netdev - Re: WARNING: ODEBUG bug in netdev

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Date:   Mon, 24 Jun 2019 11:33:56 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     syzbot <syzbot+c4521ac872a4ccc3afec@...kaller.appspotmail.com>
cc:     alexander.h.duyck@...el.com, amritha.nambiar@...el.com,
        andriy.shevchenko@...ux.intel.com, davem@...emloft.net,
        dmitry.torokhov@...il.com, f.fainelli@...il.com,
        gregkh@...uxfoundation.org, idosch@...lanox.com,
        linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
        syzkaller-bugs@...glegroups.com, tyhicks@...onical.com,
        wanghai26@...wei.com, yuehaibing@...wei.com
Subject: Re: WARNING: ODEBUG bug in netdev_freemem (2)

On Mon, 24 Jun 2019, syzbot wrote:

> Hello,
> 
> syzbot found the following crash on:
> 
> HEAD commit:    fd6b99fa Merge branch 'akpm' (patches from Andrew)
> git tree:       upstream
> console output: https://syzkaller.appspot.com/x/log.txt?x=144de256a00000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=fa9f7e1b6a8bb586
> dashboard link: https://syzkaller.appspot.com/bug?extid=c4521ac872a4ccc3afec
> compiler:       gcc (GCC) 9.0.0 20181231 (experimental)
> 
> Unfortunately, I don't have any reproducer for this crash yet.
> 
> IMPORTANT: if you fix the bug, please add the following tag to the commit:
> Reported-by: syzbot+c4521ac872a4ccc3afec@...kaller.appspotmail.com
> 
> device hsr_slave_0 left promiscuous mode
> team0 (unregistering): Port device team_slave_1 removed
> team0 (unregistering): Port device team_slave_0 removed
> bond0 (unregistering): Releasing backup interface bond_slave_1
> bond0 (unregistering): Releasing backup interface bond_slave_0
> bond0 (unregistering): Released all slaves
> ------------[ cut here ]------------
> ODEBUG: free active (active state 0) object type: timer_list hint:
> delayed_work_timer_fn+0x0/0x90 arch/x86/include/asm/paravirt.h:767

One of the cleaned up devices has left an active timer which belongs to a
delayed work. That's all I can decode out of that splat. :(

Thanks,

	tglx