65ec6ba6e7
A dynamically linked program invokes the rtld cleanup routine via an atexit handler. This rtld cleanup routine invokes _fini() for shared libraries, which in-turn invoke __cxa_finalize() with their DSO handle. By luck, this happens to work okay for non-threaded programs, but for a threaded program, this leads to deadlock (sometimes manifested as an assertion failure, if the program didn't actually create any threads). Fixed by teaching __cxa_finalize() that it can be recursively invoked, adjusting the handler list manipulation accordingly.