Notice (2018-05-24): bugzilla.xamarin.com is now in
Please join us on
Visual Studio Developer Community and in the
Mono organizations on
GitHub to continue tracking issues. Bugzilla will remain
available for reference in read-only mode. We will continue to work
on open Bugzilla bugs, copy them to the new locations
as needed for follow-up, and add the new items under Related
Our sincere thanks to everyone who has contributed on this bug
tracker over the years. Thanks also for your understanding as we
make these adjustments and improvements for the future.
Please create a new report on
GitHub or Developer Community with
your current version information, steps to reproduce, and relevant error
messages or log files if you are hitting an issue that looks similar to
this resolved bug and you do not yet see a matching new report.
Created attachment 7846 [details]
Log of internal test job that crashes
Built from branch 22.214.171.124.
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