linux-kernel - Re: Linux 3.0 oopses when pulling a USB CDROM

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Date:	Fri, 01 Jul 2011 15:29:08 -0500
From:	James Bottomley <James.Bottomley@...senPartnership.com>
To:	Dave Jones <davej@...hat.com>
Cc:	Andi Kleen <andi@...stfloor.org>, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org, axboe@...nel.dk, rjw@...k.pl,
	linux-usb@...r.kernel.org
Subject: Re: Linux 3.0 oopses when pulling a USB CDROM

On Fri, 2011-07-01 at 14:14 -0400, Dave Jones wrote:
> On Fri, Jul 01, 2011 at 10:05:31AM -0700, Andi Kleen wrote:
> 
>  > I found I can reliably crash a 3.0 system by pulling the
>  > USB cable of a mounted USB cdrom (or rather a USB device which
>  > has a builtin fake CD-ROM) 
>  > 
>  > I suspect it's a regression too.
> 
> We've been seeing a lot of similar bugs in Fedora since we pushed
> a 2.6.38.8 update.  Some of the traces are different, but some
> look to be the same as yours. (here's one for eg: https://bugzilla.redhat.com/show_bug.cgi?id=712830)
> 
> The common cause seems to be 'device went away'. So USB CD drives,
> USB memory sticks, and for some reason virtualbox shutdown.

I think it's something specific in the USB path.  I can't reproduce on
3.0-rc5 with a SATA DVD hot unplug.  USB cc's added.

James


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