linux-kernel - Re: [Regression] wifi problems since tg3 started throwing rcu stall warnings

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Message-ID: <eee3b235c14a84289b2fe1a40c542363@aosc.io>
Date: Thu, 07 Nov 2024 18:33:55 +0800
From: Mingcong Bai <jeffbai@...c.io>
To: Frederic Weisbecker <frederic@...nel.org>
Cc: Thorsten Leemhuis <regressions@...mhuis.info>, Linux regressions mailing
 list <regressions@...ts.linux.dev>, LKML <linux-kernel@...r.kernel.org>,
 "Paul E. McKenney" <paulmck@...nel.org>, rcu <rcu@...r.kernel.org>,
 sakiiily@...c.io
Subject: Re: [Regression] wifi problems since tg3 started throwing rcu stall
 warnings

Hi all,

在 2024-11-07 18:04，Frederic Weisbecker 写道：
> Le Thu, Nov 07, 2024 at 10:10:37AM +0100, Thorsten Leemhuis a écrit :
>> On 05.11.24 08:17, Mingcong Bai wrote:
>> > (CC-ing the laptop's owner so that she might help with further testing...)
>> > 在 2024-10-23 18:22，Linux regression tracking (Thorsten Leemhuis) 写道：
>> >> On 23.10.24 12:09, Frederic Weisbecker wrote:
>> >>> Le Wed, Oct 23, 2024 at 10:27:18AM +0200, Linux regression tracking
>> >>> (Thorsten Leemhuis) a écrit :
>> >>>>
>> >>>> Frederic, I noticed a report about a regression in bugzilla.kernel.org
>> >>>> that appears to be caused by the following change of yours:
>> >>>> 55d4669ef1b768 ("rcu: Fix rcu_barrier() VS post CPUHP_TEARDOWN_CPU
>> >>>> invocation")
>> >>> Are you sure about the commit? Below it says:
>> >> Not totally, but...
>> >>
>> >>>> As many (most?) kernel developers don't keep an eye on the bug tracker,
>> >>>> I decided to write this mail. To quote from
>> >>>> https://bugzilla.kernel.org/show_bug.cgi?id=219390:
>> >>>>
>> >>>>>  Mingcong Bai 2024-10-15 13:32:35 UTC
>> >>>>> Since aa162aa4aa383a0a714b1c36e8fcc77612ddd1a2 between v6.10.4 and
>> >>> Now that's aa162aa4aa383a0a714b1c36e8fcc77612ddd1a2 which I can't
>> >>> find in vanilla
>> >>> tree.
>> >> ...quite, as that is the commit-id of the backport to v6.10.5; and the
>> >> reporter reverted it there. Ideally of course that would have happened
>> >> on recent mainline. If you doubt, ask Mingcong Bai to check if a revert
>> >> there helps, too.
>> > Do we need any further information/testing on this issue? Please let me
>> > know if there's anything we can do as the issue still persists in 6.12.
>> 
>> Hmm, no reply from Frederic. Not sure why, maybe he is just away from
>> the keyboard for a few days. But if the reporter has a minute, it 
>> might
>> be wise to check if reverting that commit on top of 6.12-rc6 or newer
>> also fixes the problem, to rule out any interference from changes
>> specific to the stable series.
>> 
>> Ciao, Thorsten
> 
> Sorry for the lag, I still don't understand how this specific commit
> can produce this issue. Can you please retry with and without this 
> commit
> reverted?
> 
> Thanks.

Yes, we are on it. Should report back in six hours or so.

Best Regards,
Mingcong Bai