[Bug 1818238] Re: fib_tests.sh net selftest is flaky when running carrier tests

For some reason, I can't really reproduce the failure on cosmic 4.18
kernel, only on 5.0.

Cascardo.

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https://bugs.launchpad.net/bugs/1818238

Title:
fib_tests.sh net selftest is flaky when running carrier tests

Status in linux package in Ubuntu:
Incomplete

Bug description:
[Impact]
The kernel net selftests include a fib_rules.sh that tests fib rules after carrier off. That test is flaky, which will cause false failures during ADT and SRU tests.

[Test case]
The carrier test has been run on a loop and the failure was noticed. After the fix, the failure does not appear.

[Regression potential]
This fix only applies to the selftests, not the kernel itself. The regression potential would be tests failing when they were not, but no regressions to users themselves.

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