Re: Kernel Oops while disconnecting USB peripheral (always)

From: Sarbojit Ganguly
Date: Mon Jul 23 2012 - 11:04:42 EST

On 23 July 2012 20:17, Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> 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).

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