(gdb) bt
#0  __GI___pthread_mutex_lock (mutex=0x7f172ac9e700) at ../nptl/pthread_mutex_lock.c:66
#1  0x0000000000549c4e in ast_reentrancy_lock (lt=0x0) at /data/development/asterisk/asterisk_13_git/include/asterisk/lock.h:464
#2  0x000000000054a766 in __ast_pthread_mutex_lock (filename=0x7f175356534b "app_voicemail.c", lineno=3008, func=0x7f175356e780 <__PRETTY_FUNCTION__.19541> "init_mailstream", 
    mutex_name=0x7f17535671c0 "&mail_open_lock", t=0x7f17537770e0 <mail_open_lock>) at lock.c:289
#3  0x00007f17535340ac in init_mailstream (vms=0x1b80c60, box=0) at app_voicemail.c:3008
#4  0x00007f1753531962 in __messagecount (context=0x7f172ac9cd16 "default", mailbox=0x7f172ac9cd10 "98011", folder=0x7f176c427b7c "INBOX") at app_voicemail.c:2502
#5  0x00007f175353313c in inboxcount2 (mailbox_context=0x7f176401a2e0 "98011@default", urgentmsgs=0x7f172ac9dd4c, newmsgs=0x7f172ac9dd44, oldmsgs=0x7f172ac9dd48)
    at app_voicemail.c:2817
#6  0x00007f1753556897 in poll_subscribed_mailbox (mwi_sub=0x7f176401a2c0) at app_voicemail.c:12834
#7  0x00007f175355698c in poll_subscribed_mailboxes () at app_voicemail.c:12852
#8  0x00007f1753556ae3 in mb_poll_thread (data=0x0) at app_voicemail.c:12875
#9  0x0000000000620ad8 in dummy_start (data=0x1705200) at utils.c:1237
#10 0x00007f17a41d2182 in start_thread (arg=0x7f172ac9e700) at pthread_create.c:312
#11 0x00007f17a348b47d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111
(gdb) up
#1  0x0000000000549c4e in ast_reentrancy_lock (lt=0x0) at /data/development/asterisk/asterisk_13_git/include/asterisk/lock.h:464
464		if ((res = pthread_mutex_lock(&lt->reentr_mutex))) {
(gdb) 
#2  0x000000000054a766 in __ast_pthread_mutex_lock (filename=0x7f175356534b "app_voicemail.c", lineno=3008, func=0x7f175356e780 <__PRETTY_FUNCTION__.19541> "init_mailstream", 
    mutex_name=0x7f17535671c0 "&mail_open_lock", t=0x7f17537770e0 <mail_open_lock>) at lock.c:289
289						ast_reentrancy_lock(lt);
(gdb) print t->tracking
$7 = 0
(gdb) print lt
$8 = (struct ast_lock_track *) 0x0
(gdb) print t->track
$9 = (struct ast_lock_track *) 0x0
(gdb) print canlog
$10 = 0
(gdb) list
284				if (res == EBUSY) {
285					wait_time = time(NULL) - seconds;
286					if (wait_time > reported_wait && (wait_time % 5) == 0) {
287						__ast_mutex_logger("%s line %d (%s): Deadlock? waited %d sec for mutex '%s'?\n",
288								   filename, lineno, func, (int) wait_time, mutex_name);
289						ast_reentrancy_lock(lt);
290	#ifdef HAVE_BKTR
291						__dump_backtrace(&lt->backtrace[lt->reentrancy], canlog);
292	#endif
293						__ast_mutex_logger("%s line %d (%s): '%s' was locked here.\n",