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Date:   Thu, 11 Apr 2019 23:44:01 -0700
From:   syzbot <syzbot+e28037ac1c96d2a86e89@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, benjamin.gaignard@...aro.org,
        cmetcalf@...hip.com, daniel.vetter@...ll.ch,
        daniel.vetter@...el.com, davem@...emloft.net, kuznet@....inr.ac.ru,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        vincent.abriou@...com, yoshfuji@...ux-ipv6.org
Subject: Re: WARNING: refcount bug in igmp_start_timer

syzbot has bisected this bug to:

commit fc5e9d63a8db40e9e3a3b180be33d44af8a3cee8
Author: Daniel Vetter <daniel.vetter@...ll.ch>
Date:   Wed May 24 14:52:05 2017 +0000

     drm/sti: Drop drm_vblank_cleanup

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=13f62c2d200000
start commit:   ae596de1 Compiler Attributes: naked can be shared
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=100e2c2d200000
console output: https://syzkaller.appspot.com/x/log.txt?x=17f62c2d200000
kernel config:  https://syzkaller.appspot.com/x/.config?x=5fa12be50bca08d8
dashboard link: https://syzkaller.appspot.com/bug?extid=e28037ac1c96d2a86e89
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=178537da400000

Reported-by: syzbot+e28037ac1c96d2a86e89@...kaller.appspotmail.com
Fixes: fc5e9d63a8db ("drm/sti: Drop drm_vblank_cleanup")

For information about bisection process see: https://goo.gl/tpsmEJ#bisection

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