Hello Everyone.
I need some help with debuging. I run a MUD based on Circle 3.0 bpl11.
When I changed the number of levels to 110 (100 mortal + 10 imms), I
needed to change the level and bhd for some mobs. Now, I have my mud
crashing sometimes when these mobs are killed.
Using gdb, i got the following:
GNU gdb 4.17.0.11 with Linux support
Copyright 1998 Free Software Foundation, Inc.
<snip>
#0 0x50555247 in ?? ()
(gdb)
Interesting, this hex address (50555247) represents the letters "PURG",
that is found 2 times on the core dump, both on the help files. I thing
that some buffer overrun was ocurred and overwriten the EIP. Looking at
static bufs:
(gdb) p buf+8000
$1 = 0x80cdb60 ""
(gdb) p buf1+8000
$2 = 0x80c9860 ""
(gdb) p buf2+8000
$3 = 0x80cb860 ""
(gdb) p arg+8000
$4 = 0x80c7840 ""
No overflows... Looking at the content of them, some interesting thing:
(gdb) p (char *) buf2
$5 = 0x80c9920 "the corpse of the Ki-Rin"
The stack is:
(gdb) bt
#0 0x50555247 in ?? ()
#1 0x804a368 in heartbeat (pulse=114240) at comm.c:719
#2 0x804a279 in game_loop (mother_desc=3) at comm.c:690
#3 0x80496fa in init_game (port=4000) at comm.c:269
#4 0x804961e in main (argc=3, argv=0x7ffffd34) at comm.c:222
#5 0x2ab05cb3 in __libc_start_main (main=0x8049400 <main>, argc=3,
argv=0x7ffffd34, init=0x8048e70 <_init>, fini=0x808e2fc <_fini>,
rtld_fini=0x2aab5350 <_dl_fini>, stack_end=0x7ffffd2c)
at ../sysdeps/generic/libc-start.c:78
(gdb) fr 1
#1 0x804a368 in heartbeat (pulse=114240) at comm.c:719
719 perform_violence();
I think that is something inside perform_violence() that overflow and
the SO wasn't be able to return to correct address, but I have
absolutely no idea on how to find it. Someone can help me?
Thanks.
PS: Excuse-me for my broken english, my first language is portuguese.
--
,--[ Juliano Ravasi Ferraz, F.R+C ]--------------------.
| `-[ jferraz@linkway.com.br ]----------------------.|
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| Rayon Eletônica e Informática Ltda - Diretor Técnico |
| Linkway Internet Provider - Unidade Descalvado |
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