Po-Hsu Lin, Thanks for the info. I was able to reproduce the issue on other 2 Power8 servers, but just running the `reuseport_bpf_cpu test` more than once (as you mentioned on comment#3). I've tested this with focal-hwe (Linux thiel 5.11.0-27-generic) and hirsute (5.11.0-31-generic). steps: 1. Run the cpu-hotplug test; 2. Run the reuseport_bpf_cpu test; 3. re-run the reuseport_bpf_cpu test.
``` thiel login: [24669.414656] Oops: Exception in kernel mode, sig: 4 [#1] [24669.414710] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV ``` ``` gulpin login: [277274.876010] Oops: Exception in kernel mode, sig: 4 [#1] [277274.876235] LE PAGE_SIZE=64K MMU=Hash SMP NR_CPUS=2048 NUMA PowerNV ``` I've also tested this 2 servers above with the upstream kernel from `https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.11.22/` I put the `reuseport_bpf_cpu test` on 20x loop and did not hit the issue, so I'd say we may have an issue with ubuntu-kernel. all 20x the test reported a success and the server did not reboot. ``` send cpu 157, receive socket 157 send cpu 159, receive socket 159 SUCCESS ``` -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. 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]) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1927076/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
