linux-kernel - Re: [syzbot] possible deadlock in wake_up_all_idle

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Date:   Sat, 16 Oct 2021 16:32:05 -0700
From:   syzbot <syzbot+d5b23b18d2f4feae8a67@...kaller.appspotmail.com>
To:     bigeasy@...utronix.de, bristot@...hat.com, bsegall@...gle.com,
        dietmar.eggemann@....com, gor@...ux.ibm.com, jgross@...e.com,
        juri.lelli@...hat.com, linux-kernel@...r.kernel.org,
        mgorman@...e.de, mingo@...nel.org, mingo@...hat.com,
        namit@...are.com, peterz@...radead.org, rdunlap@...radead.org,
        rostedt@...dmis.org, syzkaller-bugs@...glegroups.com,
        vincent.guittot@...aro.org
Subject: Re: [syzbot] possible deadlock in wake_up_all_idle_cpus

syzbot has bisected this issue to:

commit 8850cb663b5cda04d33f9cfbc38889d73d3c8e24
Author: Peter Zijlstra <peterz@...radead.org>
Date:   Tue Sep 21 20:16:02 2021 +0000

    sched: Simplify wake_up_*idle*()

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=117802fb300000
start commit:   7c832d2f9b95 Add linux-next specific files for 20211015
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=137802fb300000
console output: https://syzkaller.appspot.com/x/log.txt?x=157802fb300000
kernel config:  https://syzkaller.appspot.com/x/.config?x=f6ac42766a768877
dashboard link: https://syzkaller.appspot.com/bug?extid=d5b23b18d2f4feae8a67
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=14e920fcb00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=13b83d80b00000

Reported-by: syzbot+d5b23b18d2f4feae8a67@...kaller.appspotmail.com
Fixes: 8850cb663b5c ("sched: Simplify wake_up_*idle*()")

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