Probing invalid address.

This stop is generated if Application Verifier detects an IsBadXXXPtr call with an invalid address (e.g. a kernel-mode address, instead of a normal user-mode address) for the memory buffer to be probed.

Parameter1 - Start address

Parameter2 - Memory block size

Parameter3 - Invalid address

Parameter4 - Not used

Description - Probing invalid address

Verifier stop code 0603.

To debug this stop look at the current stack trace (kb) and try to determine why the caller of the IsBadXXXPtr function ended up with an invalid address. Many times, the address is plain bogus, e.g. an uninitialized pointer.

MSDN library lists a few reasons why applications should not use the IsBadXXXPtr APIs:

• In a preemptive multitasking environment, it is possible for some other thread to change the process's access to the memory being tested.
  
  
• Dereferencing potentially invalid pointers can disable stack expansion in there threads. A thread exhausting its stack, when stack expansion has been disabled, results in the immediate termination of the parent process, with no pop-up error window or diagnostic information.
  
  
• Threads in a process are expected to cooperate in such a way that one will not free memory that the other needs. Use of this function does not negate the need to do this. If this is not done, the application may fail in an unpredictable manner.
  
  

Because of all these reasons, the recommendation is to never use these APIs.