Arch Linux

UrbenLegend

Member

Registered: 2021-03-26

Posts: 23

Avahi mDNS seems broken with kernel 6.14.3

I have Avahi setup with nss-mdns as described in the Avahi wiki. I am also using systemd-resolved with MulticastDNS disabled so that it doesn't conflict with Avahi. Before kernel 6.14.2, this setup worked quite well. I was able to ping and SSH my network devices via *.local. After installing kernel 6.14.3, I am no longer able to do so. Rolling back to kernel 6.14.2 makes it work again.

Anyone else seeing this on their end? I have no idea what changed in the kernel to cause this.

UrbenLegend

Member

Registered: 2021-03-26

Posts: 23

Re: Avahi mDNS seems broken with kernel 6.14.3

In case anyone else is running into this issue, I did a kernel bisection and the following commit is causing the issue:

commit 80007d3f92fd018d0a052a706400e976b36e3c87
Author: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
Date:   Tue Mar 4 16:08:50 2025 -0800

    wifi: mt76: mt7925: integrate *mlo_sta_cmd and *sta_cmd
    
    commit cb1353ef34735ec1e5d9efa1fe966f05ff1dc1e1 upstream.
    
    Integrate *mlo_sta_cmd and *sta_cmd for the MLO firmware.
    
    Fixes: 86c051f2c418 ("wifi: mt76: mt7925: enabling MLO when the firmware supports it")
    Cc: stable@vger.kernel.org
    Co-developed-by: Sean Wang <sean.wang@mediatek.com>
    Signed-off-by: Sean Wang <sean.wang@mediatek.com>
    Tested-by: Caleb Jorden <cjorden@gmail.com>
    Signed-off-by: Ming Yen Hsieh <mingyen.hsieh@mediatek.com>
    Link: https://patch.msgid.link/20250305000851.493671-5-sean.wang@kernel.org
    Signed-off-by: Felix Fietkau <nbd@nbd.name>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

 drivers/net/wireless/mediatek/mt76/mt7925/mcu.c | 59 ++++-------------------------------------------------------
 1 file changed, 4 insertions(+), 55 deletions(-)

It is specific to MT7925. Something funky is going on with mDNS and IPv6 on these wifi chips due to that commit. Already submitted to the kernel mailing lists.

ipb52

Member

Registered: 2025-04-28

Posts: 6

Re: Avahi mDNS seems broken with kernel 6.14.3

Same here, seems specific to MT7925, other card works fine. Everything besides avahi/mdns seems fine. Weird one.

UrbenLegend

Member

Registered: 2021-03-26

Posts: 23

Re: Avahi mDNS seems broken with kernel 6.14.3

Check your IPv6 as well. I've noticed the wifi card unable to grab a IPv6 address. No DHCP lease shows up router-side. If I swap to 6.14.2, it will immediately grab an IPv6 address again.

ggdG

Member

Registered: 2021-01-06

Posts: 2

Re: Avahi mDNS seems broken with kernel 6.14.3

Same here, MT7925 cannot get a IPv6 address after 6.14.3.

Last edited by ggdG (2025-05-02 10:00:30)