(gdb) where
#0  0x40029266 in __lll_mutex_lock_wait () from /lib/tls/libpthread.so.0
#1  0x40026751 in _L_mutex_lock_70 () from /lib/tls/libpthread.so.0
#2  0x0817c658 in ?? ()
#3  0x00000001 in ?? ()
#4  0x0817c580 in ?? ()
#5  0xbffff1ac in ?? ()
#6  0x081c9048 in ?? ()
#7  0x080c8d2c in _IO_stdin_used ()
#8  0x0805eea9 in ast_begin_shutdown (hangup=1) at channel.c:636
#9  0x08098e4b in quit_handler (num=2, nice=0, safeshutdown=1, restart=0) at asterisk.c:513
#10 0x08098ef6 in __quit_handler (num=-4) at asterisk.c:603
#11 <signal handler called>
#12 0x40029266 in __lll_mutex_lock_wait () from /lib/tls/libpthread.so.0
#13 0x40026751 in _L_mutex_lock_70 () from /lib/tls/libpthread.so.0
#14 0x401182a0 in free () from /lib/tls/libc.so.6
#15 0x401dc840 in __after_morecore_hook () from /lib/tls/libc.so.6
#16 0x0811bb08 in ?? ()
#17 0x0811bb08 in ?? ()
#18 0x00000000 in ?? ()
#19 0x0817c580 in ?? ()
#20 0x0805f222 in ast_channel_walk_locked (prev=0x80cd0000) at channel.c:469
#21 0x0807d242 in handle_chanlist (fd=1, argc=0, argv=0xfffffffc) at cli.c:314
#22 0x0807cbe8 in ast_cli_command (fd=1, s=0xfffffffc <Address 0xfffffffc out of bounds>) at cli.c:1050
#23 0x08097966 in main (argc=135225392, argv=0xbffff7fc) at asterisk.c:657