On Wed, Aug 4, 2021 at 4:17 AM Krzysztof Klimonda <kklimo...@syntaxhighlighted.com> wrote: > > Hi Ammad, > > (Re-adding ovs-discuss@openvswitch.org to CC to keep track of the discussion) > > Thanks for testing it with SNAT enabled/disabled and verifying that it seems > to be related. > > As for the impact of this bug I have to say I'm unsure. I have theorized that > this could the cause for (or at least connected to) BFD sessions being > dropped between gateway chassises, but I couldn't really validate it. > > My linked patch is pretty old and no longer applies cleanly on master, but > I'd be interested in getting some feedback from developers on whether I'm > even fixing the right thing.
Hi Krzysztof, Your patch is in the "change requested" stage. I see from the comment that the ddlog part of the code is missing. Seems like a valid case to me. The issue is seen when the packet is destined to the router port IP right ? In the case of ovn-kubernetes, the router port IP is also used as a load balancer backend IP. Will your patch have any impact if the logical router has this load balancer configured ? (for the system test case you've added ) ovn-nbctl lb-add lb1 172.16.1.254:90 192.168.1.100:90 ovn-nbctl lr-lb-add R1 lb1 Can you please repost the patch for further review. It would be great if you can add ddlog code. Or you can repost the patch and the ddlog part can be added if the reviewers are fine with the patch. Thanks Numan > > Regards, > Krzysztof > > On Wed, Aug 4, 2021, at 09:02, Ammad Syed wrote: > > I am able to reproduce this issue with snat enabled network and > > accessing the snat IP from external network can reproduce this issue . > > If I keep snat disable, then I didn't see these logs in syslog. > > > > Ammad > > > > On Tue, Aug 3, 2021 at 6:39 PM Ammad Syed <syedamma...@gmail.com> wrote: > > > Thanks. Let me try to reproduce it with this way. > > > > > > Can you please advise if this will cause any trouble if we have this bug > > > in production? Any workaround to avoid this issue? > > > > > > Ammad > > > > > > On Tue, Aug 3, 2021 at 5:56 PM Krzysztof Klimonda > > > <kklimo...@syntaxhighlighted.com> wrote: > > >> Hi, > > >> > > >> To reproduce it (on openstack. although the issue does not seem to be > > >> openstack-specific) I've created a network with SNAT enabled (which is > > >> default) and set its external gateway to my external network. Next, I've > > >> tried establishing TCP session from the outside to IP address assigned > > >> to the router and checked dmesg on the chassis that the port is assigned > > >> to for "ovs-system: deferred action limit reached, drop recirc action" > > >> messages. > > >> > > >> Best Regards, > > >> Krzysztof > > >> > > >> On Tue, Aug 3, 2021, at 09:05, Ammad Syed wrote: > > >> > Hi Krzysztof, > > >> > > > >> > Yes I might be stuck in this issue. How can I check if there is any > > >> > loop in lflow-list ? > > >> > > > >> > Ammad > > >> > > > >> > On Tue, Aug 3, 2021 at 2:14 AM Krzysztof Klimonda > > >> > <kklimo...@syntaxhighlighted.com> wrote: > > >> > > Hi, > > >> > > > > >> > > Not sure if it's related, but I've seen this bug in ovn 20.12 > > >> > > release, where routing loop was related to flows created to handle > > >> > > SNAT, I've sent an RFC patch few months back but didn't really have > > >> > > time to follow up on it since then to get some feedback: > > >> > > https://www.mail-archive.com/ovs-dev@openvswitch.org/msg53195.html > > >> > > I was planning on re-testing it with 21.06 release and follow up on > > >> > > the patch. > > >> > > > > >> > > On Mon, Aug 2, 2021, at 21:31, Han Zhou wrote: > > >> > > > > > >> > > > > > >> > > > On Mon, Aug 2, 2021 at 5:07 AM Ammad Syed <syedamma...@gmail.com> > > >> > > > wrote: > > >> > > > > > > >> > > > > Hello, > > >> > > > > > > >> > > > > I am using openstack with OVN 20.12 and OVS 2.15.0 on ubuntu > > >> > > > > 20.04. I am using geneve tenant network and vlan provider > > >> > > > > network. > > >> > > > > > > >> > > > > I am continuously getting below messages in my dmesg logs > > >> > > > > continuously on compute node 1 only the other two compute nodes > > >> > > > > have no such messages. > > >> > > > > > > >> > > > > [275612.826698] openvswitch: ovs-system: deferred action limit > > >> > > > > reached, drop recirc action > > >> > > > > [275683.750343] openvswitch: ovs-system: deferred action limit > > >> > > > > reached, drop recirc action > > >> > > > > [276102.200772] openvswitch: ovs-system: deferred action limit > > >> > > > > reached, drop recirc action > > >> > > > > [276161.575494] openvswitch: ovs-system: deferred action limit > > >> > > > > reached, drop recirc action > > >> > > > > [276210.262524] openvswitch: ovs-system: deferred action limit > > >> > > > > reached, drop recirc action > > >> > > > > > > >> > > > > I have tried by reinstalling (OS everything) compute node 1 but > > >> > > > > still having same errors. > > >> > > > > > > >> > > > > Need your advise. > > >> > > > > > > >> > > > > -- > > >> > > > > Regards, > > >> > > > > > > >> > > > > > > >> > > > > Syed Ammad Ali > > >> > > > > _______________________________________________ > > >> > > > > discuss mailing list > > >> > > > > disc...@openvswitch.org > > >> > > > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > > >> > > > > > >> > > > Hi Syed, > > >> > > > > > >> > > > Could you check if you have routing loops (i.e. a packet being > > >> > > > routed > > >> > > > back and forth between logical routers infinitely) in your logical > > >> > > > topology? > > >> > > > > > >> > > > Thanks, > > >> > > > Han > > >> > > > _______________________________________________ > > >> > > > discuss mailing list > > >> > > > disc...@openvswitch.org > > >> > > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > > >> > > > > > >> > > > > >> > > > > >> > > -- > > >> > > Krzysztof Klimonda > > >> > > kklimo...@syntaxhighlighted.com > > >> > > _______________________________________________ > > >> > > discuss mailing list > > >> > > disc...@openvswitch.org > > >> > > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > > >> > > > >> > > > >> > -- > > >> > Regards, > > >> > > > >> > > > >> > Syed Ammad Ali > > >> > > >> > > >> -- > > >> Krzysztof Klimonda > > >> kklimo...@syntaxhighlighted.com > > > -- > > > Regards, > > > > > > > > > Syed Ammad Ali > > > > > > -- > > Regards, > > > > > > Syed Ammad Ali > > > -- > Krzysztof Klimonda > kklimo...@syntaxhighlighted.com > _______________________________________________ > discuss mailing list > disc...@openvswitch.org > https://mail.openvswitch.org/mailman/listinfo/ovs-discuss > _______________________________________________ discuss mailing list disc...@openvswitch.org https://mail.openvswitch.org/mailman/listinfo/ovs-discuss
