(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  0x401182a0 in free () from /lib/tls/libc.so.6
#3  0x401dc840 in __after_morecore_hook () from /lib/tls/libc.so.6
#4  0x0814e5c0 in ?? ()
#5  0x0814e5c0 in ?? ()
#6  0x00000000 in ?? ()
#7  0x0818bf48 in ?? ()
#8  0x0805f222 in ast_channel_walk_locked (prev=0x401dc840) at channel.c:469
#9  0x0807d242 in handle_chanlist (fd=1, argc=0, argv=0xfffffffc) at cli.c:314
#10 0x0807cbe8 in ast_cli_command (fd=1, s=0xfffffffc <Address 0xfffffffc out of bounds>) at cli.c:1050
#11 0x08097966 in main (argc=135225392, argv=0xbffff3dc) at asterisk.c:657