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Date:   Wed, 22 Aug 2018 07:11:41 +0300 (EEST)
From:   Julian Anastasov <>
To:     Cong Wang <>
cc:,, Dmitry Vyukov <>,
        LKML <>,
        Linux Kernel Network Developers <>,
Subject: Re: unregister_netdevice: waiting for DEV to become free (2)


On Mon, 20 Aug 2018, Cong Wang wrote:

> For the one I look into, dst_cache doesn't matter, because the xmit
> path doesn't even use tunnel dst_cache at all, and it is ip6tnl0 FB
> device, unlike this one which is tun device.

	Ops, of course, it is dev tun and not ip tun...

> For the one I look into, it seems some fib6_info is not released for
> some reason. It seems to be the one created by addrconf_prefix_route(),
> which is supposed to be released by fib6_clean_tree() I think, but it
> never happens.

	May be, it is not direct reference to dev but one
that is moved to loopback, like from dst, route... The repro.c
creates permanent neighbours and addresses.


Julian Anastasov <>

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