netdev - Re: WARNING: kobject bug in br_add

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Message-ID: <2170a49c-be84-1bf4-4c73-bf7a668e5288@cumulusnetworks.com>
Date:   Thu, 26 Apr 2018 14:49:29 +0300
From:   Nikolay Aleksandrov <nikolay@...ulusnetworks.com>
To:     Hangbin Liu <liuhangbin@...il.com>,
        Dmitry Vyukov <dvyukov@...gle.com>
Cc:     syzbot <syzbot+de73361ee4971b6e6f75@...kaller.appspotmail.com>,
        bridge@...ts.linux-foundation.org,
        David Miller <davem@...emloft.net>,
        LKML <linux-kernel@...r.kernel.org>,
        netdev <netdev@...r.kernel.org>,
        stephen hemminger <stephen@...workplumber.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: WARNING: kobject bug in br_add_if

On 26/04/18 13:37, Hangbin Liu wrote:
> On Thu, Apr 26, 2018 at 10:04:16AM +0200, Dmitry Vyukov wrote:
>> On Thu, Apr 26, 2018 at 8:13 AM, Hangbin Liu <liuhangbin@...il.com> wrote:
>>> On Wed, Apr 11, 2018 at 05:18:23PM +0200, Dmitry Vyukov wrote:
>>>> On Wed, Apr 11, 2018 at 5:15 PM, syzbot
>>>> <syzbot+de73361ee4971b6e6f75@...kaller.appspotmail.com> wrote:
>>>>> kobject_add_internal failed for brport (error: -12 parent: bond0)
[snip]
> 
> Re-checked the error. This is a -ENOMEM. So normally we could ignore it.
> 
> But on the other hand, although we could find out the slave iface's
> master in netdev_master_upper_dev_link(). It already go much further
> and allocate some resource and change iface state. e.g.
> 
> [54273.968516] br0: port 1(em1) entered blocking state
> [54273.973979] br0: port 1(em1) entered disabled state
> 
> So I think we'd better return as early as possible. I will post a fix
> for this.
> 
> Thanks
> Hangbin

If I'm not mistaken the bridge allocated resources for the port are
cleaned on kobject_init_and_add() error return. Or are you talking
about some other resources ?