Hi.

Recently, we started getting "Fatal Python error: Cannot recover from
stack overflow." in the Python 3 tests (when running setup.py test),
which is immediately followed by "Abort trap: 6", which kills Python.
In Mac OS X, this generates a problem report automatically with
logging information.  I've uploaded the test output and the logging
info at https://gist.github.com/2317869.  This has shown up in at
least two other people's SymPy-Bot tests (see
https://github.com/sympy/sympy/pull/1208), so I'm pretty sure it's not
a problem on my end.

Does anyone have any idea what could be causing this?  I don't see how
it could be anything but a Python bug.  I'm currently in the process
of bisecting the history to find the offending commit.  It's taking a
while, though, as I have to rerun ./bin/use2to3 and setup.py test to
reproduce it (just running ./bin/test on the failing test file does
not reproduce the error).  I'll report back when I get it.

Aaron Meurer

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