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Date:      Sat, 25 Sep 1999 03:07:39 +0200 (CEST)
From:      Phil Regnauld <regnauld@S44.eu.org>
To:        FreeBSD-gnats-submit@freebsd.org
Subject:   kern/13940: Panic with dd on block/"cooked" devices using 3.3-RELEASE
Message-ID:  <199909250107.DAA11769@flow.S44.eu.org>

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>Number:         13940
>Category:       kern
>Synopsis:       Panic with dd on block/"cooked" devices using 3.3-RELEASE
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Sep 24 18:10:01 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator:     Phil Regnauld
>Release:        FreeBSD 3.3-RELEASE i386
>Organization:
Freenix User Group
>Environment:

	PII-400, 128 MB RAM, NCR875 UW SCSI, 1 x 4.5 GB SCSI IBM,
	2 x 10 GB EIDE QUANTUM, 3.3-RELEASE

>Description:

	When using dd to copy a block device to another (i.e.:
	/dev/wd0a -> /dev/wd2a for example), the system panics.

	Greg Lehey <grog@lemis.com> is aware of the problem.

>How-To-Repeat:

	# dd if=/dev/rwd0a of=/dev/rwd2a bs=1024k conv=notrunc
	dd: /dev/rwd2a: Read-only file system
	1+0 records in
	0+0 records out
	0 bytes transferred in 0.059349 secs (0 bytes/sec)
	# mount
	da0s1a on / (local, read-only, writes: sync 2 async 0)
	# dd if=/dev/wd0a of=/dev/wd2a bs=1024k conv=notrunc
	195+1 records in
	195+1 records pout
	a204800000 bytes ntransferred in 2i8.291105 secs (7c239024 bytes/sec:)
 	vinvalbuf: dirty bufs
	Debugger("panic")
	Stopped at      Debugger+0x37:  movl    $0,in_Debugger

>Fix:
	
	


>Release-Note:
>Audit-Trail:
>Unformatted:


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