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//0x20 bytes (sizeof)
struct _WAITING_IRP
{
    struct _LIST_ENTRY Links;                                               //0x0
    struct _IRP* Irp;                                                       //0x8
    VOID (*CompletionRoutine)(VOID* arg1, struct _IRP* arg2);               //0xc
    VOID* Context;                                                          //0x10
    struct _KEVENT* Event;                                                  //0x14
    ULONG Information;                                                      //0x18
    UCHAR BreakAllRH;                                                       //0x1c
};