reading a backtrace

[Matthew M Murphy]

Group:

GDB generates the following backtrace... strangely, the program terminates
with a segfault after 8 steps... I'm a novice at reading backtraces,
etc..., so if anyone can coach me through I'd appreciate it.... 

(gdb) run Starting program: /home/mmmurf/dev/pc1202/.libs/bug
 Program received signal SIGSEGV, Segmentation fault. objc_msg_lookup
(receiver=0x815ec10, op=0x804d580) at objc/sarray.h:232 232 { 

(gdb) backtrace 

#0 objc_msg_lookup (receiver=0x815ec10, op=0x804d580) at
objc/sarray.h:232 
#1 0x8049764 in _i_Bug__receiveUtteranceFrom_
(self=0x816c080,
    _cmd=0x804d540, agent=0x815ec10) at Bug.m:280 
#2 0x804955c in
_i_Bug__findNeighbors (self=0x816c080, _cmd=0x804d4e8)
    at Bug.m:214 
#3 0x80493e9 in _i_Bug__step (self=0x816c080,
_cmd=0x804ded8) at Bug.m:184 
#4 0x4018cc76 in _i_Object_s__perform_
(self=0x816c080, _cmd=0x40164b20,
    aSel=0x804ded8) at DefObject.m:664 
#5 0x4015470b in
_i_ActionTo_0___performAction__ (self=0x81b4d08,
    _cmd=0x40168908, anActivity=0x81c03c8) at Action.m:246 
#6 0x4015b845
in _i_Activity_c___run_ (self=0x81c03c8, _cmd=0x401688f0)
    at XActivity.m:189 
#7 0x4015b755 in _i_Activity_c___run_
(self=0x81c0fa8, _cmd=0x401688f0)
    at XActivity.m:147 
#8 0x4015b755 in _i_Activity_c___run_
(self=0x81b4210, _cmd=0x401688f0)
    at XActivity.m:147 
#9 0x4015b755 in _i_Activity_c___run_
(self=0x81b4028, _cmd=0x401688f0)
    at XActivity.m:147 
#10 0x4015b755 in _i_Activity_c___run_
(self=0x81b7368, _cmd=0x401688f0)
    at XActivity.m:147 
#11 0x4015b755 in _i_Activity_c___run_
(self=0x81b2e08, _cmd=0x401688d8)
    at XActivity.m:147 
#12 0x4015b649 in _i_Activity_c__run
(self=0x81b2e08, _cmd=0x40058ad8)
    at XActivity.m:76 
#13 0x4004b7f7 in _i_ControlPanel__startInActivity_
(self=0x80f3170,
    _cmd=0x400592f8, activityID=0x81b2e08) at ControlPanel.m:98 
#14
0x4004c2d3 in _i_GUISwarm__go (self=0x80f97b8, _cmd=0x804d660)
    at GUISwarm.m:49
#15 0x8049a1d in main (argc=1, argv=0xbffffc54) at main.m:40       


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