openvswitch: ovs-system: deferred action limit reached, drop recirc action #153

syedammad83 · 2022-09-21T11:59:20Z

Hi,

I am using OVN 22.03 with OVS 2.17.2 on ubuntu 22.04. The OVN is integrated with OpenStack neutron and using 20.2 yoga release.

I am getting below mentioned logs in dmesg logs of gateway chassis.

[Wed Sep 21 16:54:59 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:05 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:09 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:14 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:17 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:19 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action
[Wed Sep 21 16:55:22 2022] openvswitch: ovs-system: deferred action limit reached, drop recirc action

There are alot of messages I am seeing. Digging it further the issue can be reproduced by hitting any kind of traffic to logical router's external gateway port IP address (which is SNAT IP address of router). When ever I put the SNAT IP in browser and press enter, the logs starts to show up.

Is this an issue OR will it cause any trouble in traffic ?

I am happy to provide any further details needed.

Ammad

zhanrox2 · 2022-09-23T03:20:49Z

Hi @syedammad83 , I also encountered the same problem, has your problem been solved, how to solve it.

hzhou8 · 2022-09-23T05:39:28Z

Could you provide output of ovs-appctl dpctl/dump-flows when this is happening?

hzhou8 · 2022-09-23T06:09:59Z

It seems this problem was discussed before and never resolved? https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051353.html
I also recall a problem that's fixed in OVS even earlier that had the same symptom. Not sure if it is something similar to that problem: openvswitch/ovs@29b1dd9
The DP flow output should tell more information. At the same time, it would be helpful if you could provide the NB-DB dumps and SB lflow dumps (ovn-sbctl lflow-list). ovn-trace output for the problematic trigger packet would be even better.

zhanrox2 · 2022-09-23T07:17:44Z

@hzhou8 The problem like this: #134 .
The main problem is related to TCP/UDP traffic sent to the address of an LRP port that is not part of any SNAT/DNAT conversation, it will keep recirculating in the OVS data plane until TTL is 0.
The message is shown in the kernel log due to the size of the FIFO "DEFERRED_ACTION_FIFO_SIZE", but this is a consequence of the packets not matching the flow tables of the datapath. See kernel - net/openvswitch/actions.c
Basically, it only happens when there is a SNAT rule to translate an entire network (masquerade) and the return traffic does not have an open port.

syedammad83 · 2022-10-17T11:26:12Z

flow1.txt
flow3.txt
flow2.txt

Above are the output of ovs-appctl dpctl/dump-flows | grep 175.107.193.122

I have grep my testing public IP address from dump. I have just put this IP in my browser and dumped the flows.

syedammad83 · 2022-10-17T11:57:58Z

# ovn-trace --no-friendly-names --ovs neutron-6cf49a42-ae18-4e2b-ae53-52e398025b6f 'inport == "lrp-020ebe69-fd1b-446f-8f02-29b88914184d" && ip4.dst == 175.107.193.12'
# ip,reg14=0x1,vlan_tci=0x0000,dl_src=00:00:00:00:00:00,dl_dst=00:00:00:00:00:00,nw_src=0.0.0.0,nw_dst=175.107.193.12,nw_proto=0,nw_tos=0,nw_ecn=0,nw_ttl=0

ingress(dp="d02fa4ae-8845-41e8-b65f-51ddcd4f4478", inport="lrp-020ebe69-fd1b-446f-8f02-29b88914184d")
-----------------------------------------------------------------------------------------------------
 0. lr_in_admission: no match (implicit drop) "

I am seeing nothing in ovn-trace output

@hzhou8

srelf-eschercloud · 2022-10-26T21:27:57Z

Seeing the same issue, but also could be affecting performance. Tagging myself. Please let me know if any debug info i can provide.

r-acosta · 2022-11-09T19:46:23Z

Hey folks, I also encountered the same problem - In the past with Openstack Ussuri (ovn 20.03 and ovs 2.13) and now with Openstack Yoga (ovn 22.03 and ovs 2.17). @hzhou8 <https://github.com/hzhou8>, I believe we are talking about the discussed and never resolved (SNAT/DNAT recirc issue) https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051353.html, and related issues #134 The central question seems to be understanding why the pkt doesn't match. The pkt first goes through the OVS_ACTION_ATTR_CT action, looking for conntrack/nat actions. If not found it re-injects the package skipping the first table to look for the package path (recirculation is the use of freezing to allow a frame to re-enter the datapath packet processing path to achieve more flexible packet processing), and in this case, the pkt will be placed in the queue, which has a limit of 10 (DEFERRED_ACTION_FIFO_SIZE). Some time ago I even thought about increasing this queue limit because I'm not sure about the latency effects of these recirculated packets. An important note is that this issue can only be seen on gateway nodes. Regards, Roberto

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hzhou8 · 2022-11-09T21:21:38Z

Hi folks, thanks for your valuable information! Sorry that I didn't have time to look at this recently. I will try to reproduce it locally according to what you provided, and debug it next week or so.

