New submission from William Grzybowski:
If a process is schedule to run in the event loop with debug disabled
and debug is then enabled before the process finishes it will result in
a traceback: debug_log undefined.
[2017/06/29 14:39:13] (ERROR) asyncio.default_exception_handler():1261 - Ta
sk exception was never retrieved
future: <Task finished coro=<kmod_load() done, defined at /usr/local/lib/py
thon3.6/site-packages/middlewared/plugins/vm.py:502> exception=UnboundLocal
Error("local variable 'debug_log' referenced before assignment",)>
Traceback (most recent call last):
File "/usr/local/lib/python3.6/site-packages/middlewared/plugins/vm.py",
line 503, in kmod_load
kldstat = (await (await Popen(['/sbin/kldstat'], stdout=subprocess.PIPE
)).communicate())[0].decode()
File "/usr/local/lib/python3.6/asyncio/subprocess.py", line 225, in creat
e_subprocess_exec
stderr=stderr, **kwds)
File "/usr/local/lib/python3.6/asyncio/base_events.py", line 1194, in sub
process_exec
logger.info('%s: %r', debug_log, transport)
----------
components: asyncio
messages: 297289
nosy: wg, yselivanov
priority: normal
pull_requests: 2549
severity: normal
status: open
title: asyncio: race condition with debug and subprocess
versions: Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30805>
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