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

[Eric Dumazet <eric.dumazet@gmail.com>]

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>


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