linux-kernel - Re: Fwd: RCU stalls with wireguard over bonding over igb on Linux 6.3.0+

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Message-ID: <644f4551-32e8-11f9-0d4a-ad1045fdae77@gmail.com>
Date:   Sun, 2 Jul 2023 21:08:27 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>,
        Eric DeVolder <eric.devolder@...cle.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>,
        David R <david@...olicited.net>,
        Boris Ostrovsky <boris.ovstrosky@...cle.com>,
        Miguel Luis <miguel.luis@...cle.com>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        Boqun Feng <boqun.feng@...il.com>,
        "Jason A. Donenfeld" <Jason@...c4.com>,
        Jay Vosburgh <j.vosburgh@...il.com>,
        Andy Gospodarek <andy@...yhouse.net>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux RCU <rcu@...r.kernel.org>,
        Wireguard Mailing List <wireguard@...ts.zx2c4.com>,
        Linux Networking <netdev@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Manuel 'satmd' Leiner <manuel.leiner@....de>
Subject: Re: Fwd: RCU stalls with wireguard over bonding over igb on Linux
 6.3.0+

On 7/2/23 19:37, Linux regression tracking (Thorsten Leemhuis) wrote:
> On 02.07.23 13:57, Bagas Sanjaya wrote:
>> [also Cc: original reporter]
> 
> BTW: I think you CCed too many developers here. There are situations
> where this can makes sense, but it's rare. And if you do this too often
> people might start to not really look into your mails or might even
> ignore them completely.
> 
> Normally it's enough to write the mail to (1) the people in the
> signed-off-by-chain, (2) the maintainers of the subsystem that merged a
> commit, and (3) the lists for all affected subsystems; leave it up to
> developers from the first two groups to CC the maintainers of the third
> group.
> 

Hi,

In this case I had to also Cc: wireguard, bonding, RCU, and x86 people,
since this issue spans these subsystems (I naively thought). Anyway,
thanks for detailed tip (honestly /me wonder if I forgot this later, as
is often the case).

>> On 7/2/23 10:31, Bagas Sanjaya wrote:
>>> I notice a regression report on Bugzilla [1]. Quoting from it:
>>>
>>>> I've spent the last week on debugging a problem with my attempt to upgrade my kernel from 6.2.8 to 6.3.8 (now also with 
>> [...]
>>> See Bugzilla for the full thread.
>>>
>>> Anyway, I'm adding it to regzbot to make sure it doesn't fall through cracks
>>> unnoticed:
>>>
>>> #regzbot introduced: fed8d8773b8ea6 https://bugzilla.kernel.org/show_bug.cgi?id=217620
>>> #regzbot title: correcting acpi_is_processor_usable() check causes RCU stalls with wireguard over bonding+igb
>>> #regzbot link: https://bugs.gentoo.org/909066
> 
>> satmd: Can you repeat bisection to confirm that fed8d8773b8ea6 is
>> really the culprit?
> 
> I'd be careful to ask people that, as that might mean a lot of work for
> them. Best to leave things like that to developers, unless it's pretty
> obvious that something went sideways.
> 

OK.

>> Thorsten: It seems like the reporter concluded bisection to the
>> (possibly) incorrect culprit.
> 
> What makes your think so? I just looked at bugzilla and it (for now)
> seems reverting fed8d8773b8ea6 ontop of 6.4 fixed things for the
> reporter, which is a pretty strong indicator that this change really
> causes the trouble somehow.
> 

OK too.

> /me really wonders what's he's missing
> 
>> What can I do in this case besides
>> asking to repeat bisection?
> 
> Not much apart from updating regzbot state (e.g. something like "regzbot
> introduced v6.3..v6.4") and a reply to your initial report (ideally with
> a quick apology) to let everyone know it was a false alarm.
> 

OK.

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