usb/168743: panic: double fault caused by umass

[FreeBSD at nagilum.org]

The following reply was made to PR usb/168743; it has been noted by GNATS.

From: FreeBSD at nagilum.org
To: Hans Petter Selasky <hselasky at c2i.net>
Cc: freebsd-usb at freebsd.org, freebsd-gnats-submit at freebsd.org
Subject: Re: usb/168743: panic: double fault caused by umass
Date: Mon, 11 Jun 2012 19:53:51 +0200

 I'm compiling a new kernel with those options as I type. Yes, this is  
 very much reproduceable. If you look at the dmesg you will also see  
 the previous reboot for the same reason but with a different device -  
 a WLAN stick that also includes some mass storage for the windows  
 driver and probably another for the mini-sd or whatever card fits in  
 there..
 The Pendrive I then used is a 64MB (yes, megabytes) so from that you  
 can probably guess how ancient that thing is so it should not have any  
 new and fancy options aka quirks ;).
 What I haven't tried yet is simply loading the module while no device  
 is attached.
 I'll try that when I have the new kernel booted. It will take some  
 time though since this is a 500MHz Geode..
 I think I also saw a few other bugreports related to this issue maybe  
 someone else already included a backtrace.
 Thanks for looking into this,
 Alex.
 
 
 Zitat von Hans Petter Selasky <hselasky at c2i.net>:
 
 > 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