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Created attachment 7846 [details]
Log of internal test job that crashes
Built from branch 18.104.22.168.
Looks like the crash is in Thread 13 around sgen-gc.h:767 which is in sgen_par_object_get_size(...) and reads:
mword descr = (mword)vtable->gc_descr;
Possibly a null pointer dereference?
I've tried to build a minimal testcase, but I can only trigger this crash very rarely. Trying again with reduced nursery size, but any additional pointers would be most appreciated.
It should also be noted that we're using the MathNET.Numerics MKL native provider, as you can see in the logs. It's possible that might have something to do with the problem... though based on the stacktrace I can't see how.
Could you test this with mono master? We fixed a GC bug there recently.
If the bug still persists with master, please provide a test case.
Can you still reproduce with latest version of mono? If you can, please reopen and provide a repro case. Thank you