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Date:   Wed, 13 May 2020 21:52:50 +1000
From:   Stephen Rothwell <sfr@canb.auug.org.au>
To:     madhuparnabhowmik10@gmail.com
Cc:     davem@davemloft.net, kuznet@ms2.inr.ac.ru, yoshfuji@linux-ipv6.org,
        kuba@kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org, frextrite@gmail.com,
        joel@joelfernandes.org, paulmck@kernel.org, cai@lca.pw
Subject: Re: [PATCH] Fix suspicious RCU usage warning
Message-ID: <20200513215250.43486e02@canb.auug.org.au>
In-Reply-To: <20200513061610.22313-1-madhuparnabhowmik10@gmail.com>
References: <20200513061610.22313-1-madhuparnabhowmik10@gmail.com>
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Hi all,

On Wed, 13 May 2020 11:46:10 +0530 madhuparnabhowmik10@gmail.com wrote:
>
> From: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>
>=20
> This patch fixes the following warning:
>=20
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D
> WARNING: suspicious RCU usage
> 5.7.0-rc4-next-20200507-syzkaller #0 Not tainted
> -----------------------------
> net/ipv6/ip6mr.c:124 RCU-list traversed in non-reader section!!
>=20
> ipmr_new_table() returns an existing table, but there is no table at
> init. Therefore the condition: either holding rtnl or the list is empty
> is used.
>=20
> Suggested-by: Jakub Kicinski <kuba@kernel.org>
> Signed-off-by: Madhuparna Bhowmik <madhuparnabhowmik10@gmail.com>

Thanks.  Added to my fixes tree from tomorrow (until it turns up
elsewhere).

--=20
Cheers,
Stephen Rothwell

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