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

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Message-ID: <alpine.DEB.1.10.0810201121090.4791@p34.internal.lan>
Date:	Mon, 20 Oct 2008 11:21:48 -0400 (EDT)
From:	Justin Piszcz <jpiszcz@...idpixels.com>
To:	Alan Stern <stern@...land.harvard.edu>
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 Mon, 20 Oct 2008, Alan Stern wrote:

> 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
>

You're right, I set it to 128 KiB and here is the full log, including the 
initial dmesg:

http://home.comcast.net/~jpiszcz/20081019/kern.log

Justin.
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