------- Comment From [email protected] 2026-11-05 05:13 EDT------- Hi Canonical, here are the verification results on Resolute from Jan that he already did two weeks ago. His comment with the results was accidentally not mirrored to Launchpad when Jan posted it, therefore I am re-posting his comment. Sorry for the delay.
============================================================================ Verification performed by Jan on b46lp08: - OS: Ubuntu 26.04.1 LTS (Resolute), s390x - Kernel tested: 7.0.0-39-generic - Bug: LP#2165732 / LTC BZ#222376 - Upstream fix: 337bd95507a16063687cfc286ea90de5cca48c37 "s390/cpumf: Install CPU hotplug handler" CPU 1 was brought offline and back online during an active perf stat session running stress-ng: echo 0 > /sys/devices/system/cpu/cpu1/online perf stat -e cycles -i -- \ stress-ng --timeout 10s --matrix 1 & sleep 1 echo 1 > /sys/devices/system/cpu/cpu1/online wait Result: PASS - CPU 1 was successfully brought back online. - stress-ng completed successfully with no failed stressors. - perf stat exited with status 0. - perf reported 24,554,097 cycles. - No panic, oops, BUG, call trace, or CPUMF error was found in dmesg. The fix is successfully verified for Resolute with kernel 7.0.0-39-generic. The additionally requested AWS and Azure kernel flavours are not available in our s390x environment and could therefore not be tested. ============================================================================ -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2165732 Title: [UBUNTU 24.04] kernel: CPU hotplug unsupported by CPUMF To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-z-systems/+bug/2165732/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
