linux-kernel - Re: WARNING in print_bfs

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Message-ID: <20200928075612.GB2594@hirez.programming.kicks-ass.net>
Date:   Mon, 28 Sep 2020 09:56:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+62ebe501c1ce9a91f68c@...kaller.appspotmail.com>,
        Ingo Molnar <mingo@...hat.com>, Will Deacon <will@...nel.org>,
        Alexei Starovoitov <ast@...nel.org>, bpf <bpf@...r.kernel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        David Miller <davem@...emloft.net>,
        David Ahern <dsahern@...il.com>,
        Florian Fainelli <f.fainelli@...il.com>, hawk@...nel.org,
        Ido Schimmel <idosch@...lanox.com>,
        Jakub Kicinski <jakub.kicinski@...ronome.com>,
        Jiri Pirko <jiri@...lanox.com>,
        Johannes Berg <johannes.berg@...el.com>,
        John Fastabend <john.fastabend@...il.com>,
        Martin KaFai Lau <kafai@...com>,
        Alexey Kuznetsov <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Kubecek <mkubecek@...e.cz>,
        netdev <netdev@...r.kernel.org>, petrm@...lanox.com,
        Roopa Prabhu <roopa@...ulusnetworks.com>,
        Song Liu <songliubraving@...com>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Yonghong Song <yhs@...com>,
        Hideaki YOSHIFUJI <yoshfuji@...ux-ipv6.org>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Boqun Feng <boqun.feng@...il.com>
Subject: Re: WARNING in print_bfs_bug

On Sun, Sep 27, 2020 at 10:57:24AM +0200, Dmitry Vyukov wrote:
> On Thu, Oct 31, 2019 at 9:39 PM syzbot
> <syzbot+62ebe501c1ce9a91f68c@...kaller.appspotmail.com> wrote:
> >
> > syzbot has found a reproducer for the following crash on:
> >
> > HEAD commit:    49afce6d Add linux-next specific files for 20191031
> > git tree:       linux-next
> > console output: https://syzkaller.appspot.com/x/log.txt?x=11eea36ce00000
> > kernel config:  https://syzkaller.appspot.com/x/.config?x=3c5f119b33031056
> > dashboard link: https://syzkaller.appspot.com/bug?extid=62ebe501c1ce9a91f68c
> > compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> > syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14c162f4e00000
> > C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=131b5eb8e00000
> >
> > IMPORTANT: if you fix the bug, please add the following tag to the commit:
> > Reported-by: syzbot+62ebe501c1ce9a91f68c@...kaller.appspotmail.com
> 
> This is another LOCKDEP-related top crasher. syzkaller finds just this
> one (see below).
> I think we need to disable LOCKDEP temporary until this and other
> LOCKDEP issues are resolved. I've filed
> https://github.com/google/syzkaller/issues/2140 to track
> disabling/enabling.

There is a potential patch for it:

  https://lkml.kernel.org/r/20200917080210.108095-1-boqun.feng@gmail.com

Let me try and digest it.