[pypy-dev] Dead loop occurs when using python-daemon and multiprocessing together in PyPy 4.0.1

Maciej Fijalkowski fijall at gmail.com
Wed Dec 23 06:35:50 EST 2015


Hi hubo

Can you put it as a bug report? Those things get easily lost on the mailing
list (and sadly I won't look at it right now, multiprocessing scares me)

On Wed, Dec 23, 2015 at 12:03 PM, hubo <hubo at jiedaibao.com> wrote:

> Hello devs,
>
> A (possible) dead loop is found when I use python-daemon and
> multiprocessing together in PyPy 4.0.1, which does not appear in Python(2.6
> or 2.7). Also it does not appear in earlier PyPy versions (2.0.2)
>
> *Reproduce*:
>
> First install python-daemon:
> pypy_pip install python-daemon
>
> Use the following test script (also available in attachment):
>
> #!/usr/bin/pypy
> import daemon
> import multiprocessing
> def test():
>     q = multiprocessing.Queue(64)
> if __name__ == '__main__':
>     with daemon.DaemonContext():
>         test()
>
> When executing the script with pypy:
> pypy test.py
>
> The background service does not exit, and is consuming 100% CPU:
> ps aux | grep pypy
> root      7769 99.1  0.5 235332 46812 ?        R    17:52   2:09 pypy
> test.py
> root      7775  0.0  0.0 103252   804 pts/1    S+   17:54   0:00 grep pypy
>
>
>
> Executing the script with python:
> python2.7 test.py
> And the background service normally exits.
>
> *Environment:*
> I'm using CentOS 6.5, with portable PyPy distribution for linux (
> https://bitbucket.org/squeaky/portable-pypy/downloads/pypy-4.0.1-linux_x86_64-portable.tar.bz2
> )
> I run the script on system built-in python (python 2.6.6), a compiled
> CPython (2.7.11), and pypy from epel-release(pypy 2.0.2, python 2.7.2), and
> the problem does not appear. Though the compiled CPython is 2.7.11 and PyPy
> 4.0.4 is python 2.7.10, I think that does not matter much.
>
> Please contact if you have any questions or ideas.
>
>
> 2015-12-23
> ------------------------------
> hubo
>
> _______________________________________________
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> pypy-dev at python.org
> https://mail.python.org/mailman/listinfo/pypy-dev
>
>
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