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

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Date:   Tue, 19 Oct 2021 10:09:13 -0700
From:   syzbot <syzbot+4b71bb3365e7d5228913@...kaller.appspotmail.com>
To:     acme@...nel.org, alexander.shishkin@...ux.intel.com,
        andrii@...nel.org, ast@...nel.org, bigeasy@...utronix.de,
        bpf@...r.kernel.org, bristot@...hat.com, bsegall@...gle.com,
        daniel@...earbox.net, dietmar.eggemann@....com, gor@...ux.ibm.com,
        jgross@...e.com, john.fastabend@...il.com, jolsa@...hat.com,
        juri.lelli@...hat.com, kafai@...com, kpsingh@...nel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        mark.rutland@....com, mgorman@...e.de, mingo@...hat.com,
        namhyung@...nel.org, namit@...are.com, netdev@...r.kernel.org,
        peterz@...radead.org, rostedt@...dmis.org, songliubraving@...com,
        syzkaller-bugs@...glegroups.com, vincent.guittot@...aro.org,
        yhs@...com
Subject: Re: [syzbot] possible deadlock in perf_event_ctx_lock_nested (2)

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=166a8c90b00000
start commit:   60e8840126bd Add linux-next specific files for 20211018
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=156a8c90b00000
console output: https://syzkaller.appspot.com/x/log.txt?x=116a8c90b00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=4bd44cafcda7632e
dashboard link: https://syzkaller.appspot.com/bug?extid=4b71bb3365e7d5228913
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=11eccf58b00000

Reported-by: syzbot+4b71bb3365e7d5228913@...kaller.appspotmail.com
Fixes: 8850cb663b5c ("sched: Simplify wake_up_*idle*()")

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