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Date: Thu, 22 Feb 2007 12:10:33 +0100
From: Fabian Keil <freebsd-listen@fabiankeil.de>
To: "Petr Holub" <hopet@ics.muni.cz>
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Cc: stable@freebsd.org
Subject: Re: 6.2-RELEASE panic when blanking CD-RW media
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"Petr Holub" <hopet@ics.muni.cz> wrote:

> I've encountered a deterministic kernel panic when
> blanking one specific CD-RW media using cdrecord.

> The kernel panic details follow and dmesg is at the end of this
> email. Though I understand there's something wrong with the media,
> I think it shouldn't panic the kernel either.

> # kgdb /boot/kernel/kernel vmcore.9

> (kgdb) bt
> #0  0xc067262e in doadump ()
> #1  0xc0672afe in boot ()
> #2  0xc0672d94 in panic ()
> #3  0xc0885a04 in trap_fatal ()
> #4  0xc088576b in trap_pfault ()
> #5  0xc08853a9 in trap ()
> #6  0xc0873a7a in calltrap ()
> #7  0xc04e5e2e in acd_geom_detach ()
> #8  0xc06388f9 in one_event ()
> #9  0xc06389d1 in g_run_events ()
> #10 0xc0639de5 in g_event_procbody ()
> #11 0xc065cd34 in fork_exit ()
> #12 0xc0873adc in fork_trampoline ()
> (kgdb) x 0xc067262e
> 0xc04e5e2e <acd_geom_detach+18>:	0x03b0b0ff
> (kgdb) q

You could give the following patch a try:=20
http://www.fabiankeil.de/sourcecode/freebsd/atapi-cd.c.patch

It prevents a panic if a disc drive gets "lost"
without FreeBSD noticing it (for example because
the firmware is buggy).

See:
http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/99017
for details.

Note that the patch simply prevents the panic,
your drive will probably still be "lost" until
you reboot.

Fabian

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