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Message-ID: <04216bf5-84a7-b6ea-57ff-9cb29a706510@6wind.com> Date: Wed, 19 Oct 2016 17:50:50 +0200 From: Nicolas Dichtel <nicolas.dichtel@...nd.com> To: Marcel Holtmann <marcel@...tmann.org>, Network Development <netdev@...r.kernel.org> Cc: Michal Schmidt <mschmidt@...hat.com> Subject: Re: Useless debug warning "netlink: 16 bytes leftover after parsing attributes" Le 18/10/2016 à 07:06, Marcel Holtmann a écrit : > 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? Usually, it means that a netlink message is malformed, for example that the header of the family has the wrong size. An unknown attribute should not trigger this kind of message. Here is an example: http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e5eca6d41f53d Regards, Nicolas
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