netdev - Re: [BUG] Network regression on Linux 6.16.1 -> 6.16.2 (persists in 6.16.3): intermittent IPv4 traffic on Wi-Fi and Ethernet

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Message-ID: <CAF4aUutwOusxj_UGJzNo53Z4DFSKe8O6npxx40gEiKMKY8_JDw@mail.gmail.com>
Date: Wed, 27 Aug 2025 16:11:11 +0200
From: Luis Alberto <albersc2@...il.com>
To: Eric Dumazet <eric.dumazet@...il.com>
Cc: netdev@...r.kernel.org
Subject: Re: [BUG] Network regression on Linux 6.16.1 -> 6.16.2 (persists in
 6.16.3): intermittent IPv4 traffic on Wi-Fi and Ethernet

Hi,
Thanks for your reply and suggestions. The proposed fix didn’t solve my issue.

I’ve been running more tests and noticed something interesting:

Recent Kernels that work fine (issue solved, internet working perfectly):

6.16.3-201.nobara.fc42.x86_64
6.16.3-2-cachyos
6.12.43-3.1-cachyos-lts

Kernels that still show the problem (internet working very poorly):

6.16.3-arch1-1
6.12.43-1-lts

So it looks like some recent kernels (Nobara, CachyOS) already include
a patch that fixes the issue.
Could someone point me to which commit might be responsible for this
fix? That would help me apply it on Arch Linux as well.

Thanks a lot for your help

El mar, 26 ago 2025 a las 20:12, Eric Dumazet
(<eric.dumazet@...il.com>) escribió:
>
>
> On 8/26/25 10:59 AM, Luis Alberto wrote:
> > Hi everyone, I’m new to this mailing list.
> >
> > I am reporting a network regression observed on my system when
> > upgrading from Linux kernel 6.16.1 to 6.16.2 (and persisting in
> > 6.16.3). The issue affects both Wi-Fi and Ethernet interfaces and
> > seems to originate in the kernel networking stack rather than any
> > specific driver.
> >
> > For reference, I initially reported this issue on Bugzilla, ID 220484,
> > thinking it was exclusively a Wi-Fi problem.
> > Subsequent testing with a wired Ethernet connection confirmed that the
> > issue affects both interfaces.
> >
> > System / hardware information:
> > - Motherboard: Asus TUF GAMING B460M-PLUS (WI-FI)
> > - CPU: Intel i5-10400
> > - 16GB RAM
> > - GPU: NVIDIA 4060 (proprietary open module drivers installed v580)
> > - Wi-Fi: Intel AX200, driver: iwlwifi + mac80211
> > - Ethernet: Intel I219-V, driver: e1000e
> > - Connections use IPv4
> >
> > Kernel versions tested:
> >    6.15.7, 6.15.8 and 6.16.1 (works fine)
> >    6.16.2 and 6.16.3 (regression present)
> >    LTS 6.12.43 from Aug 20 (regression present)
> >
> > Symptoms:
> > - Internet connectivity is intermittent: when opening multiple
> > websites simultaneously (e.g., 10 pages), roughly 1/4 fail to load.
> > - Failed pages either remain completely blank with a connection error
> > or load partially; both situations occur frequently.
> > - The issue also occurs occasionally with a single webpage, or when
> > downloading system updates, not limited to the browser.
> > - Occurs on both Wi-Fi and wired Ethernet.
> > - No connection drops; the interface remains "up".
> > - Tested in more than one distro: EndeavourOS and Nobara, vanilla installations.
> > - Ping comparison:
> >    6.16.2+: Running ping google.com while opening 10 webpages
> > successively results in >10% packet loss and several pages failing to
> > load.
> >    6.16.1: 0% packet loss and all pages load correctly on first
> > attempt, consistently.
> >
> > Actions taken:
> > - Opened a Bugzilla report, ID 220484, including dmesg, journal, and
> > tcpdump logs.
> > - Tested with both Wi-Fi and Ethernet; issue persists on both.
> > - Verified IPv4 usage; IPv6 is link-local only.
> > - Tested repeatedly on kernel 6.16.1 and earlier: everything works perfectly.
> >
> > Reproduction steps:
> > 1. Boot kernel 6.16.2 or 6.16.3
> > 2. Connect via Wi-Fi or Ethernet
> > 3. Attempt to load multiple websites
> > 4. Observe inconsistent traffic and intermittent failures
> >
> > Any help is much appreciated.
> >
> > Could anyone advise which commits between 6.16.1 and 6.16.2 might have
> > introduced this behavior, or suggest any testing and further steps?
> >
> > Thank you very much.
> >
> > Best regards,
> > Luis Alberto
>
>
> Please try :
> https://lore.kernel.org/all/20250821105806.1453833-1-wangzijie1@honor.com
> <https://lore.kernel.org/all/20250821105806.1453833-1-wangzijie1@honor.com>
>
>
> >