Alexey Izbyshev <izbys...@ispras.ru> added the comment:

> out of curiosity, did you actually diagnose a process deadlocked due to this 
> or was it noted via code inspection?

The latter. I noted it while working on another issue. While it was easy to 
trigger a malloc() in child_exec() by e.g. specifying an invalid fd in pass_fds 
for Popen, I haven't tried to arrange a deadlock.

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<https://bugs.python.org/issue32777>
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