netdev - Re: [BUG] 6.14: WARNING: CPU: 0 PID: 478 at net/bridge/br_vlan.c:433 nbp_vlan

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Message-ID: <20250411184902.ajifatz3dmx6cqar@skbuf>
Date: Fri, 11 Apr 2025 21:49:02 +0300
From: Vladimir Oltean <olteanv@...il.com>
To: "Russell King (Oracle)" <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org
Subject: Re: [BUG] 6.14: WARNING: CPU: 0 PID: 478 at net/bridge/br_vlan.c:433
 nbp_vlan_flush+0xc0/0xc4

On Fri, Apr 11, 2025 at 06:24:44PM +0100, Russell King (Oracle) wrote:
> Hi,
> 
> When executing:
> 
> # ifdown br0
> 
> on the ZII dev rev B platform with br0 being a bridge between mv88e6xxx
> DSA ports, the following was spewed:
> 
> [  628.418720] br0: port 9(optical2) failed to delete vlan 1: -ENOENT

(trimming the rest, which is just the bridge complaining that &vg->vlan_list
is not empty, but __vlan_del() aborted the VLAN deletion due to
br_switchdev_port_vlan_del() returning an error, and left the VLAN in
the VLAN group's list. So that part is expected and is just a symptom,
we should focus on why DSA returns -ENOENT when requesting to delete
VLAN 1 from the CPU port).

Please test the attached patch. This is more speculative, but I've run
all the options in my mind and this is the only thing that makes sense.

View attachment "0001-net-dsa-mv88e6xxx-fix-ENOENT-while-deleting-user-por.patch" of type "text/x-diff" (2060 bytes)