From mboxrd@z Thu Jan 1 00:00:00 1970 From: Brian Rak Subject: Missing IPv4 routes Date: Fri, 23 Oct 2015 17:34:11 -0400 Message-ID: <562AA7D3.9030905@vultr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit To: netdev@vger.kernel.org Return-path: Received: from mail2015.choopa.net ([208.167.225.251]:37830 "EHLO mail2015.choopa.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750714AbbJWVmw (ORCPT ); Fri, 23 Oct 2015 17:42:52 -0400 Received: from [IPv6:2001:19f0:a06:600:c00:daf7:a19c:28fd] (unknown [IPv6:2001:19f0:a06:600:c00:daf7:a19c:28fd]) by mail2015.choopa.net (Postfix) with ESMTPSA id 328345AC6396 for ; Fri, 23 Oct 2015 17:34:12 -0400 (EDT) Sender: netdev-owner@vger.kernel.org List-ID: I've got a weird situation here. I have a route that the kernel knows about, but won't display via the general RTM_GETROUTE call, but will display if I query for that particular route: # ip -4 route show | grep 108.61.171.x # ip route get 108.61.171.x 108.61.171.x dev MYIF cache # cat /proc/net/route | grep 108.61.171.x # # cat /proc/net/route | grep -i 6c3dac # # ip route add 108.61.171.x dev MYIF RTNETLINK answers: File exists # ip route del 108.61.171.x <---- it deletes successfully once # ip route del 108.61.171.x RTNETLINK answers: No such process This is on a machine running 4.1.3, but I have seen it on earlier versions in the past. I don't have great reproduction steps here, I've seen this 4-5 times in the past few months (on different hardware). So far, I haven't really found any way of fixing it (deleting and readding the route has no effect). I thought at first this might be related to e55ffaf457bcc8ec4e9d9f56f955971f834d65b3, but as far as I can tell that only relates to /proc/net/route. Any suggestions on further troubleshooting here? I'm all out of ideas (and since I can't easily reproduce it yet, I can't reboot to a newer kernel to see if it goes away)