STINNER Victor added the comment:
test_multiprocessing_spawn hangs on running test_child_fd_inflation(). Child
processes call test.support.fd_count(). But in a debug build, if the fd is
invalid, os.dup(fd) kills immediately the process without letting Python to
handle the error. It seems like os.dup(fd) raises a OSError(EBADF), as
expected, in release mode.
The test is new and currently only in master, see bpo-26732. The commit:
commit 896145d9d266ee2758cfcd7691238cbc1f9e1ab8
Author: Antoine Pitrou <pit...@free.fr>
Date: Sat Jul 22 13:22:54 2017 +0200
bpo-26732: fix too many fds in processes started with the "forkserver"
method (#2813)
* bpo-26732: fix too many fds in processes started with the "forkserver"
method
A child process would inherit as many fds as the number of still-running
children.
* Add blurb and test comment
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<http://bugs.python.org/issue31009>
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