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Warning Messages for 1.8.0-rc2: Unable to flush Cilium iptables chain #11809

@zbindenren

Description

@zbindenren

Bug report

General Information

  • Cilium version:
Client: 1.8.0-rc2 ce5852475 2020-05-29T21:53:07+02:00 go version go1.14.3 linux/amd64
Daemon: 1.8.0-rc2 ce5852475 2020-05-29T21:53:07+02:00 go version go1.14.3 linux/amd64
  • Kernel version:
5.7.0-1.el7.elrepo.x86_64
  • Orchestration system version in use:
erver Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.2", GitCommit:"52c56ce7a8272c798dbc29846288d7cd9fbae032", GitTreeState:"clean", BuildDate:"2020-04-16T11:48:36Z", GoVersion:"go1.13.9", Compiler:"gc", Platform:"linux/amd64"}

How to reproduce the issue

On startup we get the following warning messages:

level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter -F CILIUM_INPUT]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter -X CILIUM_INPUT]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter -F CILIUM_OUTPUT]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter -X CILIUM_OUTPUT]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t raw -F CILIUM_OUTPUT_raw]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t raw -X CILIUM_OUTPUT_raw]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -F CILIUM_POST_nat]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -X CILIUM_POST_nat]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -F CILIUM_OUTPUT_nat]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -X CILIUM_OUTPUT_nat]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -F CILIUM_PRE_nat]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t nat -X CILIUM_PRE_nat]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t mangle -F CILIUM_POST_mangle]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t mangle -X CILIUM_POST_mangle]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t mangle -F CILIUM_PRE_mangle]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t mangle -X CILIUM_PRE_mangle]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t raw -F CILIUM_PRE_raw]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t raw -X CILIUM_PRE_raw]" subsys=iptables
level=warning msg="Unable to flush Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter -F CILIUM_FORWARD]" subsys=iptables
level=warning msg="Unable to delete Cilium iptables chain" error="exit status 1" obj="[-w 5 -t filter

This only happens after a system reboot. If I delete the pod I do not have such warning messages.

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