New submission from Peter Parente:
Working on this PR (https://github.com/maxpoint/spylon/pull/49), I encountered
an unexpected SystemError in Python 3.6 on my Mac and on Travis Linux.
Exception in thread Thread-4:
Traceback (most recent call last):
File "/Users/parente/miniconda3/envs/spylon-dev/lib/python3.6/threading.py",
line 916, in _bootstrap_inner
self.run()
File "/Users/parente/miniconda3/envs/spylon-dev/lib/python3.6/threading.py",
line 864, in run
self._target(*self._args, **self._kwargs)
File "/Users/parente/projects/spylon/spylon/spark/progress.py", line 99, in
_spark_progress_thread_worker
td = datetime.datetime.now() - start_times[stage_id]
SystemError: <built-in method __missing__ of collections.defaultdict object at
0x106013098> returned NULL without setting an error
The exception only occurs in Python 3.6, not in Python 3.5 or 3.4:
https://travis-ci.org/maxpoint/spylon/builds/235992988
The defaultdict is both created and used as a local variable in a
threading.Thread run() function. It's never accessed outside that context
(https://github.com/maxpoint/spylon/pull/49/commits/2bd47dc32f6129f5f6a4824be1eaed568351df11#diff-1ba10d1cd92a35a380442cb586e310e2R179)
I didn't see a related issue on the tracker here nor did I see anything in the
3.6 changelog about a behavior change.
----------
messages: 294473
nosy: Peter Parente
priority: normal
severity: normal
status: open
title: defaultdict raises SystemError, __missing__ returned NULL in thread
type: crash
versions: Python 3.6
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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue30473>
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