@lglayal -- can you give here the backtrace from gdb when you get the crash with mongo-c-driver-1.3.5 with --enable-ssl=yes ? I was digging a bit in mongodb-c-driver and looks like they don't set the locking functions if they are already set: ``` static void _mongoc_openssl_thread_startup (void) { int i; gMongocOpenSslThreadLocks = (mongoc_mutex_t *)OPENSSL_malloc (CRYPTO_num_locks () * sizeof (mongoc_mutex_t)); for (i = 0; i < CRYPTO_num_locks (); i++) { mongoc_mutex_init(&gMongocOpenSslThreadLocks[i]); } if (!CRYPTO_get_locking_callback ()) { CRYPTO_set_locking_callback (_mongoc_openssl_thread_locking_callback); CRYPTO_set_id_callback (_mongoc_openssl_thread_id_callback); } } ``` --- You are receiving this because you are subscribed to this thread. Reply to this email directly or view it on GitHub: https://github.com/kamailio/kamailio/issues/660#issuecomment-231307672