See the bug lp:1927076 for recent comments/logs/findings. Shortly summarising: --- this issue can be reproduced in the following order: 1. Run the cpu-hotplug test sudo ./autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/cpu-hotplug/cpu-on-off-test.sh 2. Run the reuseport_bpf_cpu test sudo ./autotest/client/tmp/ubuntu_kernel_selftests/src/linux/tools/testing/selftests/net/reuseport_bpf_cpu ---
Seen in logs: --- [ 287.477797] Oops: Exception in kernel mode, sig: 4 [#1] --- Or: --- [ 417.696448] BUG: Unable to handle kernel instruction fetch (NULL pointer?) [ 417.696522] Faulting instruction address: 0x00000000 [ 417.696677] Oops: Kernel access of bad area, sig: 11 [#1] --- This issue can be reproduced on P8 node entei with: * F-5.4 (5.4.0-81-generic) * F-5.11 (5.11.0-27-generic #29~20.04.1-Ubuntu) * focal-hwe (Linux thiel 5.11.0-27-generic) * focal-hwe (5.11.0-34-generic) on thiel * H-5.11 (5.11.0-31-generic) * Hirsute (5.11.0-31-generic) * `gulpin` (8335-GTA) with hirsute (5.11.0-34-generic) * `entei` it is also a POWER8 (8335-GTA) with Hirsute latest kernel (5.11.0-34-generic) Looks like not reproducible on different hardware: * Power8 LPAR: P8LPAR05 MAAS * Power9: QEMU with 4 or 128 CPUs (and 4 GB of RAM) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1909286 Title: ubuntu_kernel_selftest will be interrupted with the reuseport_bpf_cpu / reuseport_bpf_numa test in net (BUG: Unable to handle kernel instruction fetch (NULL pointer?)) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1909286/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
