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Subject: kern/5624: scsi tape woes
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>Number:         5624
>Category:       kern
>Synopsis:       dumping to tape causes scsi bus reset
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb  1 21:00:00 PST 1998
>Last-Modified:
>Originator:     John Preisler
>Organization:
vapornet
>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

2940u and hp 1533a scsi tape drive in a p166 machine running -current

>Description:

dumping to tape causes scsi bus reset.  not logged in kernel, but set to console:
ahc0: Issued Channel A Bus Reset. 4 SCBs aborted
sd0: SCB 0x1 - timed out in message in phase, SCSISIGI == 0xe6
SEQADDR = 0xca SCSISEQ = 0x12 SSTAT0 = 0x2 STAT1 = 0x3
sd0: abort message in message buffer
sd0: SCB 0x1 - timed out in message in phase, SCSISIGI == 0xf6
SEQADDR = 0xca SCSISEQ = 0x12 SSTAT0 = 0x2 SSTAT1 = 0x3
sd0: no longer in timeout

over and over and over again until the machine is physically reset [reset button, power cycle, etc]


pertinent parts of my demsg:

ahc0: <Adaptec 2940 Ultra SCSI host adapter> rev 0x00 int a irq 11 on pci0.19.0
ahc0: aic7880 Single Channel, SCSI Id=7, 16/255 SCBs
scbus0 at ahc0 bus 0
ahc0: target 0 Tagged Queuing Device
sd0 at scbus0 target 0 lun 0
sd0: <SEAGATE ST32151N 0530> type 0 fixed SCSI 2
sd0: Direct-Access 2049MB (4197405 512 byte sectors)
cd0 at scbus0 target 1 lun 0
cd0: <NEC CD-ROM DRIVE:461 2.3d> type 5 removable SCSI 2
cd0: CD-ROM can't get the size
st0 at scbus0 target 3 lun 0
st0: <HP C1533A 9608> type 1 removable SCSI 2
st0: Sequential-Access density code 0x24, variable blocks, write-enabled



>How-To-Repeat:

use gnu tar to dump to scsi tape drive.  these used to be intermittent now with the latest build its ever time but i didnt notice any recent scsi commits.

>Fix:
	
human sacrifice to scsi god had no effect.

>Audit-Trail:
>Unformatted: