This issue has been addressed by Colin's commit:

We could expect that to land on the upstream branch in the future as

** Changed in: ubuntu-kernel-tests
       Status: New => Fix Released

** Changed in: ubuntu-kernel-tests
     Assignee: (unassigned) => Colin Ian King (colin-king)

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  cpu_hot_plug test in ubuntu_kernel_selftest failed on X/B/C s390x KVM

Status in ubuntu-kernel-tests:
  Fix Released
Status in linux package in Ubuntu:

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 
  make[1]: Nothing to be done for 'all'.
  make[1]: Leaving directory 
  make[1]: Entering directory 
  TAP version 13
  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
  ./ 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: [FAIL]
  make[1]: Leaving directory 
  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': 
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 
not found.
  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'
  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=c7d7bbcb-a039-4ead-abfe-7672dea0add4 
   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)

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