http://bugs.winehq.org/show_bug.cgi?id=6941
--- Comment #16 from Dmitry Timoshkov dmitry@baikal.ru --- (In reply to comment #15)
I have seen this problem before. Thread 1 is waiting in recvfrom while Thread 2 closes the socket. Thread 1 never resumes recvfrom and hangs forever.
It's probbaly one of the bugs fixed by c09c82b25a3c95e79f23f22571fe9a63b38b824c.