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Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , 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 Message-ID: References: <20260719232153.1405569-1-xmei5@asu.edu> <2820549.1784570299@famine> Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline In-Reply-To: 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