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Date:      Mon, 11 Jun 2012 18:57:12 +0200
From:      Hans Petter Selasky <hselasky@c2i.net>
To:        freebsd@nagilum.org
Cc:        freebsd-gnats-submit@freebsd.org, freebsd-usb@freebsd.org
Subject:   usb/168743: panic: double fault caused by umass
Message-ID:  <201206111857.12147.hselasky@c2i.net>
In-Reply-To: <201105281635.57055.hselasky@c2i.net>
References:  <201105280113.p4S1DWgM081572@red.freebsd.org> <alpine.BSF.2.00.1105281024440.18707@joyce.lan> <201105281635.57055.hselasky@c2i.net>

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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



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