linux-kernel - Re: [PATCH v2] rhashtable: fix for resize events during table walk

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Message-ID: <20150706135353.GA22998@gondor.apana.org.au>
Date:	Mon, 6 Jul 2015 21:53:54 +0800
From:	Herbert Xu <herbert@...dor.apana.org.au>
To:	Phil Sutter <phil@....cc>
Cc:	Thomas Graf <tgraf@...g.ch>, sparclinux@...r.kernel.org,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	davem@...emloft.net, daniel@...earbox.net, geert@...ux-m68k.org,
	mroos@...ux.ee
Subject: Re: [PATCH v2] rhashtable: fix for resize events during table walk

On Mon, Jul 06, 2015 at 03:51:20PM +0200, Phil Sutter wrote:
> If rhashtable_walk_next detects a resize operation in progress, it jumps
> to the new table and continues walking that one. But it misses to drop
> the reference to it's current item, leading it to continue traversing
> the new table's bucket in which the current item is sorted into, and
> after reaching that bucket's end continues traversing the new table's
> second bucket instead of the first one, thereby potentially missing
> items.
> 
> This fixes the rhashtable runtime test for me. Bug probably introduced
> by Herbert Xu's patch eddee5ba ("rhashtable: Fix walker behaviour during
> rehash") although not explicitly tested.
> 
> Fixes: eddee5ba ("rhashtable: Fix walker behaviour during rehash")
> Signed-off-by: Phil Sutter <phil@....cc>

Acked-by: Herbert Xu <herbert@...dor.apana.org.au>
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Email: Herbert Xu <herbert@...dor.apana.org.au>
Home Page: http://gondor.apana.org.au/~herbert/
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