Intermittent crash in libdispatch.dylib on first command after some time

[adamcath]

1. Mount awsfs
2. Leave it running for a while (not sure how long. Maybe putting computer to sleep and coming back repro's it?)
3. Do anything non-trivial in awsfs (e.g. ls ~/aws/ec2/us-west-2).

Result: crash (report)

[adamcath]

Here's a clue: http://blog.yimingliu.com/2015/07/22/python-multiprocessing-code-crashes-on-os-x-under-ipython/

[adamcath]

A better clue: https://bugs.python.org/issue20585

[adamcath]

Trying to figure out how to debug python from a core dump: http://stackoverflow.com/questions/18978455/python-debugging-with-gdb-on-osx