Code running under a system thread has no special handling in regard to
IRQL. Neither, as I said, in regard to pageability of its storage. Said
code will be ordinarily running in kernel mode (CPL 0). That gives it
full 4G (in IA-32 anyway) addressability and access to privileged
instructions. That’s about it.
As for your error, I’ve seen that when I had a bad pointer that pointed
to a part of virtual space that’s non-pageable when allocated but that
had not been actually allocated.
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James Antognini
Windows DDK MVP