netdev - Re: WARNING in kernfs_create_dir

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Date:   Wed, 15 Apr 2020 17:11:03 -0700
From:   syzbot <syzbot+38f5d5cf7ae88c46b11a@...kaller.appspotmail.com>
To:     a@...table.cc, b.a.t.m.a.n@...ts.open-mesh.org,
        davem@...emloft.net, gregkh@...uxfoundation.org, hdanton@...a.com,
        hongjiefang@...micro.com, linux-kernel@...r.kernel.org,
        linux-mmc@...r.kernel.org, longman@...hat.com,
        mareklindner@...mailbox.ch, mingo@...nel.org,
        netdev@...r.kernel.org, peterz@...radead.org,
        sw@...onwunderlich.de, syzkaller-bugs@...glegroups.com,
        tj@...nel.org, ulf.hansson@...aro.org
Subject: Re: WARNING in kernfs_create_dir_ns

syzbot suspects this bug was fixed by commit:

commit 810507fe6fd5ff3de429121adff49523fabb643a
Author: Waiman Long <longman@...hat.com>
Date:   Thu Feb 6 15:24:08 2020 +0000

    locking/lockdep: Reuse freed chain_hlocks entries

bisection log:  https://syzkaller.appspot.com/x/bisect.txt?x=1008138be00000
start commit:   72825454 Merge branch 'x86-urgent-for-linus' of git://git...
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=9a31528e58cc12e2
dashboard link: https://syzkaller.appspot.com/bug?extid=38f5d5cf7ae88c46b11a
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=12a6c439a00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1353c323a00000

If the result looks correct, please mark the bug fixed by replying with:

#syz fix: locking/lockdep: Reuse freed chain_hlocks entries

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