Can you repeat tests with latest kernels? I could not reproduce it on Focal 
with following configurations:
1. Power8: P8LPAR05 MAAS
2. Power9: QEMU with 4 or 128 CPUs (and 4 GB of RAM)

Tested kernels:
F/5.4.0-84-generic
F/5.11.0-34-generic

Tried steps:
1. Freshly boot machine.
2. Log in via ssh.
3. sudo 
./autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh

4. for i in `seq 100`; do echo $i ; sleep 2 ; sudo
./autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/reuseport_bpf_cpu
; done

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https://bugs.launchpad.net/bugs/1927076

Title:
  IPv6 TCP in reuseport_bpf_cpu from ubuntu_kernel_selftests/net crash
  P8 node entei on 5.8 kernel (Oops: Exception in kernel mode, sig: 4
  [#1])

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