New submission from Martin Ritter <mce.rit...@gmail.com>:
Hi,
I tried to use
subprocess.run(..., stdout=subprocess.PIPE, timeout=N)
to run some test scripts with a given timeout.
This works as expected with simple scripts. However if the script itself
creates other children which write to stdout then `subprocess.run()` seems to
wait for all of the children to finish. I've attached a minimal example.
I looked into subprocess.py and `subprocess.run()` calls
`process.communicate()` again without timeout when handling the TimeoutExpired
exception which then in turn waits for the pipes to be closed by all children.
If communicate() would check if the process is still alive while waiting for
output and close the pipes once the process has finished the timeout feature
should work as expected and descendants would get a SIGPIPE when writing to
stdout/stderr.
----------
components: Library (Lib)
files: test_killsub.py
messages: 305487
nosy: Martin Ritter
priority: normal
severity: normal
status: open
title: subprocess.run() timeout not working with grandchildren and stdout=PIPE
type: behavior
versions: Python 3.6
Added file: https://bugs.python.org/file47251/test_killsub.py
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Python tracker <rep...@bugs.python.org>
<https://bugs.python.org/issue31935>
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