AF: m_alignpad == 0 (LibraryImportGenerator.Unit.Tests)

[jkotas]

/private/tmp/helix/working/BC7909DB/w/AAF70995/e /private/tmp/helix/working/BC7909DB/w/AAF70995/e
  Discovering: LibraryImportGenerator.Unit.Tests (method display = ClassAndMethod, method display options = None)
  Discovered:  LibraryImportGenerator.Unit.Tests (found 184 of 189 test cases)
  Starting:    LibraryImportGenerator.Unit.Tests (parallel test collections = on, max threads = 12)

Assert failure(PID 48010 [0x0000bb8a], Thread: 3605062 [0x370246]): m_alignpad == 0
    File: /Users/runner/work/1/s/src/coreclr/vm/syncblk.cpp Line: 2958
    Image: /private/tmp/helix/working/BC7909DB/p/dotnet

Build Information

Build: https://dev.azure.com/dnceng-public/cbb18261-c48f-4abb-8651-8cdcb5474649/_build/results?buildId=395229
Build error leg or test failing: LibraryImportGenerator.Unit.Tests.WorkItemExecution
Pull request: #91415

Error Message

Fill the error message using step by step known issues guidance.

{
  "ErrorMessage": "m_alignpad == 0",
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Known issue validation

Build: 🔎 https://dev.azure.com/dnceng-public/public/_build/results?buildId=395229
Error message validated: m_alignpad == 0
Result validation: ✅ Known issue matched with the provided build.
Validation performed at: 9/5/2023 2:07:19 AM UTC

Report

Summary

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

[mangod9]

Looks to be a failure on macOS x64, Unfortunately CI doesnt capture dumps, so will have to wait to see if this is occurring frequently.

[kunalspathak]

Looks to be a failure on macOS x64, Unfortunately CI doesnt capture dumps, so will have to wait to see if this is occurring frequently.

This is happening more frequently lately on windows/linux as well. E.g. From this PR run. Logs are: https://helixre8s23ayyeko0k025g8.blob.core.windows.net/dotnet-runtime-refs-pull-93223-merge-ccfaccd8a68c41f488/HardwareIntrinsics_Arm_ro/1/console.6dd29e5c.log?helixlogtype=result in

Can you please prioritize because this is blocking clean ci runs?

[kunalspathak]

0:000> ?? this
class ObjHeader * 0x0000020d`f053cdf8
   +0x000 m_alignpad       : 0x6bab9f70
   +0x004 m_SyncBlockValue : Volatile<unsigned long>

00 KERNELBASE!RaiseFailFastException
01 coreclr!FailFastOnAssert
02 coreclr!_DbgBreakCheck
03 coreclr!_DbgBreakCheckNoThrow
04 coreclr!DbgAssertDialog
05 coreclr!ObjHeader::IllegalAlignPad
06 coreclr!ObjHeader::GetBits
07 coreclr!ObjHeader::Validate
08 coreclr!Object::ValidateInner
09 coreclr!Object::Validate
0a coreclr!OBJECTREF::OBJECTREF
0b coreclr!ObjectFromHandle
0c coreclr!MarshalNative::GCHandleInternalGet

[jeffschwMSFT]

removing blocking-clean-ci as it has not failed in 30 days

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

[jkotas]

m_alignpad == 0

This is a general symptom of a GC hole or a GC heap corruption that can have many different root causes. It is likely that the specific root cause has been fixed.

If we see this AF again in future, do not re-activate this issue, open a new issue instead.