Non-recursive mutex. second lock call failed ! Mutex not locked by calling thread: mutex 0x........, recursion count 0, owner 1. at 0x........: pthread_mutex_unlock (drd_pthread_intercepts.c:?) by 0x........: lock_twice (recursive_mutex.c:?) by 0x........: main (recursive_mutex.c:?) mutex 0x........ was first observed at: at 0x........: pthread_mutex_trylock (drd_pthread_intercepts.c:?) by 0x........: lock_twice (recursive_mutex.c:?) by 0x........: main (recursive_mutex.c:?) Done. ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)