Date: Sun, 28 Aug 2005 09:52:54 +0200 From: Fabian Keil <freebsd-listen@fabiankeil.de> To: Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> Cc: freebsd-current@freebsd.org Subject: Re: Reproducible FreeBSD 6.0-BETA2 panic - probably ATA-ng related Message-ID: <20050828095254.3de97e88@localhost> In-Reply-To: <20050823133046.Q73182@ury.york.ac.uk> References: <20050821150125.56f992e0@localhost> <20050823133046.Q73182@ury.york.ac.uk>
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Gavin Atkinson <gavin.atkinson@ury.york.ac.uk> wrote:
> On Sun, 21 Aug 2005, Fabian Keil wrote:
> > I own a Plextor PlexWriter Premium, the drive has a buggy firmware
> > which crashes if you try to burn multi session in SAO mode.
> > On FreeBSD 6.0-BETA2 a panic is caused:
>
> [snip the CD ROM drive detaching...]
> It's a known issue. I see exactly this same panic 80% of the time on my
> laptop on resume from ACPI suspend. I believe it was introduced during
> the newbus-ification of ATA-mk3. On the call to acd_geom_detach,
> acd_softc is already null.
>
> (kgdb) f 23
> #23 0xc04dd936 in acd_geom_detach (arg=0xc16dd680, flag=0)
> at /usr/src/sys/dev/ata/atapi-cd.c:199
> 199 g_wither_geom(cdp->gp, ENXIO);
> (kgdb) list
> 194 acd_geom_detach(void *arg, int flag)
> 195 {
> 196 struct acd_softc *cdp = device_get_ivars(arg);
> 197
> 198 /* signal geom so we dont get any further requests */
> 199 g_wither_geom(cdp->gp, ENXIO);
> 200
> 201 /* fail requests on the queue and any thats "in flight" for this device */
> 202 ata_fail_requests(arg);
> 203
> (kgdb) p cdp
> $5 = (struct acd_softc *) 0x0
Thanks for the information. Is this the problem you described in
<http://lists.freebsd.org/pipermail/cvs-src/2005-May/045876.html>;
and did you already find the causing commit?
Fabian
--
http://www.fabiankeil.de/
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