linux-kernel - Re: WARNING in perf_group

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Date:   Fri, 22 Nov 2019 08:29:00 -0800
From:   syzbot <syzbot+23fe48cbe532abffa52e@...kaller.appspotmail.com>
To:     acme@...nel.org, acme@...hat.com,
        alexander.shishkin@...ux.intel.com, daniel@...earbox.net,
        davem@...emloft.net, jbacik@...com, jolsa@...hat.com,
        kernel-team@...com, linux-kernel@...r.kernel.org, mingo@...nel.org,
        mingo@...hat.com, namhyung@...nel.org, peterz@...radead.org,
        rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, tglx@...utronix.de,
        torvalds@...ux-foundation.org, yhs@...com
Subject: Re: WARNING in perf_group_attach

syzbot has bisected this bug to:

commit 33ea4b24277b06dbc55d7f5772a46f029600255e
Author: Song Liu <songliubraving@...com>
Date:   Wed Dec 6 22:45:16 2017 +0000

     perf/core: Implement the 'perf_uprobe' PMU

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1038fecae00000
start commit:   0072a0c1 Merge tag 'media/v4.20-4' of git://git.kernel.org..
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1238fecae00000
console output: https://syzkaller.appspot.com/x/log.txt?x=1438fecae00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=b9cc5a440391cbfd
dashboard link: https://syzkaller.appspot.com/bug?extid=23fe48cbe532abffa52e
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=135e93eb400000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13189415400000

Reported-by: syzbot+23fe48cbe532abffa52e@...kaller.appspotmail.com
Fixes: 33ea4b24277b ("perf/core: Implement the 'perf_uprobe' PMU")

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