I've come across a problem whilst trying to run the twisted test suite, where some tests just cause python to segfault. It seems to be the same issue with libcrypto as reported in [2],[3]
A small test case is attached to [2] as cygwin_crash.zip, referred to in msg76086, which shows that manipulating a semaphore in DllMain(DLL_THREAD_DETACH) causes a crash. There is a patch for openssl attached to [1] which makes sense to me. Surely the cleanup ERR_remove_state() does should be requested using pthread_cleanup_push() rather using DllMain(DLL_THREAD_DETACH)? But that doesn't seem to be done for any other POSIX target. The documentation of ERR_remove_state() gives me the impression that it expects the application to arrange for that to happen, so perhaps it's just trying too hard to be helpful here? I suppose the alternative interpretation is that you are supposed to be able to call anything you like from DllMain(DLL_THREAD_DETACH), then this is a cygwin bug. But I can't see how that could be made work as pthread::exit() has to delete the cygwin thread object before ExitThread() is called, as there's no thread to do it in afterwards :-) [1] http://www.mail-archive.com/openssl-dev@openssl.org/msg24599.html [2] http://bugs.python.org/issue3947 [3] http://cygwin.com/ml/cygwin/2008-11/msg00341.html -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple
