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Date: Fri, 4 Apr 1997 16:45:24 +0200
From: Luigi Rizzo <luigi@iet.unipi.it>
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Subject: i386/3195: ahc panic
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>Number:         3195
>Category:       i386
>Synopsis:       ahc panic
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Apr  4 07:00:01 PST 1997
>Last-Modified:
>Originator:     Luigi Rizzo
>Organization:
DEIT
>Release:        FreeBSD 2.2.1-RELEASE
>Environment:

	PPro, ASUS MB (Natoma), Adaptec2940U (PCI),
	unknown SCSI CD-WRITER (T.YUDEN CD-WO EW-50)

	$Id: aic7xxx.c,v 1.81.2.17 1997/03/24 19:17:33 gibbs Exp $

>Description:

	Trying to access /dev/worm0 causes the following message (from
	memory, it was on the console...):

	    worm0: ahc(0:4:0) SCB 0x0 timed out in command phase, SCSISIGI
		== 0x84, SEQADDR == 0x42
	    worm0: ahc(0:4:0) abort message in message buffer
	    worm0: ahc(0:4:0) SCB 0x0 abort completed

	    panic: Couldn't find busy SCB


	The relevant file for the error message is /sys/i386/scsi/aic7xxx.c
	tagged

	    $Id: aic7xxx.c,v 1.81.2.17 1997/03/24 19:17:33 gibbs Exp $

	While I have no interest in this particular Worm drive (except
	that it costs 2/3 the price of a Philips) I do have an
	interest in having a 2940 working...

>How-To-Repeat:

	just access /dev/worm0 , e.g. dd if=/dev/worm0

	causes the panic, in a very repeatable way.

>Fix:
>Audit-Trail:
>Unformatted: