linux-kernel - Re: net: lockdep warning in ip_mc

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Message-ID: <CAHA+R7OsGmYPWtHFK8QmuzaZW9WBfVCVviReEopTRF_zjxzKKA@mail.gmail.com>
Date:	Mon, 2 Nov 2015 16:38:16 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>, syzkaller@...glegroups.com,
	Dmitry Vyukov <dvyukov@...gle.com>, marcelo.leitner@...il.com
Subject: Re: net: lockdep warning in ip_mc_msfget (net/ipv4/igmp.c:2400)

On Mon, Nov 2, 2015 at 1:31 PM, Cong Wang <cwang@...pensource.com> wrote:
>
> Good catch!
>
> This is probably introduced by:
>
> commit baf606d9c9b12517e47e0d1370e8aa9f7323f210
> Author: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>
> Date:   Wed Mar 18 14:50:42 2015 -0300
>
>     ipv4,ipv6: grab rtnl before locking the socket
>
> I am thinking what is the right way to fix it...

Please try the attached patch.

Thanks!

View attachment "tmp.patch" of type "text/x-patch" (4066 bytes)