Segmentation fault with PG-12

In our production-environment we get sig11 every now and then after upgrading to PG-12:

 

2019-10-08 15:45:29.654 CEST [8829-76] LOG:  server process (PID 20631) was terminated by signal 11: Segmentation fault
2019-10-08 15:45:29.654 CEST [8829-77] DETAIL:  Failed process was running: COMMIT
2019-10-08 15:45:29.654 CEST [8829-78] LOG:  terminating any other active server processes
 

Will running a debug-enabled build slow things noticably down?

Is there a way to make it dump a stack-trace (or back-trace in C-land?) on sig11?