[Bug 2066332] Re: net:fib_rule_tests.sh in ubuntu_kselftests_net fails on Noble

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

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https://bugs.launchpad.net/bugs/2066332

Title:
net:fib_rule_tests.sh in ubuntu_kselftests_net fails on Noble

Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
New

Bug description:
In our SRU cycles, all Noble kernels fail in the aforementioned
kselftests:

11238 20:50:51 DEBUG| [stdout] # Cannot open network
namespace "testns": No such file or directory

This error is caused by the local fix added in 2019:
"UBUNTU: SAUCE: selftests: net: fix "from" match test in fib_rule_tests.sh"

It was no longer necessary because a similar fix was applied in upstream:
d1abf388604f ("selftests: fib_rule_tests: enable forwarding before ipv4 from/iif test")

However, such a Ubuntu-local commit is often blindly carried over to
future releases because nobody re-evaluates whether it is still needed
or not.

Now, it is causing a real issue on Noble kselftests.

$ linux/tools/testing/selftests/net$ sudo ./fib_rule_tests.sh
Cannot open network namespace "testns": No such file or directory

The reason for the failure is obvious; there is no such a namespace since the upstream commit 6c0ee7b4d69d ("selftests/net: convert fib_rule_tests.sh to run it in unique namespace").

Reverting the outdated commit fixes this failure.

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