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Date:      Tue, 19 May 1998 11:27:53 -0400 (EDT)
From:      andrew@whine.com
To:        FreeBSD-gnats-submit@FreeBSD.ORG
Subject:   kern/6689: kern_physio.c doing bad things with SCSI i/o
Message-ID:  <199805191527.LAA08909@why.whine.com>

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>Number:         6689
>Category:       kern
>Synopsis:       kern_physio.c splits requests breaking cdrecord/cdda
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue May 19 08:30:01 PDT 1998
>Last-Modified:
>Originator:     Andrew Herdman
>Organization:
N/A
>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

	FreeBSD 3.0-current May 12/98
	Pentium 133, 128 MB ram, 512k level II cache
	2 x NCR 53C810 SCSI Adaptors
	Yamaha CDR4260t CD-R(W)

>Description:

	When using cdrecord 1.6, and cdda, the following message
	is reported by the kernel, and the operation fails.

	cd0: physio split the request.. cannot proceed


>How-To-Repeat:

	use cdda or cdrecord, for example

	cdda2wav -D 1,1,0 -t 1
	cdrecord -v -dummy speed=4 dev=1,1,0 /iso.image

>Fix:
	
	Fix used to be to back sys/kern/kern_physio.c to version
	1.22.  This version no longer compiles into the -current
	kernel.  This problem was also affecting scsi scanners
	and according to a message I got from Amancio Hasty on
	the 5th of April, that this has been fixed for the
	scanner problem.

>Audit-Trail:
>Unformatted:

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