linux-kernel - Re: Kernel 2.6.26.5 -> 2.6.27.2 [USB REGRESSION] (USB -> D

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Date:	Mon, 20 Oct 2008 10:02:25 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	Justin Piszcz <jpiszcz@...idpixels.com>
cc:	Oliver Neukum <oliver@...kum.org>, <linux-kernel@...r.kernel.org>,
	<linux-usb@...r.kernel.org>
Subject: Re: Kernel 2.6.26.5 -> 2.6.27.2 [USB REGRESSION] (USB -> D_STATE)

On Sun, 19 Oct 2008, Justin Piszcz wrote:

> > You should turn on the usbfs_snoop module parameter for usbcore and see
> > what shows up in the system log.
> 
> > Alan Stern
> 
> Tried this, kernel would not boot up any further when I had that enabled
> alongside the 'extra' debugging options in the kernel:
> 
> http://home.comcast.net/~jpiszcz/20081019/2.6.27.2-usb-extra-debug.txt

I'm not interested in your config file; I need to see the dmesg log.

> > Please get sysrq-t of a hang.
> >
> > 	Regards
> > 		Oliver
> >
> 
> Before I tried the above, I was able to get a sysrq-t of the hang:
> 
> http://home.comcast.net/~jpiszcz/20081019/trace_before_trigger.txt
> http://home.comcast.net/~jpiszcz/20081019/trace_after_trigger.txt

Your trace is incomplete.  You might need to increase the size of the 
kernel log buffer (CONFIG_LOG_BUF_SHIFT) or the size of the buffer used 
by dmesg (the -s option).

Alan Stern

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