New submission from Mark Gius:
When subprocess.Popen is called with subprocess.PIPE and os.fork() fails (due
to insufficient memory for example), the pipes created by _get_handles() are
not closed.
Steps to reproduce:
1) Launch a python shell, import subprocess
2) Create a situation where os.fork() will fail (I ran a program to eat up
nearly all of the memory on a system)
3) subprocess.Popen('/bin/echo', stdin=subprocess.PIPE)
4) OSError(12, 'Cannot allocate memory')
5) ls /proc/$pid/fd , There are now extra pipes.
I tested on Ubuntu 11.10 python (2.7.2-5ubuntu1). My reading of the 2.7 and
3.3 development trees suggest that this is an issue with both of those
branches, but I don't have a 3.3 installation to confirm with.
I've attached a snippet that fixes it for my version of Python on Ubuntu. No
idea what ramifications it will have for other versions/OS/etc. No automated
testing included because I'm not entirely sure how to replicate this without
eating up a ton of ram or doing something naughty with ulimit.
----------
components: Library (Lib)
files: fd_leak_fix.diff
keywords: patch
messages: 173804
nosy: Mark.Gius
priority: normal
severity: normal
status: open
title: subprocess.Popen leaks file descriptors on os.fork() failure
type: resource usage
versions: Python 2.7
Added file: http://bugs.python.org/file27719/fd_leak_fix.diff
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<http://bugs.python.org/issue16327>
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