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Changes between Initial Version and Version 1 of Ticket #31509

initial	v1
1		Sometimes when testing one discovers a "hang". This can be hard to diagnose since default test output just includes dots, so one can't tell which test has hung. Also hangs can be random, so hard to diagnose.
	1	Sometimes when testing one discovers a "hang," segfault, or other issue. This can be hard to diagnose since default test output just includes dots, so one can't tell which test has hung. Also hangs can be random, so hard to diagnose.
2	2
3	3	In such cases, [https://docs.python.org/3/library/faulthandler.html faulthandler] is useful to enable, as killing the process will output a stack trace for each thread.