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We get a report from a person who installed our product from repeated crashes with Mono 126.96.36.199. The crash persistently happens in drain_gray_stack function only on his mac. Right now the only information we have is a following stacktrace:
0 libmonosgen-2.0.1.dylib 0x0000000103e7fe41 mono_handle_native_crash + 257
1 libmonosgen-2.0.1.dylib 0x0000000103dd2e58 mono_sigsegv_signal_handler + 184
2 libsystem_platform.dylib 0x00007fffaea7fb3a _sigtramp + 26
3 ??? 0x00000000050ae8d0 0x0 + 84601040
4 libmonosgen-2.0.1.dylib 0x0000000104029988 drain_gray_stack + 7192
5 libmonosgen-2.0.1.dylib 0x000000010404fa81 marker_idle_func + 433
6 libmonosgen-2.0.1.dylib 0x000000010404e84c thread_func + 460
7 libsystem_pthread.dylib 0x00007fffaea8993b _pthread_body + 180
8 libsystem_pthread.dylib 0x00007fffaea89887 _pthread_body + 0
9 libsystem_pthread.dylib 0x00007fffaea8908d thread_start + 13
Created attachment 25329 [details]
Mono console output for the new crash in GC
Here is a new crash from the same machine. The application was running in environment with MONO_LOG_LEVEL=debug MONO_LOG_MASK=gc. This time GC crashes in marker_idle_func.
Here the last lines from Mono GC log (for the full log please see the attachment):
Mono: GC_MINOR: (Nursery full) time 5.84ms, stw 7.48ms promoted 97K major size: 203648K in use: 196717K los size: 66444K in use: 59825K
Mono: GC_MINOR: (Concurrent start) time 3.22ms, stw 13.10ms promoted 17K major size: 203648K in use: 196735K los size: 66444K in use: 59825K
Mono: GC_MAJOR_CONCURRENT_START: (LOS overflow)
Mono: GC_MINOR: (Nursery full) time 4.18ms, stw 7.78ms promoted 107K major size: 203776K in use: 196854K los size: 66444K in use: 59930K
Mono: GC_MINOR: (Nursery full) time 4.19ms, stw 6.55ms promoted 96K major size: 203872K in use: 196958K los size: 66444K in use: 59962K
Mono: GC_MINOR: (Nursery full) time 4.72ms, stw 9.17ms promoted 99K major size: 203984K in use: 197065K los size: 66444K in use: 59994K
As you can see there is an unfinished major heap collection.
Thank you for the report. I'm afraid there is nothing that can be done about these type of crashes without a repro test case. Let me know if any progress is made on that.
Please provide information requested in previous comment to reopen. Thank you.