This issue looks like a bug for s390x in the kernel. There are only two processors listed on this Bionic s390x KVM, not sure why it will report CPU 0-1 are in online state, 2 in offline state:
$ cat /proc/cpuinfo vendor_id : IBM/S390 # processors : 2 bogomips per cpu: 3033.00 max thread id : 0 features : esan3 zarch stfle msa ldisp eimm dfp edat etf3eh highgprs te vx facilities : 0 1 2 3 4 6 7 8 9 10 13 14 16 17 18 19 20 21 22 23 24 25 26 27 28 30 31 32 33 34 35 36 37 40 41 42 43 44 45 47 48 49 50 51 52 53 57 64 69 71 73 74 75 76 77 78 80 81 82 129 131 138 cache0 : level=1 type=Data scope=Private size=128K line_size=256 associativity=8 cache1 : level=1 type=Instruction scope=Private size=96K line_size=256 associativity=6 cache2 : level=2 type=Data scope=Private size=2048K line_size=256 associativity=8 cache3 : level=2 type=Instruction scope=Private size=2048K line_size=256 associativity=8 cache4 : level=3 type=Unified scope=Shared size=65536K line_size=256 associativity=16 cache5 : level=4 type=Unified scope=Shared size=491520K line_size=256 associativity=30 processor 0: version = FF, identification = 268F67, machine = 2964 processor 1: version = FF, identification = 268F67, machine = 2964 cpu number : 0 cpu MHz dynamic : 5000 cpu MHz static : 5000 cpu number : 1 cpu MHz dynamic : 5000 cpu MHz static : 5000 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1809439 Title: cpu_hot_plug test in ubuntu_kernel_selftest failed on B s390x KVM Status in ubuntu-kernel-tests: New Status in linux package in Ubuntu: Incomplete Bug description: $ sudo make -C linux/tools/testing/selftests TARGETS=cpu-hotplug run_tests make: Entering directory '/home/ubuntu/src/linux/tools/testing/selftests' make[1]: Entering directory '/home/ubuntu/src/linux/tools/testing/selftests/cpu-hotplug' make[1]: Nothing to be done for 'all'. make[1]: Leaving directory '/home/ubuntu/src/linux/tools/testing/selftests/cpu-hotplug' make[1]: Entering directory '/home/ubuntu/src/linux/tools/testing/selftests/cpu-hotplug' TAP version 13 selftests: cpu-on-off-test.sh ======================================== pid 18238's current affinity mask: 3 pid 18238's new affinity mask: 1 CPU online/offline summary: Cpus in online state: 0-1 Cpus in offline state: 2 Limited scope test: one hotplug cpu (leaves cpu in the original state): online to offline to online: cpu 1 offline to online to offline: cpu 2 ./cpu-on-off-test.sh: line 85: /sys/devices/system/cpu/cpu2/online: No such file or directory online_cpu_expect_success 2: unexpected fail not ok 1..1 selftests: cpu-on-off-test.sh [FAIL] make[1]: Leaving directory '/home/ubuntu/src/linux/tools/testing/selftests/cpu-hotplug' make: Leaving directory '/home/ubuntu/src/linux/tools/testing/selftests' ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-43-generic 4.15.0-43.46 ProcVersionSignature: Ubuntu 4.15.0-43.46-generic 4.15.18 Uname: Linux 4.15.0-43-generic s390x NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair AlsaDevices: Error: command ['ls', '-l', '/dev/snd/'] failed with exit code 2: ls: cannot access '/dev/snd/': No such file or directory AplayDevices: Error: [Errno 2] No such file or directory: 'aplay': 'aplay' ApportVersion: 2.20.9-0ubuntu7.5 Architecture: s390x ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord': 'arecord' CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found. CurrentDmesg: Date: Fri Dec 21 10:38:05 2018 HibernationDevice: RESUME=UUID=caaee9b2-6bc1-4c8e-b26c-69038c092091 IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig': 'iwconfig' Lspci: Lsusb: Error: command ['lsusb'] failed with exit code 1: PciMultimedia: ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb' ProcKernelCmdLine: root=UUID=c7d7bbcb-a039-4ead-abfe-7672dea0add4 crashkernel=196M RelatedPackageVersions: linux-restricted-modules-4.15.0-43-generic N/A linux-backports-modules-4.15.0-43-generic N/A linux-firmware 1.173.2 RfKill: Error: [Errno 2] No such file or directory: 'rfkill': 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1809439/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
