linux-kernel - Re: [PATCH net-next] rhashtable: Lower/upper bucket may map to same lock while shrinking

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Message-Id: <20150113.002539.865888654705925013.davem@davemloft.net>
Date:	Tue, 13 Jan 2015 00:25:39 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	tgraf@...g.ch
Cc:	fengguang.wu@...el.com, lkp@...org, linux-kernel@...r.kernel.org,
	netfilter-devel@...r.kernel.org, coreteam@...filter.org,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] rhashtable: Lower/upper bucket may map to
 same lock while shrinking

From: Thomas Graf <tgraf@...g.ch>
Date: Mon, 12 Jan 2015 23:58:21 +0000

> Each per bucket lock covers a configurable number of buckets. While
> shrinking, two buckets in the old table contain entries for a single
> bucket in the new table. We need to lock down both while linking.
> Check if they are protected by different locks to avoid a recursive
> lock.
> 
> Fixes: 97defe1e ("rhashtable: Per bucket locks & deferred expansion/shrinking")
> Reported-by: Fengguang Wu <fengguang.wu@...el.com>
> Signed-off-by: Thomas Graf <tgraf@...g.ch>

Applied.
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