Ned Deily <n...@python.org> added the comment: I also have seen test_subprocess hangs on both macOS and on Debian Linux on both 3.6 and master, as recently as 3.6.3 and 3.7.0a1 but not with current heads. After some experimenting and bisecting, I tracked the fix down to the mock os.waitpid fixes for bpo-31178 (git11045c9d8a and gitfae0512e58). So perhaps this issue can be closed.
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