Re: [PATCH net-next v2 1/2] ipv6: mcast: annotate data-races around mca_flags

[Ido Schimmel]

On Tue, Jun 09, 2026 at 05:11:12PM +0900, Yuyang Huang wrote:
> /proc/net/igmp6 walks IPv6 multicast memberships under RCU and
> prints mca_flags without holding idev->mc_lock. The multicast paths
> update the field while holding idev->mc_lock.
> 
> Annotate this intentional lockless snapshot with READ_ONCE() and the
> matching writers with WRITE_ONCE().
> 
> Signed-off-by: Yuyang Huang <sigefriedhyy@xxxxxxxxx>

Reviewed-by: Ido Schimmel <idosch@xxxxxxxxxx>