[4575] in linux-scsi channel archive
Panic in scsi.c
daemon@ATHENA.MIT.EDU (Richard Waltham)
Tue Aug 18 21:09:13 1998
From: Richard Waltham <dormouse@farsrobt.demon.co.uk>
To: linux-kernel@vger.rutgers.edu, linux-scsi@vger.rutgers.edu
Date: Wed, 19 Aug 1998 01:52:03 +0100 (BST)
Hi,
I can generate the following panic in scsi.c at will using a CD media
changer - Nakamichi MBR-7.
Happens with kernel versions 2.0.35 and 2.0.36-pre6. I haven't checked any
others.
Attempt to allocate device channel 0, target 6, lun x
Kernel Panic: No Device found in allocate_device().
If I start the following two commands running in different vc's
dd if=/dev/scdX of=/dev/null (X = 1, 2 ...)
dd if=/dev/scdY of=/dev/null (Y = 0, 1 ...)
and the second one started has Y < X I get the panic.
eg
dd if=/dev/sdc1 of=/dev/null - starting this first
dd if=/dev/scd0 of=/dev/null - then starting this
generates the panic. Starting scd0 first and then scd1 is OK - but very
sloooooow as its spending most of the time changing CDs;)
I guess the panic is caused by the call to allocate_device from
do_sr_request in sr.c but don't know why.
Anyone figure it out?
Richard
--
Richard Waltham | Work: richard@digitalinterface.demon.co.uk
At home in | Home: dormouse@farsrobt.demon.co.uk
Southampton UK | 100421.1276@compuserve.com
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