@]}"
Kill watchdog with PID 829

Error Message

{
  "ErrorMessage": "",
  "ErrorPattern": "test1_539509\\.sh: line \\d+:\\s+\\d+ Killed",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Agentic workflow metadata (ci-failure-scan)

Workflow artifact: ci-failure-scan
Artifact kind: kbe-verification
Verified match count: 2 hits in failure.log

Note

This issue was drafted with GitHub Copilot.

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=1619748
Error message validated: [test1_539509\.sh: line \d+:\s+\d+ Killed]
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 10/1/2026 6:44:01 PM UTC

Report

Build	Repository	Test	Pull Request
1619945	dotnet/runtime	JIT/jit64/regress/vsw/539509/test1_539509/test1_539509.cmd
1619748	dotnet/runtime	JIT/jit64/regress/vsw/539509/test1_539509/test1_539509.cmd	#134618

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	2	2

[dotnet-policy-service]

Tagging subscribers to this area: @dotnet/runtime-infrastructure
See info in area-owners.md if you want to be subscribed.