I can reproduce this with 4.15.0-76-generic, 4.15.0-88-generic X-hwe on P8 node modoc as well.
It's weird because according to the test history, this issue does not exist back in times.
Attachment is the test old test history for 4.15.0-88-generic X-hwe modoc, the reuseport_bpf_cpu passed there.
I can reproduce this with 4.15.0-76-generic, 4.15.0-88-generic X-hwe on P8 node modoc as well.
It's weird because according to the test history, this issue does not exist back in times.
Attachment is the test old test history for 4.15.0-88-generic X-hwe modoc, the reuseport_bpf_cpu passed there.