W2K, blue screen 0x000000C4 while unloading filter driver

Hi,

when I unload my file filter driver under W2K while the driver verifier is
running, I get the following BSOD:

*** STOP: 0x000000C4 (0x00000060, 0x00000000, 0x00000B8C, 0x00000026)

A device driver attempting to corrupt the system has been caught.
The failty driver currently on the kernel stack must be replaced
with a working version.

Tracing the debug information does not help much, because the Unload
routine is executed normally without errors. The BSOD occurs after the
Unload routine is executed.

Any clues here ?

With kind regards,

Bartjan Wattel