netdev - Re: netlink: 12 bytes leftover after parsing attributes - triggered by iproute2 libnetlink's rtnl_dump

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Message-ID: <20120403100157.GA8611@canuck.infradead.org>
Date:	Tue, 3 Apr 2012 06:01:57 -0400
From:	Thomas Graf <tgraf@...radead.org>
To:	Stephen Hemminger <shemminger@...tta.com>
Cc:	Ben Hutchings <ben@...adent.org.uk>,
	Bruno Prémont <bonbons@...ux-vserver.org>,
	netdev@...r.kernel.org, Greg Rose <gregory.v.rose@...el.com>
Subject: Re: netlink: 12 bytes leftover after parsing attributes - triggered
 by iproute2 libnetlink's rtnl_dump_request()

On Tue, Mar 20, 2012 at 05:02:29PM -0700, Stephen Hemminger wrote:
> On Tue, 20 Mar 2012 15:00:30 +0000
> Ben Hutchings <ben@...adent.org.uk> wrote:
> 
> > On Tue, 2012-03-20 at 07:41 -0700, Stephen Hemminger wrote:
> > > 
> > > > 
> > > > Should this get fixed at kernel level, iproute2 libnetlink level or
> > > > at end-user level (e.g. collectd)?
> > > > Three lines every 10 seconds is a damn lot!
> > > > 
> > > > Thanks,
> > > > Bruno
> > > 
> > > Netlink is supposed to be encoded as Type-Length-Value and correctly written
> > > programs ignore types they don't understand. So either the library is getting
> > > confused by the type or the attribute is not encoded correctly.
> > > 
> > > 
> > > The issue could be in libnetlink library. What version of collectd and libnetlink
> > > are you using?
> > 
> > This was also reported as provoked by a client using the ntrack
> > rtnetlink code: http://thread.gmane.org/gmane.linux.network/224236

Bruno,

Can you send a full bug report to libnl@...ts.infradead.org and I'll make sure
this gets addressed in libnl.
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