LookasideListEx alignment

I am getting a spurious BSOD when initializing an Ex lookaside list. The debugger is showing this:

ERROR_CODE: (NTSTATUS) 0x80000002 - {EXCEPTION} Alignment Fault A datatype misalignment was detected in a load or store instruction.

This is in a Storport miniport. I’m not quite sure what to make of it yet. Thoughts?