linux-kernel - Re: crash by cdc_acm driver in kernels 4.8-rc1/5

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Date:   Wed, 28 Sep 2016 17:23:30 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     wim@....tudelft.nl
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Subject: Re: crash by cdc_acm driver in kernels 4.8-rc1/5

On Wed, 2016-09-28 at 17:08 +0200, Wim Osterholt wrote:
> On Wed, Sep 28, 2016 at 11:16:04AM +0200, Oliver Neukum wrote:
> > this should show you where it crashes. In addition I've attached
> > a patch with paranoid debugging. Could you compile and test a kernel
> > with it?
> > 
> > 	Regards
> > 		Oliver
> 
> If you mean
>   echo "module cdc_acm +mpf" > /sys/kernel/debug/dynamic_debug/control
> etc, then it will take some time because I don't have the cabling not
> available now for a serial dump.
> 
> Just 4.8-rc8 with the patched modules gave an oops of less than one screen
> while the machine stayed responsive long enough to grab it with the mouse
> and put it in a file:
> 
> HP src # sync
> HP src # [ 3744.914184] BUG: unable to handle kernel NULL pointer dereference at 00000249

The last view lines before that please with the debugging level ramped
up to 9 please.

	Regards
		Oliver