linux-kernel - Re: Fwd: Unexplainable packet drop starting at v6.4

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Message-ID: <4759e7d4-5a8c-8acb-1775-e049b9b06cc1@gmail.com>
Date:   Wed, 19 Jul 2023 19:30:46 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Thorsten Leemhuis <regressions@...mhuis.info>,
        Andrzej Kacprowski <andrzej.kacprowski@...ux.intel.com>,
        Krystian Pradzynski <krystian.pradzynski@...ux.intel.com>,
        Stanislaw Gruszka <stanislaw.gruszka@...ux.intel.com>,
        Jacek Lawrynowicz <jacek.lawrynowicz@...ux.intel.com>,
        Oded Gabbay <ogabbay@...nel.org>,
        Jesse Brandeburg <jesse.brandeburg@...el.com>,
        Tony Nguyen <anthony.l.nguyen@...el.com>,
        "David S. Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>, hq.dev+kernel@...fc.xyz
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux DRI Development <dri-devel@...ts.freedesktop.org>,
        Linux Networking <netdev@...r.kernel.org>,
        Linux Intel Ethernet Drivers 
        <intel-wired-lan@...ts.osuosl.org>
Subject: Re: Fwd: Unexplainable packet drop starting at v6.4

On 7/19/23 18:49, Thorsten Leemhuis wrote:
> On 18.07.23 02:51, Bagas Sanjaya wrote:
>>
>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>
>>> After I updated to 6.4 through Archlinux kernel update, suddenly I noticed random packet losses on my routers like nodes. I have these networking relevant config on my nodes
>>>
>>> 1. Using archlinux
>>> 2. Network config through systemd-networkd
>>> 3. Using bird2 for BGP routing, but not relevant to this bug.
>>> 4. Using nftables for traffic control, but seems not relevant to this bug. 
>>> 5. Not using fail2ban like dymanic filtering tools, at least at L3/L4 level
>>>
>>> After I ruled out systemd-networkd, nftables related issues. I tracked down issues to kernel.
>> [...]
>> See Bugzilla for the full thread.
>>
>> Thorsten: The reporter had a bad bisect (some bad commits were marked as good
>> instead), hence SoB chain for culprit (unrelated) ipvu commit is in To:
>> list. I also asked the reporter (also in To:) to provide dmesg and request
>> rerunning bisection, but he doesn't currently have a reliable reproducer.
>> Is it the best I can do?
> 
> When a bisection apparently went sideways it's best to not bother the
> culprit's developers with it, they most likely will just be annoyed by
> it (and then they might become annoyed by regression tracking, which we
> need to avoid).
> 

I mean don't Cc: the culprit author in that case?

> I'd have forwarded this to the network folks, but in a style along the
> lines of "FYI, in case somebody has a idea or has heard about something
> similar and thus can help; if not, no worries, reporter is repeating the
> bisection".
> 

Aha! I missed that point. I already have networking folks in To: list.

Thanks!

-- 
An old man doll... just what I always wanted! - Clara