freebsd stable - Oct 2011 - panic: umass1: Unknown state 1

I just got this panic on a recent stable/8 amd/64 system:
panic: umass1: Unknown state 1

Here's a screen shot from the KVM console:

http://www.secnetix.de/olli/tmp/umass-panic.jpg

Unfortunately, the crash dump that was written seems to be
lost.  A quick search on the PRs doesn't reveal anything
either ...  has anyone seen this type of panic before?

It happened when I was switching virtual remote drives in
the management application of an IBM blade center, i.e.
the USB drive is actually a virtual drive emulated by the
blade management system.  I did similar things a few times
before without a panic, so this isn't 100% reproducable.
Also, I'm reluctant to try again because this is a quite
important production server.

Best regards
   Oliver


-- 
Oliver Fromme, secnetix GmbH & Co. KG, Marktplatz 29, 85567 Grafing b. M.
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chen, HRB 125758,  Gesch?ftsf?hrer: Maik Bachmann, Olaf Erb, Ralf Gebhart

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"Whatever happened to the days when hacking started
at the cerebral cortex, and not at the keyboard?"
  --  Sid on userfriendly.org by Illiad, 2007-06-20

On Thursday 13 October 2011 20:06:34 Oliver Fromme
wrote:
> I just got this panic on a recent stable/8 amd/64 system:
> panic: umass1: Unknown state 1
> 
> Here's a screen shot from the KVM console:
> 
> http://www.secnetix.de/olli/tmp/umass-panic.jpg
> 
> Unfortunately, the crash dump that was written seems to be
> lost.  A quick search on the PRs doesn't reveal anything
> either ...  has anyone seen this type of panic before?
> 
> It happened when I was switching virtual remote drives in
> the management application of an IBM blade center, i.e.
> the USB drive is actually a virtual drive emulated by the
> blade management system.  I did similar things a few times
> before without a panic, so this isn't 100% reproducable.
> Also, I'm reluctant to try again because this is a quite
> important production server.
> 
Hi,

ehci_softintr() is not part of the USB stack in 8-stable and 9-stable. Must be 
7-stable you are running.

--HPS