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Date:      Sun, 3 Oct 2010 04:28:59 -0700
From:      David Wolfskill <david@catwhisker.org>
To:        Brandon Gooch <jamesbrandongooch@gmail.com>, current@freebsd.org
Subject:   Re: Hang near end of kernel probes since r213267 (likely earlier)
Message-ID:  <20101003112859.GW1535@albert.catwhisker.org>
In-Reply-To: <20101002033859.GK1535@albert.catwhisker.org>
References:  <20101001212038.GE1535@albert.catwhisker.org> <20101001233001.GG1535@albert.catwhisker.org> <20101002013344.GI1535@albert.catwhisker.org> <AANLkTiny8TxsT0jObNqF7Jnkp-wrPBSecp_Y3%2BnKazNg@mail.gmail.com> <20101002033859.GK1535@albert.catwhisker.org>

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On Fri, Oct 01, 2010 at 08:38:59PM -0700, David Wolfskill wrote:
> On Fri, Oct 01, 2010 at 08:56:13PM -0500, Brandon Gooch wrote:
> > ...
> > > Any ideas on what mught be causing CURRENT to hang -- sometimes
> > > -- given that it appears to involve the Modular Bay (or the specific
> > > device that is in the bay during the hang)?
> > >
> >=20
> > If you haven't already, it may be worth trying 'options ATA_CAM' in
> > your kernel config.
> ...
> And -- probably more important for this discussion -- I was unable to
> re-create the failing condition: the machine booted Just Fine every
> time I tried it, whether the CD/DVD drive was inserted or not.
> ...

That assessment (on my part) was premature.

The attempt to boot from slice 4, running:

FreeBSD g1-222.catwhisker.org. 9.0-CURRENT FreeBSD 9.0-CURRENT #3 r213357: =
Sat Oct  2 06:29:23 PDT 2010     root@g1-222.catwhisker.org.:/usr/obj/usr/s=
rc/sys/CANARY  i386

immediately prior to the one I just did:

* was using a kernel with the ATA_CAM enabled, as may be noted by
  the device name in:

  g1-222(9.0-C)[2] df -h /
  Filesystem      Size    Used   Avail Capacity  Mounted on
  /dev/ada0s4a    1.4G    327M    1.0G    25%    /
  g1-222(9.0-C)[3]=20

* hung at the previously-discussed point.

It appears that running a kernel with option ATA_CAM may well reduce the
probability of this apparently intermittent mode of failure.

Peace,
david
--=20
David H. Wolfskill				david@catwhisker.org
Depriving a girl or boy of an opportunity for education is evil.

See http://www.catwhisker.org/~david/publickey.gpg for my public key.

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