netdev - Re: [syzbot] WARNING in c

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Message-ID: <50e2ecf5-4b83-3ba1-70a2-796d988d4c0b@I-love.SAKURA.ne.jp>
Date:   Mon, 17 Oct 2022 11:54:01 +0900
From:   Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:     Linus Torvalds <torvalds@...ux-foundation.org>,
        Yury Norov <yury.norov@...il.com>,
        Jakub Kicinski <kuba@...nel.org>
Cc:     Borislav Petkov <bp@...en8.de>,
        syzbot <syzbot+d0fd2bf0dd6da72496dd@...kaller.appspotmail.com>,
        syzkaller-bugs@...glegroups.com,
        Andrew Jones <ajones@...tanamicro.com>, netdev@...r.kernel.org,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Paolo Abeni <pabeni@...hat.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Menglong Dong <imagedong@...cent.com>,
        Kuniyuki Iwashima <kuniyu@...zon.com>,
        Petr Machata <petrm@...dia.com>,
        Guo Ren <guoren@...ux.alibaba.com>,
        "Michael S . Tsirkin" <mst@...hat.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        andriy.shevchenko@...ux.intel.com, linux@...musvillemoes.dk,
        caraitto@...gle.com, willemb@...gle.com, jonolson@...gle.com,
        amritha.nambiar@...el.com, linux-kernel@...r.kernel.org
Subject: Re: [syzbot] WARNING in c_start

On 2022/10/17 2:52, Linus Torvalds wrote:
> Anyway, since rc1 is fairly imminent, I will just revert it for now -
> I don't want to have a pending revert wait until -rc2.

Thank you, Linus.

Yury or Jakub, please send a revert request on commit 854701ba4c39 ("net: fix cpu_max_bits_warn()
usage in netif_attrmask_next{,_and}"), for https://syzkaller.appspot.com/bug?extid=9abe5ecc348676215427
says that boot is still failing.

> But I actually suspect that the thing we should really do is to just
> remove the check entirely for these functions that are already defined
> in terms of "if no more bits, return nr_cpu_ids". They already
> basically return an error case, having them *warn* about the error
> they are going to return is just obnoxious.

I agree.