Thanks Ihar, I've just reported this as you suggested:
https://bugzilla.redhat.com/show_bug.cgi?id=1193429

Le Tue Feb 17 2015 at 11:03:23, Ihar Hrachyshka <ihrachys@redhat.com> a écrit :

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On 02/16/2015 03:39 PM, Madko wrote:
> Hi,
>
> we have a lot of flood in the logs about "failed to flow_del".
>
> /var/log/openvswitch/ovs-vswitchd.log-20150215:2015-02-13T17:43:54.555Z|00011|dpif(revalidator_7)|WARN|system@ovs-system:
>
>
failed to flow_del (No such file or directory)
> skb_priority(0),in_port(6),skb_mark(0),eth(src=00:1a:a0:28:ca:cc,dst=ff:ff:ff:ff:ff:ff),eth_type(0x8100),vlan(vid=4001,pcp=0),encap(eth_type(0x0806),arp(sip=10.156.29.184,tip=10.156.20.110,op=1,sha=00:1a:a0:28:ca:cc,tha=00:00:00:00:00:00))
>
>  Seems ubuntu has same bug :
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1408972
>
> We are using kernel 3.10.0-123.20.1.el7.x86_64 and
> openvswitch-2.1.2-2.el7.centos.1.x86_64
>
> Is it a known bug on RDO?

Brief search thru the web shows that it's a known issue and was fixed
in OVS as of https://github.com/openvswitch/ovs/commit/3601bd879 that
is included in 2.1.3. I guess the commit was not backported to EL7
package, hence the error.

You can report a bug against RDO to track the backport and/or version
bump for OVS.

/Ihar
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