netdev - Re: unregister_netdevice: waiting for DEV to become free

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Date:   Wed, 1 Aug 2018 10:57:49 +0200
From:   Steffen Klassert <steffen.klassert@...unet.com>
To:     Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
CC:     Herbert Xu <herbert@...dor.apana.org.au>,
        "David S. Miller" <davem@...emloft.net>,
        syzbot <syzbot+2dfb68e639f0621b19fb@...kaller.appspotmail.com>,
        <ddstreet@...e.org>, <dvyukov@...gle.com>,
        <linux-kernel@...r.kernel.org>, <netdev@...r.kernel.org>,
        <syzkaller-bugs@...glegroups.com>
Subject: Re: unregister_netdevice: waiting for DEV to become free

On Tue, Jul 31, 2018 at 01:31:52PM +0200, Steffen Klassert wrote:
> On Tue, Jul 31, 2018 at 08:16:22PM +0900, Tetsuo Handa wrote:
> > Steffen and Herbert,
> > 
> > Do you have any question? I think I provided enough information for debugging.
> 
> It seems that I was not on Cc at the beginning of the threat,
> so I had to search the web for some context.
> 
> I'm currently trying your reproducer (still with my .config) but I don't
> hit the problem.

Actually, I did not hit it because it is already fixed in my tree.

It is fixed by:

commit 8cc88773855f988d6a3bbf102bbd9dd9c828eb81
xfrm: fix missing dst_release() after policy blocking lbcast and multicast

This fix went to mainline on Monday.