From: Jiayuan Chen <jiayuan.chen@linux.dev>
To: Yuyang Huang <sigefriedhyy@gmail.com>
Cc: Jiayuan Chen <jiayuan.chen@linux.dev>,
"David S. Miller" <davem@davemloft.net>,
David Ahern <dsahern@kernel.org>,
Eric Dumazet <edumazet@google.com>,
Ido Schimmel <idosch@nvidia.com>,
Jakub Kicinski <kuba@kernel.org>, Paolo Abeni <pabeni@redhat.com>,
Simon Horman <horms@kernel.org>,
linux-kernel@vger.kernel.org, netdev@vger.kernel.org
Subject: Re: [PATCH net-next v2] ipv4: igmp: annotate data-races around im->users
Date: Fri, 22 May 2026 18:38:12 +0800 [thread overview]
Message-ID: <186b4a77-3e34-4a87-9910-a9c5a756c766@linux.dev> (raw)
In-Reply-To: <20260522093906.39764-1-sigefriedhyy@gmail.com>
On 5/22/26 5:39 PM, Yuyang Huang wrote:
> /proc/net/igmp walks IPv4 multicast memberships under RCU and
> prints im->users without holding RTNL, while multicast join and leave
> paths update the field while holding RTNL. Annotate this intentional
> lockless snapshot with READ_ONCE() and the matching writers with
> WRITE_ONCE().
>
> Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
> Signed-off-by: Yuyang Huang <sigefriedhyy@gmail.com>
Reviewed-by: Jiayuan Chen <jiayuan.chen@linux.dev>
next prev parent reply other threads:[~2026-05-22 10:38 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-05-22 9:39 [PATCH net-next v2] ipv4: igmp: annotate data-races around im->users Yuyang Huang
2026-05-22 10:38 ` Jiayuan Chen [this message]
2026-05-22 11:07 ` Eric Dumazet
2026-05-24 13:59 ` Ido Schimmel
2026-05-24 14:05 ` Yuyang Huang
2026-05-25 14:02 ` Ido Schimmel
2026-05-25 18:30 ` patchwork-bot+netdevbpf
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