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[Workaround] EvpnRemoteVnip2pOrch warmboot check failure #2626

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merged 3 commits into from
Feb 13, 2023
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[Workaround] EvpnRemoteVnip2pOrch warmboot check failure #2626

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fe0e09b
fix p2p vxlan warmboot check failure
Jan 19, 2023
cbe9897
fix comments
Feb 7, 2023
b664dc0
fix format issue
Feb 8, 2023
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8 changes: 8 additions & 0 deletions orchagent/vxlanorch.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -2347,6 +2347,14 @@ bool EvpnRemoteVnip2pOrch::addOperation(const Request& request)
return true;
}

EvpnNvoOrch* evpn_orch = gDirectory.get<EvpnNvoOrch*>();
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auto vtep_ptr = evpn_orch->getEVPNVtep();
if (!vtep_ptr) {
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Please follow convention. { -> new line

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Sure, will update in latest diff.

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updated.

SWSS_LOG_WARN("Remote VNI add: Source VTEP not found. remote=%s vid=%d",
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What does this log say during warm boot ? Does it point to anything valid ?
ie what is the remote ip and what is the vid ?
If it is some spurious data then we need to investigate that as this can be seen on any of the other tables in other OAs.

Quite clearly the null check cannot be the fix especially in a non EVPN scenario.
We would need to see why is this being called when there is no explanation for the presence of an entry in the VXLAN_REMOTE_VNI table.

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@jcaiMR jcaiMR Feb 1, 2023 •
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@jcaiMR @prsunny Do we know why EvpnRemoteVnip2pOrch::addOperation is called in non EVPN scenario. This will generally be called when VXLAN_REMOTE_VNI table is present. Is it populated in non evpn scenario?

Yes, the issue happened in non-evpn scenario, seems in function OrchDaemon::init(), we directly create evpn_remote_vni_orch and push into m_orchList.

 if (vxlan_tunnel_orch->isDipTunnelsSupported())
    {
        EvpnRemoteVnip2pOrch* evpn_remote_vni_orch = new EvpnRemoteVnip2pOrch(m_applDb, APP_VXLAN_REMOTE_VNI_TABLE_NAME);
        gDirectory.set(evpn_remote_vni_orch);
        m_orchList.push_back(evpn_remote_vni_orch);
    }
    else
    {
        EvpnRemoteVnip2mpOrch* evpn_remote_vni_orch = new EvpnRemoteVnip2mpOrch(m_applDb, APP_VXLAN_REMOTE_VNI_TABLE_NAME);
        gDirectory.set(evpn_remote_vni_orch);
        m_orchList.push_back(evpn_remote_vni_orch);
    }

And warmboot check function OrchDaemon::warmRestartCheck( ) checked all orch agents in m_orchList, and finally call addOperation() for each orch agent. I didn't find any check logic for VXLAN_REMOTE_VNI table before walking orch agent list, Do I missed something ?
attached some trace during warmboot:

Thread 1 "orchagent" hit Breakpoint 1, EvpnRemoteVnip2mpOrch::addOperation (this=0x55ecbd1e7af0, request=...) at vxlanorch.cpp:2476
2476    vxlanorch.cpp: No such file or directory.
(gdb) bt
#0  EvpnRemoteVnip2mpOrch::addOperation (this=0x55ecbd1e7af0, request=...) at vxlanorch.cpp:2476
#1  0x000055ecbb8d1c60 in Orch2::doTask (this=0x55ecbd1e7af0, consumer=...) at orch.cpp:1063
#2  0x000055ecbb8d5a9e in Consumer::drain (this=0x55ecbd1e85b0) at orch.cpp:241
#3  Consumer::drain (this=0x55ecbd1e85b0) at orch.cpp:238
#4  Consumer::execute (this=0x55ecbd1e85b0) at orch.cpp:235
#5  0x000055ecbb8c54c9 in OrchDaemon::start (this=this@entry=0x55ecbd0bfd80) at orchdaemon.cpp:755
#6  0x000055ecbb843fe0 in main (argc=<optimized out>, argv=<optimized out>) at main.cpp:735
(gdb) c

Having the p2premotevniorch in the orchList does not explain why there was an event. Could you dump the contents of the VXLAN_REMOTE_VNI table before the WB command is issued ? Does it have any entries ?

keys VXLAN_REMOTE_VNI

Thanks for comments. we don't have EVPN configured and "sonic-db-cli APPL_DB keys "VXLAN_REMOTE_VNI*"" is empty.
image

Do you mean if VXLAN_REMOTE_VNI table is not exists, there will no event to trigger EvpnRemoteVnip2pOrch/EvpnRemoteVnip2mpOrch addOperation ? Then here seems we need dig more to see what kind of events from Consumer table right ?

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yes addOperation cannot be called unless the VXLAN_REMOTE_VNI table is populated.

My understanding is that warmRestartCheck will not call addOperation.
It just checks the sizes of the m_toSync map and if it is non zero then returns a false.

So one possible explanation is there was an earlier operation which resulted in the VXLAN_REMOTE_VNI being populated and resulting in a failure that you saw.
Under valid EVPN VXLAN configuration one is not expected to see this failure.

WB operation later on results in the readiness check failing.

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Thanks for suggestion, will have some further debug to find the event trigger.

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@srj102 I agree with your comments. However, I think we need to include this work-around for the short term. @jcaiMR please leave the issue open after this PR merged. (remove the fix PR comment).

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Got it, have modified the title and removed Fix #. Will use other PR for the root cause solution.

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@srj102 are you ok to remove the blocker on this PR?

remote_vtep.c_str(), vlan_id);
return true;
}

VxlanTunnelOrch* tunnel_orch = gDirectory.get<VxlanTunnelOrch*>();
Port tunnelPort, vlanPort;

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