For this particular crash, you can find out what zone it occured in by executing:
Code:
gdb ./zone <core file name>
<snip>
(gdb) frame 6
#6 0x0810bc19 in main (argc=142145976, argv=0x9) at net.cpp:473
473 if(net.group_timer.Enabled() && net.group_timer.Check())
(gdb) print zone->short_name
$1 = 0x8431068 "potactics"
(gdb) frame 1
(gdb) print name
<should print client name involved in crash>
(gdb) print iOther->name
<should print mob name in involved in crash>
If the zone and mob name are fairly consistent, it may give you somewhere to concentrate on, e.g. any quest .pl files that mob is involved in.