From owner-freebsd-stable  Mon Mar 27 22:32:38 2000
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Date: Mon, 27 Mar 2000 23:31:51 -0700
From: "Kenneth D. Merry" <ken@kdm.org>
To: Mikhail Teterin <mi@aldan.algebra.com>
Cc: stable@FreeBSD.ORG
Subject: Re: panic on a flaky SCSI CD
Message-ID: <20000327233150.A2097@panzer.kdm.org>
References: <200003280401.XAA12345@xxx.video-collage.com>
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In-Reply-To: <200003280401.XAA12345@xxx.video-collage.com>; from mi@video-collage.com on Mon, Mar 27, 2000 at 11:01:26PM -0500
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On Mon, Mar 27, 2000 at 23:01:26 -0500, mi@video-collage.com wrote:
> I have this flaky SCSI CD, which works sometimes :)
> When it fails, I see something like the following
> popping up:
> 
> Creating DISK cd0
> (cd0:ncr1:0:6:0): got CAM status 0x4a
> (cd0:ncr1:0:6:0): fatal error, failed to attach to device
> (cd0:ncr1:0:6:0): lost device
> (cd0:ncr1:0:6:0): removing device entry

That is caused by a selection timeout.  There's not a whole lot we can do
about that.

> Under 3.4, if I was to try to mount a CD in this drive,
> when it was in the bad mood, I'd simply get an error. Now,
> with 4.0 the thing panics :(

That's not good.  In order to find the problem, we'll need a little more
information.  Take a look at the handbook section on kernel debugging:

http://www.freebsd.org/handbook/kerneldebug.html

Configure your system to make a crash dump, and then get a stack trace from
gdb.  That should provide enough information to find the problem.

Thanks,

Ken
-- 
Kenneth Merry
ken@kdm.org


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