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]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20261014144559.GA1445548@shredder \
--to=idosch@nvidia.com \
--cc=bridge@lists.linux.dev \
--cc=netdev@vger.kernel.org \
--cc=razor@blackwall.org \
--cc=yunlong_ma@buaa.edu.cn \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.