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: ovn-org#134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: ovn-org#153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Signed-off-by: 0-day Robot <robot@bytheb.org>

hzhou8 · 2022-12-20T00:53:51Z

PTAL: https://patchwork.ozlabs.org/project/ovn/patch/20221220000549.16922-1-hzhou@ovn.org/

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: ovn-org#134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: ovn-org#153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Signed-off-by: 0-day Robot <robot@bytheb.org>

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: ovn-org#134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: ovn-org#153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org>

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: #134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: #153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Acked-by: Dumitru Ceara <dceara@redhat.com>

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: #134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: #153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Acked-by: Dumitru Ceara <dceara@redhat.com> (cherry picked from commit 8c341b9)

hzhou8 · 2023-01-19T19:00:58Z

The above fix is merged to main and branch-22.12. Close the issue.

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: ovn-org/ovn#134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: ovn-org/ovn#153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Acked-by: Dumitru Ceara <dceara@redhat.com>

When a packet enters LR pipeline from a distributed gateway port with destination IP being a SNAT IP, it goes through the unSNAT stage and it is possible that the unSNAT fails to convert the dst IP when no conntrack entries are accociated with the packet. In this case, the packet is rerouted to the same DGP, and results in recirc loop in datapath. The packet would finally be dropped either due to ttl or the recirc limit, but it would have created unnecessary cost. To reproduce the problem, simply configure SNAT on a LR with the SNAT IP being the DGP's IP, and then send a packet from external (DGP's LS) to the SNAT IP. Kernel logs like below will be seen: openvswitch: ovs-system: deferred action limit reached, drop recirc action DP flow dump would also show plenty of flows related to this packet, each with a different ttl match, indicating the packet has been looped many times. Commit 802f927 (ovn-northd: Drop IP packets destined to router owned IPs (after NAT)) already added flows to drop packets failed unSNAT for Gateway Routers. It added flows with a low priority (2) to drop the packets that fail ARP resolve, to avoid triggering ARP request for the SNAT IPs. However, for the DGP case, to support E/W NAT, ARP resolve flows are added for thoses NAT IPs so that the packets can continue the pipeline and possibly redirect to redirect chassis. So, because of these ARP resolve flows, even the packets failed unSNAT would continue the pipeline and won't hit the low priority (2) flows, thus not get dropped. To fix the problem, for each of the ARP resolve flow added for the DGP NAT IPs, a higher priority (150) flow is added to check if the packet's inport is the DGP (same as the outport), then drop the packet directly. Test cases are updated to cover both Gateway Router and DGP scenarios, with packets from both directions (uplink and downlink). Reported-by: Krzysztof Klimonda <kklimonda@syntaxhighlighted.com> Reported-at: https://patchwork.ozlabs.org/project/ovn/patch/20210816085206.69170-1-kklimonda@syntaxhighlighted.com/ Reported-by: Frode Nordahl <frode.nordahl@canonical.com> Reported-at: https://bugs.launchpad.net/ubuntu/+source/ovn/+bug/1967718 Reported-by: Roberto Bartzen Acosta <rbartzen@gmail.com> Reported-at: #134 Reported-by: Syed Ammad Ali <syedammad83@gmail.com> Reported-at: #153 Reported-at: https://mail.openvswitch.org/pipermail/ovs-discuss/2021-August/051340.html Signed-off-by: Han Zhou <hzhou@ovn.org> Acked-by: Dumitru Ceara <dceara@redhat.com>

hzhou8 closed this as completed Jan 19, 2023

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openvswitch: ovs-system: deferred action limit reached, drop recirc action #153

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openvswitch: ovs-system: deferred action limit reached, drop recirc action #153

openvswitch: ovs-system: deferred action limit reached, drop recirc action #153

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