STINNER Victor <[email protected]> added the comment:
> It looks like test_multiprocessing_fork doesn't clean up some of its
> subprocesses and then test_subprocess hangs on waitpid(0) forever.
Oh strange. This issue was supposed to be fixed. I spent a lot of time to fix
such bug, but also make sure that not test leak any child process.
"test_subprocess hangs on waitpid(0) forever" I recall a similar bug that I
fixed recently.
I spent time on test.support.reap_children() and
test.support.threading_cleanup() to make sure that tests don't leak threads no
child processes. It seems like I missed some tests.
In Lib/test/libregrtest/runtest.py, I added:
def post_test_cleanup():
support.reap_children()
which is run after each test.
But currently, support.reap_children() calls os.waitpid(-1, os.WNOHANG) to
check for child processes which already completed. It doesn't warn if there are
child processes which are still running.
During my tests, I modified reap_children() to add a sleep(1).
Maybe on Linux we could use a cgroup to really check for all child processes?
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<https://bugs.python.org/issue31463>
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