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Date:      Wed, 21 Apr 1999 17:10:58 -0400
From:      Chip Marshall <chip@jlc.net>
To:        freebsd-questions@freebsd.org
Subject:   SCSI Problems leading to reboot
Message-ID:  <19990421171058.A9007@hindenburg.eboai.org>

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At my job we have a Usenet news server setup with an AMD K6 with two
AHA-2940UW's, one for the system drives and the other for the news
drives. It is currently running FreeBSD 2.2.2. The problem is that is
reboots unexpectedly at fairly random times. I managed to find one of
the reboots in the log, and it reads:

^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
Apr 19 18:59:57 mozart /kernel: SEQADDR = 0x4 SCSISEQ = 0x12 SSTAT0 = 0x5 
	SSTAT1 = 0xa
Apr 19 18:59:57 mozart /kernel: sd12(ahc1:2:0): Queueing an Abort SCB
Apr 19 18:59:57 mozart /kernel: sd12(ahc1:2:0): Abort Message Sent
Apr 19 18:59:57 mozart /kernel: sd12(ahc1:2:0): SCB 0x5 - timed out in message 
	out phase, SCSISIGI == 0xa4
Apr 19 18:59:57 mozart /kernel: SEQADDR = 0xa1 SCSISEQ = 0x12 SSTAT0 =
0x5 SSTAT
1 = 0x2
Apr 19 18:59:57 mozart /kernel: ahc1: Issued Channel A Bus Reset. 3 SCBs aborted
Apr 19 18:59:57 mozart /kernel: Clearing bus reset
Apr 19 18:59:57 mozart /kernel: Clearing 'in-reset' flag
Apr 19 18:59:57 mozart /kernel: sd12(ahc1:2:0): no longer in timeout
Apr 19 18:59:57 mozart /kernel: sd11(ahc1:1:0): UNIT ATTENTION asc:29,1 
Apr 19 18:59:58 mozart /kernel: , retries:4
Apr 19 18:59:58 mozart /kernel: sd12(ahc1:2:0): UNIT ATTENTION asc:29,1 
Apr 19 18:59:58 mozart /kernel: , retries:4
Apr 19 19:00:00 mozart /kernel: sd14(ahc1:4:0): UNIT ATTENTION asc:29,2 
Apr 19 19:00:00 mozart /kernel: , retries:4
Apr 19 19:00:00 mozart /kernel: sd15(ahc1:5:0): UNIT ATTENTION asc:29,2 
Apr 19 19:00:00 mozart /kernel: , retries:4
Apr 19 19:00:00 mozart /kernel: sd13(ahc1:3:0): UNIT ATTENTION asc:29,2 
Apr 19 19:00:00 mozart /kernel: , retries:4

followed by ye olde reboote.
What exactly is the SCSI chain trying to do? And why should it cause
the system to reboot so unhappily?

-- 
Chip Marshall <chip@jlc.net>
John Leslie Consulting                           Director of Operations
http://www.jlc.net/~chip/                       InterNIC handle - CLM21
PGP key available on my web page              On IRC via EFnet as Magus


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