help with interperting BT

[przemratajczak]

MaNGOS 8935 + OpenMP mtmaps

Hi, I've got problems with interpetation this crashlog:

http://www.pastebin.org/65714

[color=green]#2  0x0000000000722a76 in ThreatManager::addThreat (this=0x7f4b7cc5d4e8, pVictim=0x162a6770, pThreat=, crit=,
   schoolMask=, pThreatSpell=) at ../../../src/game/ThreatManager.cpp:395 [/color]

void ThreatManager::addThreat(Unit* pVictim, float pThreat, bool crit, SpellSchoolMask schoolMask, SpellEntry const *pThreatSpell)
{
   //function deals with adding threat and adding players and pets into ThreatList
   //mobs, NPCs, guards have ThreatList and HateOfflineList
   //players and pets have only InHateListOf
   //HateOfflineList is used co contain unattackable victims (in-flight, in-water, GM etc.)

   // not to self
   if (pVictim == getOwner())
       return;

   // not to GM
   if (!pVictim || (pVictim->GetTypeId() == TYPEID_PLAYER && ((Player*)pVictim)->isGameMaster()) )
       return;

   // not to dead and not for dead
   if(!pVictim->isAlive() || !getOwner()->isAlive() )
       return;

   assert(getOwner()->GetTypeId()== TYPEID_UNIT);

   float threat = ThreatCalcHelper::calcThreat(pVictim, iOwner, pThreat, crit, schoolMask, pThreatSpell);

   [color=Red]HostileReference* ref = iThreatContainer.addThreat(pVictim, threat);[/color]

btw. i was wondering why !pVictim check is below if (pVictim == getOwner()) but it's not the point that im going to ask.

##############################

[color="Green"]#1 0x00000000007229c0 in ThreatContainer::addThreat (this=0x162a6770,[color="Red"] pVictim=0x0[/color], pThreat=0) at ../../../src/game/ThreatManager.cpp:242 [/color]

HostileReference* ThreatContainer::addThreat(Unit* pVictim, float pThreat)
{
   [color=Red]HostileReference* ref = getReferenceByTarget(pVictim);[/color]
   if(ref)
       ref->addThreat(pThreat);
   return ref;
}

How can it be that pVictim is lost between those two functions? there is no void that could modify argument. is it caused by multithreading?