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

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Date:	Tue, 05 Jun 2012 19:59:10 +0400
From:	Konstantin Khlebnikov <khlebnikov@...nvz.org>
To:	OGAWA Hirofumi <hirofumi@...l.parknet.co.jp>
CC:	Ondrej Zary <linux@...nbow-software.org>,
	Hugh Dickins <hughd@...gle.com>,
	Kernel development list <linux-kernel@...r.kernel.org>,
	Dave Jones <davej@...hat.com>,
	Hans de Bruin <jmdebruin@...net.nl>,
	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

Proper fix in attachment.

Konstantin Khlebnikov wrote:
> OGAWA Hirofumi wrote:
>> Konstantin Khlebnikov<khlebnikov@...nvz.org>   writes:
>>
>>> Hmm, very interesting!
>>> Please try this patch, it must fix the problem and print some numbers to debug.
>>>
>>
>> I think the bug is in radix_tree_for_each_contig().
>>
>> radix_tree_next_slot() returns NULL if the slot was NULL (i.e. there is
>> hole). But, slot == NULL is not meaning to stop iterate here. Actually,
>> if slot is NULL, it gets next chunk.
>>
>> Bang.
>
> Yeah, you are right, I already found this too.
> Currently I think how to fix this more accurately...
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View attachment "radix-tree-fix-contiguous-iterator" of type "text/plain" (1869 bytes)