malloc errors and SwarmFest

[Matthew Hare]

hi

can you tell me what generally is the problem if I receive a seg fault in 
_smalloc ? My guess is that I'm overwriting a used piece of memory - is that 
right - I'm getting this infuriatingly intermittent bug at the following stage 
when I'm creating an object instance in findYoungHeatherAround_Y_ (the create 
is done using globalZone)....

#0  0xef5bb850 in _smalloc ()
#1  0xef5bb884 in malloc ()
#2  0x7946c in _i_Zone_c__allocIVars_ (self=0x18a5d0, _cmd=0x152164, 
    aClass=0x13dfdc) at Zone.m:97
#3  0x78c8c in _c_CreateDrop_s__createBegin_ (self=0x13dfdc, _cmd=0x152154, 
    aZone=0x18a5d0) at Create.m:38
#4  0x78c04 in _c_CreateDrop_s__create_ (self=0x13dfdc, _cmd=0x13e04c, 
    aZone=0x18a5d0) at Create.m:28
#5  0x26004 in _i_Grouse__findYoungHeatherAround_Y_ (self=0x2a8ab8, 
    _cmd=0x140770, px=0xeffff00c, py=0xeffff008) at Heatbug.m:418
#6  0x2e5d8 in _i_ForageExpert1__forage_ (self=0x20c1f0, _cmd=0x14299c, 
    heatbuglist=0x260a80) at forage.m:258
#7  0x7625c in _i_Object_s__perform_with_ (self=0x20c1f0, _cmd=0x14bb3c, 
    aSel=0x14299c, anObject1=0x260a80) at DefObject.m:250
#8  0x5ea30 in _i_ActionTo_1___performAction__ (self=0x2782a8, _cmd=0x14bf6c, 
    anActivity=0x288a30) at Action.m:191
#9  0x60588 in _i_Activity_c___run_ (self=0x288a30, _cmd=0x14bf54)
    at Activity.m:482


As always thanks for your help!
Matt

p.s. is there still room for one more at SwarmFest - I'd love to come and find 
out more about what else is going on in the Swarm community *and*, if you think 
people would be interested, I can give a demo of a workbench I'm developing 
usingthe Swarm toolkit that facilitates the setting up and comparison of 
alternative domain simulations based on conflicting expert theories. My example 
domain is the politically thorny and often bloody avian world of red grouse 
population dynamics and their management in Scotland. The blood flowing more 
often between arguing scientists than between the birds themselves ...  I'll 
have a web site sorted out by Christmas to post on the user community page if 
you want more info!