[Swarm-Support] Translating gdb output

[Crile Doscher]

Hi there all,
  I'm wondering if anyone could help me translate some gdb output.
Cumec is a volume of water moving over a riverbed. findSteepestSlope is
a method to determine which cell to move to based on the slope, px and
py are coordinates of the eight surrounding neighbours. Cumec.m:90 sends
the flow into the findSteepestSlope method and Cumec.m:214 is a call to
a space object to get an elevation value at a particular cell.  We're a
good 500 or more timesteps into the programme when SIGSEGV is received.
Many thanks in advance for any help.  Swarm is running under Fedora Core
5
Crile

gdb output:
Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread -1208789328 (LWP 2641)]
0x005a857a in objc_msg_lookup () from /usr/lib/swarm/libswarm.so.0
(gdb) bt
#0  0x005a857a in objc_msg_lookup () from /usr/lib/swarm/libswarm.so.0
#1  0x0804de6f in -[Cumec findSteepestSlopeAtX:Y:] (self=0x9ff93b0,
    _cmd=0x8059310, px=0xbfe18fa8, py=0xbfe18fa4) at Cumec.m:214
#2  0x0804d887 in -[Cumec step] (self=0x9ff93b0, _cmd=0x8056b78) at
Cumec.m:90
#3  0x005840df in __builtin_avcall () from /usr/lib/swarm/libswarm.so.0
#4  0x005819b2 in objc_call () from /usr/lib/swarm/libswarm.so.0
#5  0x005709fe in updateTarget () from /usr/lib/swarm/libswarm.so.0
#6  0x00548dad in get_number_of_arguments ()
from /usr/lib/swarm/libswarm.so.0
#7  0x00554b1e in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#8  0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#9  0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#10 0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#11 0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#12 0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#13 0x00554926 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#14 0x00554f72 in _activity_context_error ()
from /usr/lib/swarm/libswarm.so.0
#15 0x004e0ce1 in swarm_force_references ()
from /usr/lib/swarm/libswarm.so.0
#16 0x004e16fa in swarm_force_references ()
from /usr/lib/swarm/libswarm.so.0
#17 0x08049646 in main (argc=0, argv=0x91) at main.m:36
(gdb)