I encountered the same issue with Python 3.4 on CentOS 7 when using only the
close_fds argument. Since I am passing a lot of dynamically obtained file
descriptors, using the pass_fds argument is impossible for my case. Setting
close_fds to False *but* also explicitly making the fds inheritable upon
generation solved the issue. I would be really grateful if there was at least a
note in the subprocess module explaining that one might need to explicitly make
file descriptors inheritable since if it wasn't this post I would have lost
even more time than I already did.
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