segfault at exit when an exception exited stage_version context #250
Description
$ cat repro.py
import datetime
import h5py
import numpy
from versioned_hdf5 import VersionedHDF5File
import some_deshaw_module
def f():
path_to_write = '/tmp/foo.h5'
timestamp = numpy.datetime64(datetime.datetime.utcnow())
f = h5py.File(path_to_write, 'w')
vf = VersionedHDF5File(f)
with vf.stage_version('v1', timestamp=timestamp) as sv:
sv.create_dataset('foo', data=numpy.arange(10))
with vf.stage_version('v2', timestamp=timestamp) as sv:
1/0
f()
$ ipython repro.py
ZeroDivisionError: division by zero
zsh: segmentation fault (core dumped)
If I remove the 'import some_deshaw_module' or use python instead of ipython, then it doesn't reproduce the segfault.
I suspect whether the segfault happens depends on specifics of memory layout, so even if we get a reproducer without some_deshaw_module it might still not segfault on a different computer. I've seen similar cases where even the length of the contents of $PATH affected whether code segfaulted.
Before we do more work on making a more self-contained reproducer, are you able to see what the problem could be based on inspecting the code?