linux-kernel - Re: WARNING in kthread_queue

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Date:   Wed, 15 Jul 2020 03:04:04 -0700
From:   syzbot <syzbot+fa64e680a1ff32087778@...kaller.appspotmail.com>
To:     akpm@...ux-foundation.org, axboe@...nel.dk,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        pmladek@...e.com, qiang.zhang@...driver.com, sfr@...b.auug.org.au,
        syzkaller-bugs@...glegroups.com
Subject: Re: WARNING in kthread_queue_work

syzbot has bisected this issue to:

commit 4977caef05aa154f5e45a232fc4f0e1c74a0c739
Author: Zhang Qiang <qiang.zhang@...driver.com>
Date:   Tue Jul 7 02:29:47 2020 +0000

    kthread: work could not be queued when worker being destroyed

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=12c58f57100000
start commit:   89032636 Add linux-next specific files for 20200708
git tree:       linux-next
final oops:     https://syzkaller.appspot.com/x/report.txt?x=11c58f57100000
console output: https://syzkaller.appspot.com/x/log.txt?x=16c58f57100000
kernel config:  https://syzkaller.appspot.com/x/.config?x=64a250ebabc6c320
dashboard link: https://syzkaller.appspot.com/bug?extid=fa64e680a1ff32087778
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=16bf9f2f100000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=118380ed100000

Reported-by: syzbot+fa64e680a1ff32087778@...kaller.appspotmail.com
Fixes: 4977caef05aa ("kthread: work could not be queued when worker being destroyed")

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