From: Hangbin Liu <liuhangbin@gmail.com>
To: Xiang Mei <xmei5@asu.edu>
Cc: Jay Vosburgh <jv@jvosburgh.net>,
Andrew Lunn <andrew+netdev@lunn.ch>,
"David S . Miller" <davem@davemloft.net>,
Eric Dumazet <edumazet@google.com>,
Jakub Kicinski <kuba@kernel.org>,
Paolo Abeni <pabeni@redhat.com>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
AutonomousCodeSecurity@microsoft.com,
tgopinath@linux.microsoft.com, kys@microsoft.com
Subject: Re: [PATCH net] bonding: fix skb_under_panic in bond_ns_send() over stacked VLANs
Date: Sat, 1 Aug 2026 07:57:41 +0800 [thread overview]
Message-ID: <am01LskdPIN8yU2C@fedora> (raw)
In-Reply-To: <amrIbBqpw9Ol5wPJ@fedora>
On 30.07.2026 11:50, Hangbin Liu wrote:
>Hi Xiang,
>
>On 29.07.2026 16:30, Xiang Mei wrote:
>>> Does adding one or two more nested VLANs move the panic into the
>>>above call path?
>>>
>>
>>No, for both of the reasons above: there is no room to add more
>>(-EMLINK at N = 7), and skb_cow_head() would absorb it if there were.
>
>What about the scenario that involves nested VLANs? For example:
>
>vlan.1 - vlan.1.2 ... vlan.1..6 - bond - bond.1 - bond.1.2 ... bond.1..6?
Oh, I just remember that the MAX_NEST_DEV is 8. So there could be only 1
VLAN slave with this topology.
Thanks
Hangbin
prev parent reply other threads:[~2026-07-31 23:57 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-19 23:21 [PATCH net] bonding: fix skb_under_panic in bond_ns_send() over stacked VLANs Xiang Mei (Microsoft)
2026-07-20 17:58 ` Jay Vosburgh
2026-07-29 23:30 ` Xiang Mei
2026-07-30 3:50 ` Hangbin Liu
2026-07-31 23:57 ` Hangbin Liu [this message]
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