(gdb) bt full
#0  _mfree (ptr=0x1, file=0x82337ff "unit.c", line=2337, func=0x8233a68 "unit_free") at malloc.c:388
        head = 0xfffffff5
#1  0x081e46bb in unit_free (bl=0xb353410, clrtype=CLR_TELEPORT) at unit.c:2337
        i = 0
        __FUNCTION__ = "unit_free"
#2  0x081e4b12 in unit_free_pc (sd=0xb353410) at unit.c:2283
No locals.
#3  0x0807a971 in map_quit (sd=0xb353410) at map.c:1739
        i = 136305984
        __FUNCTION__ = "map_quit"
#4  0x08098214 in clif_parse (fd=15) at clif.c:17636
        cmd = 32768
        packet_len = 1
        sd = 0xb353410
        pnum = 0
#5  0x081f92c8 in send_shortlist_do_sends () at socket.c:1528
        fd = 15
        i = 0
#6  0x081faa45 in do_sockets (next=50) at socket.c:792
        rfd = {__fds_bits = {32768, 0 <repeats 31 times>}}
        timeout = {tv_sec = 0, tv_usec = 41088}
        ret = 0
        i = 15
#7  0x081f885b in main (argc=1, argv=0xbfd27a24) at core.c:350
        next = 136526440
(