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

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Date:	Mon, 23 Jul 2012 16:54:22 +0200
From:	Daniel Mack <zonque@...il.com>
To:	Alan Stern <stern@...land.harvard.edu>
CC:	Sarbojit Ganguly <unixman.linuxboy@...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 23.07.2012 16:47, Alan Stern wrote:
> On Mon, 23 Jul 2012, Sarbojit Ganguly wrote:
>> 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?
> 
> 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.

I dare to doubt there are two severe bugs of that kind that are 100%
reproducible. I haven't had a  hotplug crash in any of the two drivers
for a long time, and I use both of them extensively.

I rather assume there's something else failing, probably some host
controller issue that corrupts mempory? Can anyone else reproduce this
maybe?



Daniel

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