(gdb) bt
#0  Creature::GetPetAutoSpellOnPos (this=0x935809000, pos=0 '\0')
    at Unit.h:1043
#1  0x0000000000974704 in PetAI::UpdateAI (this=0x9322d10a0, diff=Variable "diff" is not available.
)
    at ../../../src/game/PetAI.cpp:215
#2  0x0000000000596e04 in Creature::Update (this=0x935809000, diff=479)
    at ../../../src/game/Creature.cpp:534
#3  0x000000000088af8f in TemporarySummon::Update (this=0x935809000, diff=479)
    at ../../../src/game/TemporarySummon.cpp:140
#4  0x00000000006d37cb in VisitorHelper<MaNGOS::ObjectUpdater, Creature> (
    v=@0x7fffff3fadf0, c=Variable "c" is not available.
) at GridNotifiersImpl.h:44
#5  0x00000000006d518d in VisitorHelper<MaNGOS::ObjectUpdater, Creature, TypeList<DynamicObject, TypeList<Corpse, TypeNull> > > (v=@0x7fffff3fadf0, c=Variable "c" is not available.
)
    at TypeContainerVisitor.h:57
#6  0x00000000006dc6e2 in Cell::Visit<MaNGOS::ObjectUpdater, TypeMapContainer<TypeList<GameObject, TypeList<Creature, TypeList<DynamicObject, TypeList<Corpse, TypeNull> > > > > > (this=0x7fffff3fade0, standing_cell=@0x0,
    visitor=@0x7fffff3fadc0, m=@0x93411d000) at TypeContainerVisitor.h:80
#7  0x00000000006cbc86 in Map::Update (this=0x93411d000,
    t_diff=@0x7fffff3faeac) at ../../../src/game/Map.cpp:572
#8  0x00000000006cc199 in InstanceMap::Update (this=0x93411d000,
    t_diff=@0x7fffff3faeac) at ../../../src/game/Map.cpp:1866
#9  0x000000000096e97d in MapInstanced::Update (this=0x934102000,
    t=@0x7fffff3faeac) at ../../../src/game/MapInstanced.cpp:63
---Type <return> to continue, or q <return> to quit---
#10 0x00000000006e29cc in MapManager::Update (this=0x80c827cc0, diff=Variable "diff" is not available.
)
    at ../../../src/game/MapManager.cpp:249
#11 0x00000000008e99e8 in World::Update (this=0x80254d000, diff=479)
    at ../../../src/game/World.cpp:1514
#12 0x000000000052c0a2 in WorldRunnable::run (this=Variable "this" is not available.
)
    at ../../../src/mangosd/WorldRunnable.cpp:60
#13 0x00000000009e1c8c in ACE_Based::Thread::ThreadTask (param=Variable "param" is not available.
)
    at ../../../src/shared/Threading.cpp:187
#14 0x0000000801cb94d1 in pthread_getprio () from /lib/libthr.so.3
#15 0x0000000000000000 in ?? ()
Cannot access memory at address 0x7fffff3fb000
(gdb) bt full
#0  Creature::GetPetAutoSpellOnPos (this=0x935809000, pos=0 '\0')
    at Unit.h:1043
No locals.
#1  0x0000000000974704 in PetAI::UpdateAI (this=0x9322d10a0, diff=Variable "diff" is not available.
)
    at ../../../src/game/PetAI.cpp:215
        spellID = Variable "spellID" is not available.
(gdb)