[Bug 1891421] Re: kci_test_encap_fou() in rtnetlink.sh from kselftests/net failed with "FAIL: can't add fou port 7777, skipping test"

Failed on Bionic/oracle : 5.4.0-1026.26~18.04.1 : amd64

** Tags added: oracle

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https://bugs.launchpad.net/bugs/1891421

Title:
kci_test_encap_fou() in rtnetlink.sh from kselftests/net failed with
"FAIL: can't add fou port 7777, skipping test"

Status in ubuntu-kernel-tests:
In Progress
Status in linux package in Ubuntu:
Confirmed
Status in linux source package in Bionic:
Confirmed
Status in linux source package in Focal:
Confirmed

Bug description:
The kci_test_encap_fou() from kci_test_encap() in rtnetlink.sh of kselftests/net will fail with non-zero return value, and print:
  "FAIL: can't add fou port 7777, skipping test"

How to reproduce this:
 devdummy="test-dummy0"
 testns="testns"
 ip netns add "$testns"
 ip netns exec "$testns" ip link set lo up
 ip netns exec "$testns" ip link add name "$devdummy" type dummy
 ip netns exec "$testns" ip link set "$devdummy" up
 ip netns exec "$testns" ip fou add port 7777 ipproto 47
RTNETLINK answers: No such file or directory
Error talking to the kernel

This is not a regression, it's the real test result after bug 1890136
has been fixed.

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