linux-kernel - Re: After kernel 6.3.7 or 6.3.8 b43 driver fails

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Message-ID: <08ea34c8-7194-eafb-98f4-1e0b52ca7e81@leemhuis.info>
Date:   Sat, 24 Jun 2023 16:00:30 +0200
From:   "Linux regression tracking (Thorsten Leemhuis)" 
        <regressions@...mhuis.info>
To:     Arnd Bergmann <arnd@...db.de>,
        Michael Büsch <m@...s.ch>,
        Bagas Sanjaya <bagasdotme@...il.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux Regressions <regressions@...ts.linux.dev>,
        Linux Wireless <linux-wireless@...r.kernel.org>,
        Netdev <netdev@...r.kernel.org>,
        kernel test robot <lkp@...el.com>,
        Simon Horman <simon.horman@...igine.com>,
        Larry Finger <Larry.Finger@...inger.net>,
        Kalle Valo <kvalo@...nel.org>, sardonimous@...mail.com
Subject: Re: After kernel 6.3.7 or 6.3.8 b43 driver fails

On 24.06.23 11:29, Arnd Bergmann wrote:
> On Sat, Jun 24, 2023, at 10:50, Michael Büsch wrote:
>> On Sat, 24 Jun 2023 08:44:15 +0700
>> Bagas Sanjaya <bagasdotme@...il.com> wrote:
>>>> I suspect change introduced when addressing a compiler warning
>>>> cased the error.
>>>>
>>>> https://patchwork.kernel.org/project/linux-wireless/patch/20230516183442.536589-1-arnd%40kernel.org/
>>
>> I doubt it.
>> This patch affects the device initialization code. But the crash is in
>> the transmit path.
>> Can you please double check by manually reverting the patch?
> 
> I'm travelling at the moment and can't easily check it, but I would
> expect that my patch has no effect on the generated object code [...]

Michael, Arnd, thx for the replies. To you and everyone else that looked
into this: sorry for the trouble this caused.

The reporter's guess was wrong, as the reporter meanwhile confirmed in
the bugzilla ticket that the problem started to happen earlier.

Bagas, please be a bit more careful and don't blame a specific commit
unless it's was found by bisection, a revert through a lucky guess, a
statement from a developer, or something like that. In cases like this
it would have been better to sent the developers of said commit a quick
mail along the lines of "could you imagine that this change could lead
to the problem the reporter described". But even that might be too much
in a case like this, as too many of such false alarms and inquiries will
make developers start hating or ignoring regression tracking in general
or mails from you or me – and that is something that must be avoided, as
without help from developers regression tracking becomes a lot harder or
impossible.

Ciao, Thorsten (wearing his 'the Linux kernel's regression tracker' hat)
--
Everything you wanna know about Linux kernel regression tracking:
https://linux-regtracking.leemhuis.info/about/#tldr
If I did something stupid, please tell me, as explained on that page.

P.S.: Updating regzbot status, while at it:

#regzbot introduced: v6.1..v6.2