RE: panic with devclass_get_name (dc=0xdeadc0dedeadc0de)

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

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

butter# mount
/dev/ad4s1a on / (ufs, local)
devfs on /dev (devfs, local, multilabel)
/dev/ad4s1e on /tmp (ufs, local, soft-updates)
/dev/ad4s1f on /usr (ufs, local, soft-updates)
/dev/ad4s1d on /var (ufs, local, 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 
  mount /dev/ad8 /a
  mkdir /a/1  /a/2
  cp -a /usr/src /a/1 &
  cp -a /usr/src /a/2 & 

And then wait 30 seconds to a minute.
I get a bunch of g_vfs_done():ad8[write(offset=146023743488,length=16384)]error=6

errors on the console and then the machine locks up entirely, keyboard and keyboard lights unresponsive.

I had looked for devclass_get_name
and found: http://www.freebsd.org/cgi/query-pr.cgi?pr=85728&cat=
but that is old and closed, from releng 6, 2007 timeframe.