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

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Message-ID: <38d777292f5335b5ea5f8fd7c0b58c514dda525a.camel@kernel.crashing.org>
Date:   Tue, 02 Jul 2019 12:44:18 +1000
From:   Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:     gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
        rafael@...nel.org, syzkaller-bugs@...glegroups.com,
        torvalds@...ux-foundation.org
Cc:     Muchun Song <smuchun@...il.com>
Subject: Re: WARNING: refcount bug in kobject_add_internal

Munchun, is this what your patch fixes ?


On Mon, 2019-07-01 at 16:27 -0700, syzbot wrote:
> syzbot has bisected this bug to:
> 
> commit 726e41097920a73e4c7c33385dcc0debb1281e18
> Author: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Date:   Tue Jul 10 00:29:10 2018 +0000
> 
>      drivers: core: Remove glue dirs from sysfs earlier
> 
> bisection log:  
> https://syzkaller.appspot.com/x/bisect.txt?x=140d6739a00000
> start commit:   6fbc7275 Linux 5.2-rc7
> git tree:       upstream
> final crash:    
> https://syzkaller.appspot.com/x/report.txt?x=160d6739a00000
> console output: 
> https://syzkaller.appspot.com/x/log.txt?x=120d6739a00000
> 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
> 
> Reported-by: syzbot+32259bb9bc1a487ad206@...kaller.appspotmail.com
> Fixes: 726e41097920 ("drivers: core: Remove glue dirs from sysfs
> earlier")
> 
> For information about bisection process see: 
> https://goo.gl/tpsmEJ#bisection