linux-kernel - Re: [2.6.24 REGRESSION] BUG: Soft lockup

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Message-Id: <20080205140506.c6354490.akpm@linux-foundation.org>
Date:	Tue, 5 Feb 2008 14:05:06 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	"Oliver Pinter" <oliver.pntr@...il.com>
Cc:	"Linux Kernel" <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
	linux-fsdevel@...r.kernel.org, "James Morris" <jmorris@...ei.org>,
	linux-usb@...r.kernel.org, Pete Zaitcev <zaitcev@...hat.com>
Subject: Re: [2.6.24 REGRESSION] BUG: Soft lockup - with VFS

On Tue, 5 Feb 2008 22:48:29 +0100
"Oliver Pinter" <oliver.pntr@...il.com> wrote:

> On 2/5/08, Oliver Pinter <oliver.pntr@...il.com> wrote:
> > http://students.zipernowsky.hu/~oliverp/kernel/regression_2624/
> >
> > uploaded:
> > kernel image
> > .config
> > new pictures
> > lspci
> > lsusb
> >
> > -----
> >
> > when read for /dev/uba then crashed the kernel, the read is egal, thet
> > dd or mount is ...

Looks like you deadlocked in ub_request_fn().  I assume that you were using
ub.c in 2.6.23 and that it worked OK?  If so, we broke it, possibly via
changes to the core block layer.

I think ub.c is basically abandoned in favour of usb-storage.  If so,
perhaps we should remove or disble ub.c?
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