Comment 0 for bug 2039816

Issue found on ARM64 node scobee-kernel with:
 * J-5.15.0-86.95 lowlatency
 * 5.15.0-85.95~20.04.2 generic
 * F-5.15.0-86.95~20.04.1 lowlatency
 * F-5.15.0-87.96~20.04.1 lowlatency-64k

Test failed with:
$ sudo ./vrf-xfrm-tests.sh

No qdisc on VRF device
TEST: IPv4 no xfrm policy [ OK ]
TEST: IPv6 no xfrm policy [ OK ]
TEST: IPv4 xfrm policy based on address [FAIL]
TEST: IPv6 xfrm policy based on address [FAIL]
TEST: IPv6 xfrm policy with VRF in selector [ OK ]
TEST: IPv4 xfrm policy with xfrm device [FAIL]
TEST: IPv6 xfrm policy with xfrm device [FAIL]

netem qdisc on VRF device
TEST: IPv4 no xfrm policy [ OK ]
TEST: IPv6 no xfrm policy [ OK ]
TEST: IPv4 xfrm policy based on address [FAIL]
TEST: IPv6 xfrm policy based on address [FAIL]
TEST: IPv6 xfrm policy with VRF in selector [ OK ]
TEST: IPv4 xfrm policy with xfrm device [FAIL]
TEST: IPv6 xfrm policy with xfrm device [FAIL]

Tests passed: 6
Tests failed: 8

And this issue does not exist with the following combination:
* F-generic-5.15.0-86.96~20.04.1 howzit-kernel
* F-generic-5.15.0-86.96~20.04.1 wright-kernel
* F-generic-64k-5.15.0-85.95~20.04.2 kopter-kernel
* F-lowlatency-5.15.0-88.98~20.04.1 howzit-kernel
* F-lowlatency-5.15.0-85.94 starmie-kernel
* F-lowlatency-64k-5.15.0-85.94~20.04.1 howzit-kernel
* J-lowlatency-64k-5.15.0-85.94 starmie-kernel
* J-lowlatency-64k-5.15.0-86.95 howzit-kernel

So it looks like hardware related.

And the cause seems to be commit cb43c60 (" selftests: net: vrf-xfrm-tests: change authentication and encryption algos"), which lands on the Jammy tree since:
 * Ubuntu-5.15.0-85.95
 * Ubuntu-lowlatency-5.15.0-85.94

With this commit reverted, this test can pass on node scobee-kernel with 5.15.0-87-lowlatency-64k