From owner-freebsd-usb@FreeBSD.ORG  Mon Jun 11 16:57:51 2012
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From: Hans Petter Selasky <hselasky@c2i.net>
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Date: Mon, 11 Jun 2012 18:57:12 +0200
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Cc: freebsd-gnats-submit@freebsd.org, freebsd-usb@freebsd.org
Subject: usb/168743: panic: double fault caused by umass
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Hi,

This sounds like a missing MODULE_DEPEND() issue or your pendrive is returning 
an error code to some of the SCSI commands which is not handled properly.


Could you add these options to the kernel config file:

options         KDB                     # Kernel debugger related code
options         KDB_TRACE               # Print a stack trace for a panic

Then get full backtrace.

Is this issue reproducable. I cannot reproduce over here using a 9-stable 
GENERIC kernel without "device umass".

--HPS