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Miller" , David Ahern , Eric Dumazet , Ido Schimmel , Jakub Kicinski , Paolo Abeni , Simon Horman , linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: [PATCH net-next v2 0/2] ipv6: mcast: annotate data races in /proc/net/igmp6 Date: Tue, 9 Jun 2026 17:11:11 +0900 Message-ID: <20260609081113.7613-1-sigefriedhyy@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit /proc/net/igmp6 walks IPv6 multicast memberships under RCU without holding idev->mc_lock, taking a lockless snapshot of two fields that writers update under the lock: mca_flags and mca_work.timer.expires. Patch 1 adds WRITE_ONCE() to all mca_flags update sites and READ_ONCE() to the procfs reader. Patch 2 does the same for the timer.expires read in the procfs path. Changes in v2: - patch 2: read mca_flags before timer.expires to match write-side ordering and avoid printing a garbage timer value. Yuyang Huang (2): ipv6: mcast: annotate data-races around mca_flags ipv6: mcast: annotate igmp6 timer expiry race net/ipv6/mcast.c | 55 ++++++++++++++++++++++++++++++------------------ 1 file changed, 34 insertions(+), 21 deletions(-) -- 2.43.0