[mono] Assertion at jit-info.c:918, condition '!ji->async'

[vitek-karas]

Build Information

Build: 20251105.5, 20251105.1, 20251104.5

Build error leg or test failing: Loader.WorkItemExecution, the specific test failing is ExtendedLayoutTests.ExtendedLayout.ExtendedLayout_NoExtendedLayoutAttribute

Affected CI jobs: linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT_RuntimeTests

Commit range: started to fail on 10/14 2025, but there's a large hole in data before that date, so it's possible it was earlier.

Summary

• Native crash triggered by SIGABRT from Mono runtime assertion failure during test execution
• Failures occur on linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT_RuntimeTests job on linux x64 platform
• AOT-only mode fails to load 'ExtendedLayout.dll.so', causing runtime errors in mono/metadata/jit-info.c
• Mono runtime assertion at line 918 fails with condition '!ji->async' not met during test
• Tests exit with code 0 instead of expected 100, resulting in test failure with exit code 1

Work Items

Work Item	Job Name	Build	Console Log
Loader	linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT_RuntimeTests	20251105.5	View Extract ================================================================= Native Crash Reporting ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= ... 03:02:15.733 Running test: _ExtendedLayout::ExtendedLayoutTests.ExtendedLayout.ExtendedLayout_NoExtendedLayoutAttribute() Failed to load AOT module '/datadisks/disk1/work/A14E093D/w/97AB0850/e/Loader/Loader/ExtendedLayout.dll.so' ('/datadisks/disk1/work/A14E093D/w/97AB0850/e/Loader/Loader/ExtendedLayout.dll') in aot-only mode. ================================================================= Native Crash Reporting ================================================================= ... ================================================================= Managed Stacktrace: ================================================================= at <unknown> <0xffffffff> * Assertion at /__w/1/s/src/mono/mono/metadata/jit-info.c:918, condition `!ji->async' not met App Exit Code: 0 Expected: 100 Actual: 0 END EXECUTION - FAILED + test_exit_code=1 Full Log
Loader	linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT_RuntimeTests	20251105.1	View Extract ================================================================= Native Crash Reporting ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= 14:54:10.861 Running test: _ExtendedLayout::ExtendedLayoutTests.ExtendedLayout.ExtendedLayout_NoExtendedLayoutAttribute() Failed to load AOT module '/datadisks/disk1/work/A4560917/w/A41B08D0/e/Loader/Loader/ExtendedLayout.dll.so' ('/datadisks/disk1/work/A4560917/w/A41B08D0/e/Loader/Loader/ExtendedLayout.dll') in aot-only mode. ================================================================= Managed Stacktrace: ================================================================= at <unknown> <0xffffffff> * Assertion at /__w/1/s/src/mono/mono/metadata/jit-info.c:918, condition `!ji->async' not met App Exit Code: 0 Expected: 100 Actual: 0 END EXECUTION - FAILED + test_exit_code=1 Full Log
Loader	linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT_RuntimeTests	20251104.5	View Extract ================================================================= Native Crash Reporting ================================================================= Got a SIGABRT while executing native code. This usually indicates a fatal error in the mono runtime or one of the native libraries used by your application. ================================================================= ================================================================= Native stacktrace: ... 02:55:15.378 Running test: _ExtendedLayout::ExtendedLayoutTests.ExtendedLayout.ExtendedLayout_NoExtendedLayoutAttribute() Failed to load AOT module '/datadisks/disk1/work/AEE109AB/w/B2FB09E9/e/Loader/Loader/ExtendedLayout.dll.so' ('/datadisks/disk1/work/AEE109AB/w/B2FB09E9/e/Loader/Loader/ExtendedLayout.dll') in aot-only mode. ================================================================= Native Crash Reporting ================================================================= ... ================================================================= Managed Stacktrace: ================================================================= at <unknown> <0xffffffff> * Assertion at /__w/1/s/src/mono/mono/metadata/jit-info.c:918, condition `!ji->async' not met App Exit Code: 0 Expected: 100 Actual: 0 END EXECUTION - FAILED + test_exit_code=1 Full Log

Error Message

{
  "ErrorMessage": [
    "Failed to load AOT module",
    "* Assertion at /__w/1/s/src/mono/mono/metadata/jit-info.c:918, condition \u0060!ji-\u003Easync\u0027 not met"
  ],
  "ErrorPattern": "",
  "BuildRetry": false,
  "ExcludeConsoleLog": false
}

Notes

The test only fails on the linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT configuration, it passes in all other configs.

Report

Build	Definition	Test	Pull Request
1196167	dotnet/runtime	Loader.WorkItemExecution

Summary

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

Report

Build	Definition	Test	Pull Request
1204837	dotnet/runtime	Loader.WorkItemExecution
1204656	dotnet/runtime	Loader.WorkItemExecution
1204467	dotnet/runtime	Loader.WorkItemExecution
1204288	dotnet/runtime	Loader.WorkItemExecution
1203861	dotnet/runtime	Loader.WorkItemExecution
1203101	dotnet/runtime	Loader.WorkItemExecution
1202589	dotnet/runtime	Loader.WorkItemExecution
1201762	dotnet/runtime	Loader.WorkItemExecution
1201228	dotnet/runtime	Loader.WorkItemExecution
1200686	dotnet/runtime	Loader.WorkItemExecution
1200207	dotnet/runtime	Loader.WorkItemExecution
1199607	dotnet/runtime	Loader.WorkItemExecution
1199144	dotnet/runtime	Loader.WorkItemExecution
1198606	dotnet/runtime	Loader.WorkItemExecution	#121488
1198528	dotnet/runtime	Loader.WorkItemExecution
1198197	dotnet/runtime	Loader.WorkItemExecution

Summary

24-Hour Hit Count	7-Day Hit Count	1-Month Count
0	0	16

[vitek-karas]

This is likely related to #119948 (maybe even a duplicate)
There's a second issue that this test should be disabled for mono:

runtime/src/tests/Loader/classloader/ExtendedLayout/ExtendedLayout.csproj

Line 6 in 6e1e6b1

<MonoAotIncompatible>true</MonoAotIncompatible>

But it still runs in the linux_x64_Release_AllSubsets_Mono_LLVMFULLAOT configuration (note that it currently doesn't run on any other configuration in extra-platforms).

[luronumen]

I started noticing some intermittent crashes in my Android application, and after analyzing the log, the reason is exactly as mentioned in the description of this issue.

Assertion at /__w/1/s/src/runtime/src/mono/mono/metadata/jit-info.c:918, condition `!ji->async' not met

8049 8336 F libc : Fatal signal 6 (SIGABRT), code -1 (SI_QUEUE) in tid 8336 (Finalizer), pid 8049 (mydomain.myapp)

I added <MonoAotIncompatible>true</MonoAotIncompatible> to my csproj and now I will observe if the issue happens again.
I will keep you informed about this.

[rburnashev85]

I also see many Assertion at /__w/1/s/src/runtime/src/mono/mono/metadata/jit-info.c:918, condition `!ji->async' not met after I released my app on NET10 with all nugets updated to latest versions. Before NET9 worked with no issues.

@luronumen were you able to solve the issue?

what if to add UseInterpreter true ?

[luronumen]

Hi @rburnashev85 ,

Because this is an intermittent issue, we will only be able to confirm that the <MonoAotIncompatible>true</MonoAotIncompatible> workaround worked within a few days.