[3.7] bpo-34658: Fix rare subprocess prexec_fn fork error. (GH-9255) by miss-islington · Pull Request #9256 · python/cpython
bpo-34658: Fix a rare interpreter unhandled exception state SystemError only
seen when using subprocess with a preexec_fn while an after_parent handler has
been registered with os.register_at_fork and the fork system call fails.
https://bugs.python.org/issue34658
(cherry picked from commit a20b6ad)
Co-authored-by: Gregory P. Smith greg@krypto.org