Antoine Pitrou <pit...@free.fr> added the comment:

I don't think asking Python extensions to be safe in the face of brutal DLL 
unloading is wise. I don't think any of our C extensions tries to respect such 
an use case. We could still try to support the use case of some application 
registering its own callbacks before importing _ssl.

As for the patch, it looks wrong since CRYPTO_get_locking_callback() is 
compared to NULL a second time after the callback has been set to something 
non-NULL.

----------
nosy: +pitrou
priority:  -> normal
title: _ssl module causes segfault -> _ssl module overwrites existing thread 
safety callbacks
versions: +Python 2.7, Python 3.1, Python 3.2

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue7672>
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