Re: [uclibc-ng-devel] nptl pthread_cond_wait() issue on x86_64

Hi, I'm hitting an issue with the assembler implementation of pthread_cond_wait() that is used on x86_64 with nptl. If a thread is canceled while waiting in pthread_cond_wait(), the condvar seems be left in an inconsistent state. A different thread first calling pthread_cond_signal()t then gets blocked in pthread_cond_destroy(). It seems that the function falsely assumes that there are other waiters in the condvar. The test program below reproduces the issue, blocking in pthread_cond_destroy(). Switching to the C implementation on x86_64 fixes the problem here. A trivial fix would just switch back to the C implementation, basically revert e928e223fd. That commit, however, states that the generic implementations are broken on x86_64. I couldn't reproduce that, though. Has anybody else seen pthread_cond_wait() issues on x86_64?