linux-kernel - Re: INFO: task hung in perf_event_free

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Date:   Tue, 30 Jul 2019 11:44:00 -0700
From:   syzbot <syzbot+7692cea7450c97fa2a0a@...kaller.appspotmail.com>
To:     acme@...nel.org, acme@...hat.com,
        alexander.shishkin@...ux.intel.com, ast@...nel.org,
        bpf@...r.kernel.org, daniel@...earbox.net, eranian@...gle.com,
        jolsa@...hat.com, kafai@...com, linux-kernel@...r.kernel.org,
        mark.rutland@....com, mingo@...nel.org, mingo@...hat.com,
        namhyung@...nel.org, netdev@...r.kernel.org, peterz@...radead.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com,
        tglx@...utronix.de, torvalds@...ux-foundation.org,
        vincent.weaver@...ne.edu, yhs@...com
Subject: Re: INFO: task hung in perf_event_free_task

syzbot has bisected this bug to:

commit 1cf8dfe8a661f0462925df943140e9f6d1ea5233
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Sat Jul 13 09:21:25 2019 +0000

     perf/core: Fix race between close() and fork()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1523f40c600000
start commit:   c6dd78fc Merge branch 'x86-urgent-for-linus' of git://git...
git tree:       upstream
final crash:    https://syzkaller.appspot.com/x/report.txt?x=1723f40c600000
console output: https://syzkaller.appspot.com/x/log.txt?x=1323f40c600000
kernel config:  https://syzkaller.appspot.com/x/.config?x=7937b718ddac333b
dashboard link: https://syzkaller.appspot.com/bug?extid=7692cea7450c97fa2a0a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=17e888cc600000

Reported-by: syzbot+7692cea7450c97fa2a0a@...kaller.appspotmail.com
Fixes: 1cf8dfe8a661 ("perf/core: Fix race between close() and fork()")

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