I have come across a very similar problem in my testing and would suggest running your code with strace option to log it to a file. strace shows you all of the system calls your code is making, which is really useful for debugging.

For example, if your entry point is 'main.py' then you would run

    strace -o logfile python main.py

which would log it to a local file 'logfile'. You can also run it without the '-o' switch if you would like to see the output on stderr.

Sadly, I have not solved my own issues. Have either you or the other gentleman figured out what was causing the issue?