STINNER Victor added the comment:
The problem is that socketserver.ForkinMixin doesn't wait until all children
completes. It's only calls os.waitpid() in non-blocking module (using
os.WNOHANG) after each loop iteration. If a child process completes after the
last call to ForkingMixIn.collect_children(), the server leaks zombie processes.
The server must wait until all children completes. Attached PR implements that.
The bug was be reproduced with the attached forkingmixin_sleep.patch.
haypo@selma$ ./python -m test -v -u all test_socketserver --fail-env-changed -m
Warning -- reap_children() reaped child process 17093
Warning -- reap_children() reaped child process 17094
Added file: http://bugs.python.org/file47072/forkingmixin_sleep.patch
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