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IDProjectCategoryView StatusLast Update
0018065CentOS-8kernelpublic2021-02-12 13:36
Reportergzohop Assigned To 
PrioritynormalSeveritymajorReproducibilityalways
Status newResolutionopen 
Platformx86_64OSCentos 8OS VersionCentOS Linux rel
Product Version8.3.2011 
Summary0018065: Docker swarm overlay network not working on kernel version 4.18.0-240.10.1.el8_3
DescriptionAfter upgrade to kernel version 4.18.0-240.10.1.el8_3, overlay network stops working.
Just ping packets seem to work ok:

16:35:55.634830 IP 10.156.105.15.44774 > 10.156.105.13.4789: VXLAN, flags [I] (0x08), vni 4098
IP 10.0.2.74 > 10.0.2.63: ICMP echo request, id 25, seq 1370, length 64
16:35:55.634840 IP 10.156.105.13.39686 > 10.156.105.15.4789: VXLAN, flags [I] (0x08), vni 4098
IP 10.0.2.63 > 10.0.2.74: ICMP echo reply, id 25, seq 1368, length 64


Other traffic looks like this on that VM:

16:33:21.734503 IP 10.156.105.15.41381 > 10.156.105.13.4789: VXLAN, flags [I] (0x08), vni 4098
IP 10.0.2.74.41196 > 10.0.2.63.8080: Flags [S], seq 1098606349, win 28200, options [mss 1410,sackOK,TS val 1616949364 ecr 0,nop,wscale 7], length 0
16:33:22.749372 IP 10.156.105.15.33884 > 10.156.105.13.4789: VXLAN, flags [I] (0x08), vni 4098
IP 10.0.2.74.41196 > 10.0.2.63.8080: Flags [S], seq 1098606349, win 28200, options [mss 1410,sackOK,TS val 1616950378 ecr 0,nop,wscale 7], length 0
16:33:24.797371 IP 10.156.105.15.57394 > 10.156.105.13.4789: VXLAN, flags [I] (0x08), vni 4098
IP 10.0.2.74.41196 > 10.0.2.63.8080: Flags [S], seq 1098606349, win 28200, options [mss 1410,sackOK,TS val 1616952426 ecr 0,nop,wscale 7], length 0
16:33:28.829381 IP 10.156.105.15.39480 > 10.156.105.13.4789: VXLAN, flags [I] (0x08), vni 4098

But that traffic is not leaving network interface.
(capture on vmware vswitch in promiscuous mode does not see that traffic, and it does capture on kernel version 4.18.0-193.6.3.el8_2.x86_64)

After downgrade to kernel version 4.18.0-193.6.3.el8_2.x86_64 traffic is working fine.
Steps To ReproduceUpdate kernel on one node of docker swarm from version 4.18.0-193.6.3.el8_2.x86_64 to 4.18.0-240.10.1.el8_3.
After upgrade any traffic other than icmp ping stops working from that node, downgrading fixes problem.
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Issue History

Date Modified Username Field Change
2021-02-12 13:36 gzohop New Issue