linux-kernel - Re: Kernel Oops while disconnecting USB peripheral (always)

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Message-ID: <CAP2rAF_K8Zg=+ahi23U34nb+Hewh+Xaa64jfQxBxOegN3=AnyA@mail.gmail.com>
Date:	Mon, 23 Jul 2012 20:34:46 +0530
From:	Sarbojit Ganguly <unixman.linuxboy@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	Daniel Mack <zonque@...il.com>, gregkh@...uxfoundation.org,
	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
	Takashi Iwai <tiwai@...e.de>
Subject: Re: Kernel Oops while disconnecting USB peripheral (always)

On 23 July 2012 20:17, Alan Stern <stern@...land.harvard.edu> wrote:
> On Mon, 23 Jul 2012, Sarbojit Ganguly wrote:
>
>> Hello Daniel,
>>
>> That is why I provided two stacks,
>>
>> 1st one is when I tried to remove the USB hub (which connects a webcam
>> + microphone)
>> 2nd one is when I tried to remove an USB powered external HDD.
>>
>> Just to make sure whether the problem is with USB sound or the USB subsystem.
>
> Do you stop all the programs that are using the USB devices before
> unplugging the hub?  Do you unmount the USB HDD first?

Yes Alan, I did unmount the HDD

>
> The first crash shows a problem in the snd-usb-audio driver.
>
> The second crash shows a problem in the VFS layer or in ext3, not in
> the USB stack.

Yes the issue is in evict() api which gets called when USB disconnect
is triggered.
>
> Alan Stern
>

Even I was confused in the beginning but after thorough check I
confirmed its presence. I reverted back to my distro's stock kernel
(3.2.0-26-generic) where the issue does not recur.

I could not analysed further (due to my limited knowledge of USB).



-- 
Regards,
Sarbojit
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