linux-kernel - Re: [GIT PULL] Networking for v6.17

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Message-ID: <da6a2585-daa3-4dd7-bc42-5a78a24b29c2@broadcom.com>
Date: Tue, 5 Aug 2025 11:26:20 -0700
From: Florian Fainelli <florian.fainelli@...adcom.com>
To: Linus Torvalds <torvalds@...ux-foundation.org>,
 Jakub Kicinski <kuba@...nel.org>, John Ernberg <john.ernberg@...ia.se>
Cc: davem@...emloft.net, netdev@...r.kernel.org,
 linux-kernel@...r.kernel.org, pabeni@...hat.com
Subject: Re: [GIT PULL] Networking for v6.17

On 8/5/25 11:22, Linus Torvalds wrote:
> On Tue, 5 Aug 2025 at 19:22, Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
>>
>> On Sun, 27 Jul 2025 at 04:35, Jakub Kicinski <kuba@...nel.org> wrote:
>>>
>>> Networking changes for 6.17.
>>
>> So I found out the hard way while traveling that this networking pull
>> seems to have broken USB tethering for me. Which I only use when
>> traveling, but then I do often end up relying on my phone as the
>> source of internet (the phone being on the single-device flight wifi,
>> and tethering to the laptop which is why hotspot doesn't necessarily
>> work).
>>
>> It *might* be something else, and I'm bisecting it right now, but the
>> networking pull is the obvious first suspect, and my first three
>> bisection steps have taken me into that pull.
> 
> To absolutely zero surprise, it continued to bisect into the
> networking pull, and this is the end result:
> 
>    0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f is the first bad commit
>    commit 0d9cfc9b8cb17dbc29a98792d36ec39a1cf1395f
>    Author: John Ernberg <john.ernberg@...ia.se>
>    Date:   Wed Jul 23 10:25
> 
>        net: usbnet: Avoid potential RCU stall on LINK_CHANGE event
> 
> and I'll test with that just reverted on top of current -tip. But it
> bisected right to that commit, and the commit certainly makes sense as
> a "that could break usbnet" commit, so I expect that the revert will
> indeed fix it.
> 
> Considering that I will need usb tethering while traveling during the
> rest of the merge window, I almost certainly will just revert it for
> good tomorrow, but if somebody comes up with a fix for this that
> doesn't involve a revert, I'm all ears.

Looks like someone posted a fix a few days ago:

https://lore.kernel.org/all/20250801190310.58443-1-ammarfaizi2@gnuweeb.org/

though it does not appear to be in this pull request. Can you test it?
-- 
Florian