linux-kernel - Re: kernel BUG at lib/radix-tree.c:473!

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Date:	Mon, 18 Aug 2008 04:22:20 -0400
From:	"Jaya Kumar" <jayakumar.lkml@...il.com>
To:	"Ian Campbell" <ijc@...lion.org.uk>
Cc:	"Nick Piggin" <nickpiggin@...oo.com.au>,
	"Hugh Dickins" <hugh@...itas.com>,
	"Johannes Weiner" <hannes@...urebad.de>,
	"Jeremy Fitzhardinge" <jeremy@...p.org>,
	linux-kernel@...r.kernel.org, "Kel Modderman" <kel@...ku42.de>,
	"Markus Armbruster" <armbru@...hat.com>,
	"Peter Zijlstra" <a.p.zijlstra@...llo.nl>
Subject: Re: kernel BUG at lib/radix-tree.c:473!

On Mon, Aug 18, 2008 at 3:54 AM, Ian Campbell <ijc@...lion.org.uk> wrote:
> On Mon, 2008-08-18 at 11:32 +1000, Nick Piggin wrote:
>> On Monday 18 August 2008 02:19, Ian Campbell wrote:
>> > FWIW the patch below apparently makes it work for me, but I'm not going
>> > to pretend I follow what's going on, why or what else it breaks ;-)
>>
>> I think Iwould prefer fs_defio to use its own set_page_dirty
>> function. __set_page_dirty_no_writeback is supposed to be used
>> on pagecache, by filesystems.
>
> fbdefio: add set_page_dirty handler to deferred IO FB
>
> Fixes kernel BUG at lib/radix-tree.c:473.
>
> Previously the handler was incidentally provided by tmpfs but this was
> removed with:
>
>  commit 14fcc23fdc78e9d32372553ccf21758a9bd56fa1
>  Author: Hugh Dickins <hugh@...itas.com>
>  Date:   Mon Jul 28 15:46:19 2008 -0700
>
>    tmpfs: fix kernel BUG in shmem_delete_inode
>
> relying on this behaviour was incorrect in any case and the BUG
> also appeared when the device node was on an ext3 filesystem.
>
> Signed-off-by: Ian Campbell <ijc@...lion.org.uk>
> Cc: Jaya Kumar <jayakumar.lkml@...il.com>
> Cc: Nick Piggin <nickpiggin@...oo.com.au>
> Cc: Hugh Dickins <hugh@...itas.com>
> Cc: Johannes Weiner <hannes@...urebad.de>
> Cc: Jeremy Fitzhardinge <jeremy@...p.org>
> Cc: Kel Modderman <kel@...ku42.de>
> Cc: Markus Armbruster <armbru@...hat.com>
> Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>

Acked-by: Jaya Kumar <jayakumar.lkml@...il.com>

Thanks,
jaya
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