linux-kernel - Re: [bisected commit 0fc9d10] NFS-server corruption with 3.4

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Date:	Wed, 06 Jun 2012 00:30:39 +0200
From:	Hans de Bruin <jmdebruin@...net.nl>
To:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
CC:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>,
	Ondrej Zary <linux@...nbow-software.org>,
	Hugh Dickins <hughd@...gle.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Linux NFS mailing list <linux-nfs@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Toralf Förster 
	<toralf.foerster@....de>,
	richard -rw- weinberger <richard.weinberger@...il.com>
Subject: Re: [bisected commit 0fc9d10] NFS-server corruption with 3.4

On 06/05/2012 06:39 PM, Konstantin Khlebnikov wrote:
> OGAWA Hirofumi wrote:
>> Konstantin Khlebnikov<khlebnikov@...nvz.org> writes:
>>
>>> Proper fix in attachment.
>>
>> Maybe, you are going to add the stable tag for next stable?
>>
>> Thanks.
>
> Yes, this definitely must be in next stable 3.4.x , but first I'll wait
> for confirmation.
>
> Guys, who can reproduce this, please check patch "radix-tree: fix
> contiguous iterator"
> from my previous mail in this thread.
>
>>
>>> radix-tree: fix contiguous iterator
>>>
>>> From: Konstantin Khlebnikov<khlebnikov@...nvz.org>
>>>
>>> This patch fixes bug in macro radix_tree_for_each_contig().
>>> If radix_tree_next_slot() sees NULL in next slot it returns NULL, but
>>> following
>>> radix_tree_next_chunk() switches iterating into next chunk. As result
>>> iterating
>>> becomes non-contiguous and breaks vfs "splice" and all its users.
>>
>

I patched on to off v3.4 and Firefox an Thunderbird do not segfault 
anymore. The do not start either. This was de feature on my 'production' 
server I could not reproduce on my test server. Maybe it has something 
to with the different type of nic's.

For the second attempt I branched of at 0fc9d1040313047edf6a39fd and 
applied your patch on top of it. Firefox an Thunderbird where back 
again. So your patch works.

Now I need some git-instructions. Apparently something else is broken. I 
branched of with:

git branch debug 0fc9d1040313047edf6a3
git checkout debug
applied the patch.
git commit -a (got commit 5c09c685ba2d36c3b905220d43ad1b47354e456eed back)

Now I want all commits in my master branch up until ref v3.4 added to my 
debug branch so I can bisect between 5c09 and v3.4

-- 
Hans









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