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Date:   Sun, 08 Dec 2019 02:17:01 -0800
From:   syzbot <syzbot+23fe48cbe532abffa52e@...kaller.appspotmail.com>
To:     Kernel-team@...com, acme@...nel.org, acme@...hat.com,
        alexander.shishkin@...ux.intel.com, arvid.brodin@...en.se,
        ast@...nel.org, bpf@...r.kernel.org, daniel@...earbox.net,
        davem@...emloft.net, jbacik@...com, jolsa@...hat.com, kafai@...com,
        kernel-team@...com, linux-kernel@...r.kernel.org, mingo@...nel.org,
        mingo@...hat.com, namhyung@...nel.org, netdev@...r.kernel.org,
        peterz@...radead.org, rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, xiyou.wangcong@...il.com, yhs@...com
Subject: Re: WARNING in perf_group_attach

syzbot suspects this bug was fixed by commit:

commit 311633b604063a8a5d3fbc74d0565b42df721f68
Author: Cong Wang <xiyou.wangcong@...il.com>
Date:   Wed Jul 10 06:24:54 2019 +0000

     hsr: switch ->dellink() to ->ndo_uninit()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1639a42ae00000
start commit:   6fbc7275 Linux 5.2-rc7
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=f6451f0da3d42d53
dashboard link: https://syzkaller.appspot.com/bug?extid=23fe48cbe532abffa52e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=1758795da00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=11d2fa1ba00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: hsr: switch ->dellink() to ->ndo_uninit()

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

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