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)