From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [PATCH] ip_gre: fix ip-config error reported by lkp-robot
Date: Mon, 13 Nov 2017 09:58:23 +0900 (KST)
Message-ID: <20171113.095823.1390842591777079522.davem@davemloft.net>
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From: William Tu <u9012063@gmail.com>
Date: Tue,  7 Nov 2017 07:57:44 -0800

> lkp-robot reports the following two errors:
>   IP-Config: Failed to open gretap0
>   IP-Config: Failed to open erspan0
> due to device's mac address is zero.  Fix it by assigning
> a random Ethernet address.
> 
> Signed-off-by: William Tu <u9012063@gmail.com>

This isn't really a good idea.

If there is a tunnel source address of zero, which is where the device
address comes from, we shouldn't allow the interface to come up
because it is misconfigured.