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Date:      Mon, 22 Nov 2010 12:37:00 -0500
From:      Roger Hammerstein <cheeky.m@live.com>
To:        <bruce@cran.org.uk>
Cc:        freebsd-current@freebsd.org
Subject:   RE: panic with devclass_get_name (dc=0xdeadc0dedeadc0de)
Message-ID:  <BAY147-w43987CD6D7BF4B35DBA73FF93D0@phx.gbl>
In-Reply-To: <20101122172016.71e6b3ca@core.draftnet>
References:  <BAY147-w430B6B1FBC71380F63C3B3F93D0@phx.gbl>, <20101122172016.71e6b3ca@core.draftnet>

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> I wonder if this is related to
> http://www.freebsd.org/cgi/query-pr.cgi?pr=3Dkern/133286 ?

I am not sure if that is related=2C but I can also panic it
with just cp -a /usr/src to the WDC disk.

butter# mount
/dev/ad4s1a on / (ufs=2C local)
devfs on /dev (devfs=2C local=2C multilabel)
/dev/ad4s1e on /tmp (ufs=2C local=2C soft-updates)
/dev/ad4s1f on /usr (ufs=2C local=2C soft-updates)
/dev/ad4s1d on /var (ufs=2C local=2C soft-updates)
butter#

2gigs of ram and 4 gigs of swap.

butter# swapinfo
Device          1K-blocks     Used    Avail Capacity
/dev/ad4s1b       4157984        0  4157984     0%
butter#


I can also panic the machine with :
  newfs -O 2 /dev/ad8=20
  mount /dev/ad8 /a
  mkdir /a/1  /a/2
  cp -a /usr/src /a/1 &
  cp -a /usr/src /a/2 &=20

And then wait 30 seconds to a minute.
I get a bunch of g_vfs_done():ad8[write(offset=3D146023743488=2Clength=3D16=
384)]error=3D6

errors on the console and then the machine locks up entirely=2C keyboard an=
d keyboard lights unresponsive.

I had looked for devclass_get_name
and found: http://www.freebsd.org/cgi/query-pr.cgi?pr=3D85728&cat=3D
but that is old and closed=2C from releng 6=2C 2007 timeframe.


 		 	   		  =



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