From: Ido Schimmel <idosch@nvidia.com>
To: 马云龙 <yunlong_ma@buaa.edu.cn>
Cc: razor@blackwall.org, bridge@lists.linux.dev, netdev@vger.kernel.org
Subject: Re: [BUG] net: bridge: mcast: rejected report leaves an orphan MDB entry that can disable snooping
Date: Wed, 14 Oct 2026 17:45:59 +0300 [thread overview]
Message-ID: <20261014144559.GA1445548@shredder> (raw)
In-Reply-To: <2f5b61e2.1e71a.1a11fcb3809.Coremail.yunlong_ma@buaa.edu.cn>
On Fri, Oct 09, 2026 at 04:32:54PM +0800, 马云龙 wrote:
> Hi Nikolay, Ido,
>
> When __br_multicast_add_group() creates a new MDB entry and then fails
> to create the port group, the new entry is left in the MDB hash table
> with no ports, host_joined == false and mp->timer never armed. Nothing
> ever removes it, but it still counts towards hash_max. With
> mcast_max_groups set on a port, a host behind that port can create
> these entries at will by sending IGMP/MLD reports for new groups, and
> once the table reaches hash_max the bridge turns multicast snooping
> off.
Thanks for the report. I will send a fix.
prev parent reply other threads:[~2026-10-14 14:46 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-10-09 8:32 [BUG] net: bridge: mcast: rejected report leaves an orphan MDB entry that can disable snooping 马云龙
2026-10-14 14:45 ` Ido Schimmel [this message]
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