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

** Also affects: linux-oem-5.6 (Ubuntu)
Importance: Undecided
Status: New

** Also affects: linux-oem-osp1 (Ubuntu)
Importance: Undecided
Status: New

** Also affects: linux (Ubuntu Groovy)
Importance: Undecided
Status: New

** Also affects: linux-oem-osp1 (Ubuntu Groovy)
Importance: Undecided
Status: New

** Also affects: linux-oem-5.6 (Ubuntu Groovy)
Importance: Undecided
Status: New

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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-oem-5.6 package in Ubuntu:
New
Status in linux-oem-osp1 package in Ubuntu:
New
Status in linux source package in Bionic:
Confirmed
Status in linux-oem-5.6 source package in Bionic:
New
Status in linux-oem-osp1 source package in Bionic:
New
Status in linux source package in Focal:
Confirmed
Status in linux-oem-5.6 source package in Focal:
New
Status in linux-oem-osp1 source package in Focal:
New
Status in linux source package in Groovy:
New
Status in linux-oem-5.6 source package in Groovy:
New
Status in linux-oem-osp1 source package in Groovy:
New

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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