GC Crash
Nobody has claimed this yet.
Assessment
- Difficulty
- 5/5
- Estimated time
- Over a week
- Newbie friendliness
- 15/100
- Issue type
- Bug
- Clarity
- Needs clarification
- Activity status
- Stale
- Tech stack
- csharp, ios
- Domain
- mobile-dev
Research direction
Start by investigating the GC crash path named in the stack trace, especially simple_par_nursery_serial_scan_object in sgen-scan-object.h and the callers in sgen-marksweep.c, sgen-gc.c, and sgen-thread-pool.c. Establish a reproducible net8-iOS case using MONO_GC_PARAMS=mode=pause:20; done means identifying and fixing the crash while confirming the app no longer fails under the reported configuration.
Written by the indexing model from the issue text.
Description
Description
I see several crashes in Sentry (net8-iOS app) related to GC.
GC settings: MONO_GC_PARAMS=mode=pause:20
StackTrace:
OS Version: iOS 18.5 (22F76)
Report Version: 104
Exception Type: EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: SEGV_NOOP at 0x0000000000000028
Crashed Thread: 9
Application Specific Information:
Exception 1, Code 1, Subcode 40 >
KERN_INVALID_ADDRESS at 0x28.
Thread 9 Crashed:
0 Gambino.IOS 0x20323c97c simple_par_nursery_serial_scan_object (sgen-scan-object.h:98)
1 Gambino.IOS 0x2032338c8 scan_card_table_for_block (sgen-marksweep.c:2601)
2 Gambino.IOS 0x20321afe8 major_scan_card_table (sgen-marksweep.c:2683)
3 Gambino.IOS 0x2032130f8 job_scan_major_card_table (sgen-gc.c:1497)
4 Gambino.IOS 0x2032436a4 thread_func (sgen-thread-pool.c:204)
5 libsystem_pthread.dylib 0x43550b340 _pthread_start
Reproduction Steps
no steps
Expected behavior
no crash
Actual behavior
app crashes
Regression?
no crashes in xamarin
Known Workarounds
no Workarounds
Configuration
MONO_GC_PARAMS=mode=pause:20
Other information
No response
- Dominant language
- C#
- Stars
- 18.3k
- Forks
- 5.6k
- PR merge metrics
- PR metrics pending
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
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