netdev - Useless debug warning "netlink: 16 bytes leftover after parsing attributes"

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Message-Id: <0756CFFC-5BF7-4685-A1E2-0D88B2898454@holtmann.org>
Date:   Tue, 18 Oct 2016 07:06:50 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Network Development <netdev@...r.kernel.org>
Cc:     Michal Schmidt <mschmidt@...hat.com>
Subject: Useless debug warning "netlink: 16 bytes leftover after parsing
 attributes"

Hi,

so lately I am seeing a bunch of these warnings:

netlink: 16 bytes leftover after parsing attributes..

While they give you the process name, they are still useless to track down the message that causes them. I find them even more useless since an updated userspace on an older kernel can trigger the nla_policy warning here. And that updated userspace program is doing nothing wrong by including extra attributes. So what purpose is this warning serving?

Regards

Marcel