Hang near end of kernel probes since r213267 (likely earlier)

David Wolfskill david at catwhisker.org
Sun Oct 3 11:29:00 UTC 2010

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)?
> > >
> > 
> > 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 at g1-222.catwhisker.org.:/usr/obj/usr/src/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%    /

* 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.

David H. Wolfskill				david at 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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