http://bugs.winehq.org/show_bug.cgi?id=31684
--- Comment #2 from rankincj@yahoo.com 2012-09-12 18:30:13 CDT --- Definitely heap corruption:
0009:Call KERNEL32.MulDiv(01312d00,00001f40,00989680) ret=7f66cf035bdc 0009:Ret KERNEL32.MulDiv() retval=00003e80 ret=7f66cf035bdc 0009:Call KERNEL32.MulDiv(00001f40,00009c40,00989680) ret=7f66cf035c06 0009:Ret KERNEL32.MulDiv() retval=00000020 ret=7f66cf035c06 0009:Call ntdll.RtlAllocateHeap(00010000,00000000,00007d00) ret=7f66cf035ca7 0009:Ret ntdll.RtlAllocateHeap() retval=039b4cc0 ret=7f66cf035ca7
...
0009:Call ntdll.RtlFreeHeap(00010000,00000000,039b4cc0) ret=7f66cf031e2c err:heap:HEAP_ValidateInUseArena Heap 0x10000: block 0x39b4cc0 tail overwritten at 0x39bc9c0 (byte 0/24 == 0x00)
I generated this from the WoW login screen without even logging in.