STINNER Victor <victor.stin...@gmail.com> added the comment: A colleague packaging Python for Red Hat Entreprise Linux reported me that tests hang randomly on test_exception_errpipe_bad_data() of test_subprocess. I don't know why exactly, but using strace, I noticed that the "unit test" calls os.waitpid() with the pid returned by the mocked fork_exec(): pid 0. So the test calls os.waitpid(0, 0).
In a REPL on my Fedora 26, os.waitpid(0, 0) raises "ChildProcessError: [Errno 10] No child processes". I'm not sure that waitpid() is the cause of the hang, but it doesn't seem correct to me to call waitpid() with the result of a mock function, since the mock doesn't create a real child process. Attached PR 3896 mocks also os.waitpid() to fix this bug. I reopen the issue to discuss this bug in the new test added in this issue. ---------- resolution: fixed -> status: closed -> open _______________________________________ Python tracker <rep...@bugs.python.org> <https://bugs.python.org/issue31178> _______________________________________ _______________________________________________ Python-bugs-list mailing list Unsubscribe: https://mail.python.org/mailman/options/python-bugs-list/archive%40mail-archive.com
