linux-kernel - Re: [PATCH] [RFC] udp: ipv4: fix potential deadlock on sk_dst

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Message-ID: <1387233731.19078.254.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 16 Dec 2013 14:42:11 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Jiri Kosina <jkosina@...e.cz>
Cc:	Eric Dumazet <edumazet@...gle.com>,
	Shawn Bohrer <sbohrer@...advisors.com>,
	"David S. Miller" <davem@...emloft.net>, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [RFC] udp: ipv4: fix potential deadlock on sk_dst_lock

On Mon, 2013-12-16 at 23:37 +0100, Jiri Kosina wrote:
> Commit 975022310 ("udp: ipv4: must add synchronization in 
> udp_sk_rx_dst_set()) caused sk_dst_lock to be obtained in udp4 receive 
> path, which is happening in softirq context.
> 
> inet_bind() is taking sk_dst_lock (through sk_dst_reset()) without turning 
> IRQs off, which results in the lockdep splat below.
> 
> Fix that by disabling IRQs while taking the lock in sk_dst_reset().



Thanks but I posted this fix instead :

 http://patchwork.ozlabs.org/patch/301382/




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