Reader-writer lock not locked by calling thread: rwlock 0x.........
   at 0x........: pthread_rwlock_unlock (drd_pthread_intercepts.c:?)
   by 0x........: safe_pthread_rwlock_unlock (safe-pthread.h:58)
   by 0x........: main (tc12_rwl_trivial.c:29)
rwlock 0x........ was first observed at:
   at 0x........: pthread_rwlock_init (drd_pthread_intercepts.c:?)
   by 0x........: main (tc12_rwl_trivial.c:18)


ERROR SUMMARY: 1 errors from 1 contexts (suppressed: 0 from 0)