(gdb) bt
#0  Unit::CastCustomSpell (this=0x88d4e9000, Victim=0x840f69000,
    spellInfo=0x8096c7ea8, bp0=0x7fffff3f6a7c, bp1=0x0, bp2=0x0,
    triggered=true, castItem=0x0, triggeredByAura=0x89f1b7600, originalCaster=
      {m_guid = 0}, triggeredBy=0x0) at SpellAuras.h:384
#1  0x00000000008a40a0 in Unit::CastCustomSpell (this=0x88d4e9000, Victim=Variable "Victim" is not available.
)
    at ../../../src/game/Unit.cpp:1321
#2  0x00000000008bda5f in Unit::CalculateDamageAbsorbAndResist (
    this=0x88d4e9000, pCaster=0x840f69000,
    schoolMask=SPELL_SCHOOL_MASK_NORMAL, damagetype=DIRECT_DAMAGE,
    damage=1027, absorb=0x7fffff3f8bb8, resist=0x7fffff3f8bbc, canReflect=true)
    at ../../../src/game/Unit.cpp:2480
#3  0x00000000008bebd8 in Unit::CalculateMeleeDamage (this=0x840f69000,
    pVictim=Variable "pVictim" is not available.
) at ../../../src/game/Unit.cpp:1830
#4  0x00000000008bff59 in Unit::AttackerStateUpdate (this=0x840f69000,
    pVictim=0x88d4e9000, attType=BASE_ATTACK, extra=false)
    at ../../../src/game/Unit.cpp:2802
#5  0x00000000007cf7dc in Player::Update (this=0x840f69000, p_time=143)
    at ../../../src/game/Player.cpp:1296
#6  0x00000000006cea5d in Map::Update (this=0x85f592000,
    t_diff=@0x7fffff3faeac) at ../../../src/game/Map.cpp:524
#7  0x00000000006cec09 in BattleGroundMap::Update (this=0x85f592000,
    diff=@0x7fffff3faeac) at ../../../src/game/Map.cpp:1869
#8  0x000000000096920d in MapInstanced::Update (this=0x85f531000,
---Type <return> to continue, or q <return> to quit---
    t=@0x7fffff3faeac) at ../../../src/game/MapInstanced.cpp:63
#9  0x00000000006e205c in MapManager::Update (this=0x80d984540, diff=Variable "diff" is not available.
)
    at ../../../src/game/MapManager.cpp:249
#10 0x00000000008e64ae in World::Update (this=0x80254d000, diff=47)
    at ../../../src/game/World.cpp:1507
#11 0x000000000052b852 in WorldRunnable::run (this=Variable "this" is not available.
)
    at ../../../src/mangosd/WorldRunnable.cpp:60
#12 0x00000000009dda3c in ACE_Based::Thread::ThreadTask (param=Variable "param" is not available.
)
    at ../../../src/shared/Threading.cpp:187
#13 0x0000000801cac4d1 in pthread_getprio () from /lib/libthr.so.3
#14 0x0000000000000000 in ?? ()
Cannot access memory at address 0x7fffff3fb000
(gdb) bt full
#0  Unit::CastCustomSpell (this=0x88d4e9000, Victim=0x840f69000,
    spellInfo=0x8096c7ea8, bp0=0x7fffff3f6a7c, bp1=0x0, bp2=0x0,
    triggered=true, castItem=0x0, triggeredByAura=0x89f1b7600, originalCaster=
      {m_guid = 0}, triggeredBy=0x0) at SpellAuras.h:384
        spell = Variable "spell" is not available.
(gdb)