> provide details on what this command is? A3h/0Ch is REPORT SUPPORTED OPERATION CODES
The call is most probably from dev/scsipi:scsipi_get_opcodeinfo(). I'm still unsure how resid can be 0 at that point. scsipi_enqueue_xs() sets resid to datalen (which is undocumented). Apart from the path interpreting sense info nobody tampers with resid. Can you check for resid != datalen in mpii_scsi_request() just before the xs->xs_control & XS_CTL_POLL test (and, if it fires, print whether it's a polled request)? Otherwise, I suspect ccb_done set to mpii_scsi_cmd_done where it shouldn't (i.e. some race/error for a mpt command that's not plain SCSI).
