Notes on kern/57133

[Brian Buhrow <buhrow%nfbcal.org@localhost>]

	hello everyone!  Recently I ran across the problem described in kern/57133 with the
mpii(4) driver.  I patched sys/dev/pci/mpii.c to provide more diagnostic information when the
condition occurs and to avoid the panic.  I also provided output showing the SCSI command that
triggers the condition. Could someone look at the output below, or checkout the bug report in
gnats and provide details on what this command is?  I also looked through the kernel sources
and don't see any other drivers that implement the assertion that triggered the original panic
which created the bug report.  Any reason I shouldn't commit the work around for the mpii(4)
driver?  I realize it doesn't fix the actual problem, but it will allow folks to use systems
with NetBSD that present the problem and will provide diagnostic details which can be reported
back to the community for further analysis.


Thoughts?
-Brian


[  10.5574554] sd0 at scsibus0 target 0 lun 0: <ATA, WDC WD4003FFBX-6, 0A83> disk fixed
[  10.5574554] sd0: 3726 GB, 3815448 cyl, 16 head, 127 sec, 512 bytes/sect x 7814037168 sectors
[  10.5681363] dk0 at sd0: "1adc589e-4f32-11ee-b97c-00259036fd2e", 7814033005 blocks at 34, type: raidframe
[  10.5853388] sd0: tagged queueing
[  10.7574556] mpii0: resid = 0, datalen = 16384
[  10.7574556] mpii0: SCSI command info is: 0xa3 0c 80 00 00 00 00 00 40 00 00 00
sd1 at scsibus0 target 1 lun 0: <ATA, WDC WD4003FFBX-6, 0A83> disk fixed
[  10.7774550] sd1: 3726 GB, 3815448 cyl, 16 head, 127 sec, 512 bytes/sect x 7814037168 sectors
[  10.8374548] mssd1: tagged queueing
[  11.0074552] mpii0: resid = 0, datalen = 16384
[  11.0074552] mpii0: SCSI command info is: 0xa3 0c 80 00 00 00 00 00 40 00 00 00
sd2 at scsibus0 target 2 lun 0: <ATA, WDC WD4003FFBX-6, 0A83> disk fixed
[  11.0274552] sd2: 3726 GB, 3815448 cyl, 16 head, 127 sec, 512 bytes/sect x 7814037168 sectors
[  11.0574559] sd2: 3907019088 trailing sectors not covered by disklabel
[  11.0674553] sd2: tagged queueing
[  11.2574559] mpii0: resid = 0, datalen = 16384
[  11.2574559] mpii0: SCSI command info is: 0xa3 0c 80 00 00 00 00 00 40 00 00 00
sd3 at scsibus0 target 5 lun 0: <ATA, WDC WD4003FFBX-6, 0A83> disk fixed
[  11.2774557] sd3: 3726 GB, 3815448 cyl, 16 head, 127 sec, 512 bytes/sect x 7814037168 sectors
[  11.2874554] dk1 at sd3: "549e5298-5113-11ee-910e-00259036fd2e", 7814033005 blocks at 34, type: raidframe
[  11.2974554] sd3: tagged queueing