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 Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1809439 Title: cpu_hot_plug test in ubuntu_kernel_selftest failed on B s390x KVM To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu-kernel-tests/+bug/1809439/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
