[issue3666] atexit.register with bad input segfaults on exit

[Christian Heimes]

Christian Heimes <lists at cheimes.de> added the comment:

I was able to trace the error to its apartment. During the cleanup
gen_del calls PyErr_Fetch() which fails in PyThreadState_GET().

Conclusion:
The atexit cleanup method must be called much earlier.
call_ll_exitfunc() is too late. I suggest a new function that calls
atexit_cleanup() right after atexit_callfuncs().

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue3666>
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