This issue can be found on F-AWS 5.13.0-1008.9~20.04.2 with instance c6g.8xlarge, it's a bit flaky on it.
Running tests....... Name: cpuhotplug03 Date: Thu Dec 23 09:14:59 UTC 2021 Desc: Do tasks get scheduled to a newly on-lined CPU? CPU is 1 USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 758483 0.0 0.0 2052 516 ? R 09:14 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop root 758484 0.0 0.0 2052 480 ? R 09:14 0:00 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop ... 3 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop 21 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop 21 /bin/sh /opt/ltp/testcases/bin/cpuhotplug_do_spin_loop cpuhotplug03 1 TFAIL: No cpuhotplug_do_spin_loop processes found on CPU1 INFO: ltp-pan reported some tests FAIL LTP Version: 20210927 INFO: Test end time: Thu Dec 23 09:15:01 UTC 2021 ** Tags added: 5.13 sru-20211129 -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1931390 Title: cpuhotplug03 in cpuhotplug from ubuntu_ltp failed after successful CPU1 offline To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1931390/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs