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Regression introduced with 2.11.0: The failure paths in socket, socketpair and accept4 functions and methods accidentally release *unused* cygheap_fdmanip objects. The subsequently called dtable::release method was designed to be called for *used* cygheap_fdmanip objects only. Using them on unused objects leads to NULL pointer member dereferencing. Worse, the inet/local accept4 methods only release the cygheap_fdmanip object but neglect to delete the just created fhandler_socket_* object. Fix this by removing the erroneous release calls in the aforementioned failure paths and delete the fhandler_socket_* object in accept4 instead. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>