BAD_POOL_CALLER (c2)
The current thread is making a bad pool request. Typically this is at a bad IRQL level or double freeing the same allocation, etc.
Arguments:
Arg1: 00000040, Attempt to free usermode address to kernel pool
Arg2: 00000000, Starting address
Arg3: 80000000, Start of system address space
Arg4: 00000000, 0
也就是调用了ExFreePool(NULL);
原因是ExAllocPool调用可能失败返回NULL