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Date: Thu, 21 Mar 1996 12:19:12 -0500
From: "Brian R. Haug" <haug@dorothy.columbiasc.ncr.com>
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Subject: i386/1097: system hang during tape rewind/aic7870 controller
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>Number:         1097
>Category:       i386
>Synopsis:       system hang during tape rewind/aic7870 controller
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Mar 21 14:30:01 PST 1996
>Last-Modified:
>Originator:     Brian R. Haug
>Organization:
Personal Machine
>Release:        FreeBSD 2.1-STABLE i386
>Environment:

	aic7870 controller, WANGTEK 5525ES SCSI 75F5 tape drive

>Description:

	interrupted a cpio from tape, system locked up shortly thereafter.
	A separate window doing ls -lR / stopped producing output
	The following messages were typicly seen on the console:
		ahc0: target 1, lun 0 (sd1) timed out
		st0 (ahc0:5:0): BUS DEVICE RESET message queued
		ahc0: target 0, lun 0 (sd0) timeout
	I'm guessing the problem has something to do with a rewind operation
	taking a "long" period of time
	Attempting to debug this, I found that the macro RESTART_SEQUENCER
	at the end of ahc_reset_channel never completed


>How-To-Repeat:

	cpio -it </dev/rst0
	then interrupt after a brief period of time

	If usefull I can repeat the tests with new modules provided

>Fix:
	workaround:
	copy the files /usr/src/sys/dev/aic7xxx/* from a 2.0.5 distribution

>Audit-Trail:
>Unformatted: