#31509: Enable faulthandler automatically during tests
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Reporter: Adam (Chainz) | Owner: Omkar
Johnson | Kulkarni
Type: New feature | Status: assigned
Component: Testing framework | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 0 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 0
Easy pickings: 1 | UI/UX: 0
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Comment (by Omkar Kulkarni):
I was playing around with this locally, and the faulthandler properly
outputs a traceback when running tests serially, but I ran into some
issues when trying to test in parallel. I manually sent signals like
SIGABRT or SIGSEGV to the multiprocessing PID, which caused the tests to
loop forever (without outputting the faulthandler traceback). I believe
this is because I am using python3.8 on macOS, which has changed the
default start method for the multiprocessing module from 'fork' to 'spawn'
(see https://docs.python.org/3/library/multiprocessing.html#contexts-and-
start-methods). When I switched to python3.7, then the faulthandler will
work for subprocesses as well (since child processes inherit signal
handlers), but it still results in an infinite loop. I am pushing a commit
that just enables fault handlers, but the issue of the infinite loop will
persist since Python multiprocessing doesn't expose an API to see if the
child is has been killed (i.e. handling SIGCHLD).
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Ticket URL: <https://code.djangoproject.com/ticket/31509#comment:5>
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