Description
With the release of Traitlets 4.1 I am seeing some random seqfaults when restarting the Jupyter notebook and as part of the Matplotlib docs build which seems to point to the Traitlets tear down steps.
Im not sure this is related to Traitlets 4.1 but it does seem to correlate. Perhaps we are doing something wrong in Matplotlib which is causing this.
Locally:
Fatal Python error: PyImport_GetModuleDict: no module dictionary!
Thread 0x0000700001113000 (most recent call first):
File "/usr/local/lib/python3.5/site-packages/ipykernel/parentpoller.py", line 37 in run
File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 882 in _bootstrap
Thread 0x0000700000607000 (most recent call first):
File "/usr/local/lib/python3.5/site-packages/ipykernel/heartbeat.py", line 61 in run
File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 914 in _bootstrap_inner
File "/usr/local/Cellar/python3/3.5.1/Frameworks/Python.framework/Versions/3.5/lib/python3.5/threading.py", line 882 in _bootstrap
Current thread 0x00007fff7844b000 (most recent call first):
File "/usr/local/lib/python3.5/site-packages/traitlets/traitlets.py", line 1136 in on_trait_change
File "/usr/local/lib/python3.5/site-packages/IPython/core/extensions.py", line 64 in __del__
and in the Matplotlib docs build which uses the IPython Sphinx extension:
Error in atexit._
5E8E
run_exitfuncs:
Traceback (most recent call last):
File "/home/travis/build/matplotlib/matplotlib/venv/lib/python3.5/site-packages/IPython/core/history.py", line 547, in end_session
len(self.input_hist_parsed)-1, self.session_number))
sqlite3.OperationalError: disk I/O error
Fatal Python error: PyImport_GetModuleDict: no module dictionary!
Current thread 0x00007ff58684b700 (most recent call first):
File "/home/travis/build/matplotlib/matplotlib/venv/lib/python3.5/site-packages/traitlets/traitlets.py", line 1136 in on_trait_change
File "/home/travis/build/matplotlib/matplotlib/venv/lib/python3.5/site-packages/IPython/core/extensions.py", line 64 in __del__
Aborted (core dumped)
The sql error is old and fixed already in IPython master see ipython/ipython#8850