An extension module I use makes extensive use of the PyGILState API's in callback functions for C APIs. Some of the functions that use the PyGILState APIs are used in the tp_dealloc of methods. This seems cause problems when objects are cleaned up during interpreter shutdown: when an object is deallocated during PyInterpreterState_Clear I get a hard crash because the GILState machinery has been shut down at that time :-(
The bug report for this: http://bugs.python.org/issue1402The report includes a patch, but I know just enough about the python threading infrastructure to be dangerous and am not convinced that the patch is actually correct.
Ronald
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