linux-kernel - Re: [syzbot] WARNING in __perf_event

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Message-ID: <CANpmjNNwjCWa0TX4CYShB5KrErWEd-z0BgpZTrpofnJNx-MkvA@mail.gmail.com>
Date:   Thu, 3 Nov 2022 08:26:47 +0100
From:   Marco Elver <elver@...gle.com>
To:     syzbot <syzbot+589d998651a580e6135d@...kaller.appspotmail.com>
Cc:     acme@...nel.org, alex.williamson@...hat.com,
        alexander.shishkin@...ux.intel.com, bpf@...r.kernel.org,
        cohuck@...hat.com, dvyukov@...gle.com, jgg@...pe.ca,
        jolsa@...nel.org, kevin.tian@...el.com, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        mark.rutland@....com, mingo@...hat.com, namhyung@...nel.org,
        netdev@...r.kernel.org, peterz@...radead.org,
        shameerali.kolothum.thodi@...wei.com,
        syzkaller-bugs@...glegroups.com, yishaih@...dia.com
Subject: Re: [syzbot] WARNING in __perf_event_overflow

On Thu, 3 Nov 2022 at 06:26, syzbot
<syzbot+589d998651a580e6135d@...kaller.appspotmail.com> wrote:
>
> syzbot has bisected this issue to:
>
> commit c1d050b0d169fd60c8acef157db53bd4e3141799
> Author: Yishai Hadas <yishaih@...dia.com>
> Date:   Thu Sep 8 18:34:45 2022 +0000
>
>     vfio/mlx5: Create and destroy page tracker object
>
> bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=136eb2da880000
> start commit:   88619e77b33d net: stmmac: rk3588: Allow multiple gmac cont..
> git tree:       bpf
> final oops:     https://syzkaller.appspot.com/x/report.txt?x=10eeb2da880000
> console output: https://syzkaller.appspot.com/x/log.txt?x=176eb2da880000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=a66c6c673fb555e8
> dashboard link: https://syzkaller.appspot.com/bug?extid=589d998651a580e6135d
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11eabcea880000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=10f7e632880000
>
> Reported-by: syzbot+589d998651a580e6135d@...kaller.appspotmail.com
> Fixes: c1d050b0d169 ("vfio/mlx5: Create and destroy page tracker object")
>
> For information about bisection process see: https://goo.gl/tpsmEJ#bisection

The bisection is wrong - see
https://lore.kernel.org/all/20221031093513.3032814-1-elver@google.com/