linux-kernel - Re: [syzbot] WARNING in exit_tasks_rcu

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Message-ID: <000000000000ad299205e151f7d3@google.com>
Date:   Mon, 13 Jun 2022 03:44:07 -0700
From:   syzbot <syzbot+9bb26e7c5e8e4fa7e641@...kaller.appspotmail.com>
To:     andrii@...nel.org, ast@...nel.org, bpf@...r.kernel.org,
        brauner@...nel.org, daniel@...earbox.net, davem@...emloft.net,
        ebiederm@...ssion.com, frederic@...nel.org, hawk@...nel.org,
        jiangshanlai@...il.com, joel@...lfernandes.org,
        john.fastabend@...il.com, josh@...htriplett.org, kafai@...com,
        keescook@...omium.org, kpsingh@...nel.org, kuba@...nel.org,
        linux-kernel@...r.kernel.org, mathieu.desnoyers@...icios.com,
        netdev@...r.kernel.org, pabeni@...hat.com, paulmck@...nel.org,
        quic_neeraju@...cinc.com, rcu@...r.kernel.org, rostedt@...dmis.org,
        songliubraving@...com, syzkaller-bugs@...glegroups.com, yhs@...com
Subject: Re: [syzbot] WARNING in exit_tasks_rcu_finish

syzbot has bisected this issue to:

commit 09f110d4a1597185a5ed177da8573eec997b7227
Author: Paul E. McKenney <paulmck@...nel.org>
Date:   Tue May 17 18:30:32 2022 +0000

    rcu-tasks: Track blocked RCU Tasks Trace readers

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=170f6ee7f00000
start commit:   6d0c80680317 Add linux-next specific files for 20220610
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=148f6ee7f00000
console output: https://syzkaller.appspot.com/x/log.txt?x=108f6ee7f00000
kernel config:  https://syzkaller.appspot.com/x/.config?x=a30d6e3e814e5931
dashboard link: https://syzkaller.appspot.com/bug?extid=9bb26e7c5e8e4fa7e641
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=177b6230080000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=148207bff00000

Reported-by: syzbot+9bb26e7c5e8e4fa7e641@...kaller.appspotmail.com
Fixes: 09f110d4a159 ("rcu-tasks: Track blocked RCU Tasks Trace readers")

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