linux-kernel - Re: WARNING: refcount bug in kobject_add

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Message-ID: <0000000000004b4bbc05a3627e5e@google.com>
Date:   Wed, 15 Apr 2020 23:25:04 -0700
From:   syzbot <syzbot+32259bb9bc1a487ad206@...kaller.appspotmail.com>
To:     benh@...nel.crashing.org, gregkh@...uxfoundation.org,
        linux-kernel@...r.kernel.org, longman@...hat.com, mingo@...nel.org,
        peterz@...radead.org, rafael@...nel.org,
        syzkaller-bugs@...glegroups.com, torvalds@...ux-foundation.org
Subject: Re: WARNING: refcount bug in kobject_add_internal

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=1127249be00000
start commit:   6fbc7275 Linux 5.2-rc7
git tree:       upstream
kernel config:  https://syzkaller.appspot.com/x/.config?x=bff6583efcfaed3f
dashboard link: https://syzkaller.appspot.com/bug?extid=32259bb9bc1a487ad206
syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=115bad39a00000
C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1241bdd5a00000

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