colin-king, the name of your system (s2lp3) lets me assume that you are running 
Ubuntu on LPAR rather than on z/VM.
I assume (and according to the title) this issue is on z/VM guests (only?).

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https://bugs.launchpad.net/bugs/1744270

Title:
  ubuntu_lttng_smoke_test failed on Xenial zVM

Status in linux package in Ubuntu:
  In Progress

Bug description:
  This test failed with the proposed Xenial kernel 4.4.0-111.134 on zVM

  It's not a regression since this can be reproduced with the older
  4.4.0-108 on the very same node.

  Command returned non-zero exit status
    * Command:
        
/home/ubuntu/autotest/client/tests/ubuntu_lttng_smoke_test/ubuntu_lttng_s
        moke_test.sh
    Exit status: 1
    Duration: 0.447135210037

    stdout:
    == lttng smoke test of session create/destroy ==
    Spawning a session daemon
    Session test-kernel-session created.
    Traces will be written in /tmp/lttng-kernel-trace-32862-session
    PASSED (lttng create)
    Session test-kernel-session destroyed
    PASSED (lttng destroy)

    == lttng smoke test list kernel events ==
    FAILED (lttng list --kernel)
    FAILED (lttng list --kernel more output expected)

    lttng smoke test trace open/close system calls SKIPPED for s390x

    == lttng smoke test trace context switches ==
    Session test-kernel-session created.
    Traces will be written in /tmp/lttng-kernel-trace-32862-session
    PASSED (lttng create)
    FAILED (lttng enable-event)
    Session test-kernel-session destroyed

    Summary: 3 passed, 3 failed
    stderr:
    Error: Unable to list kernel events: Kernel tracer not available
    Error: Command error
    Error: Event sched_switch: Kernel tracer not available (channel channel0, 
session test-kernel-session)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-111-generic 4.4.0-111.134
  ProcVersionSignature: Ubuntu 4.4.0-111.134-generic 4.4.98
  Uname: Linux 4.4.0-111-generic s390x
  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'
  ApportVersion: 2.20.1-0ubuntu2.15
  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.
  CurrentDmesg:

  Date: Fri Jan 19 05:11:39 2018
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lspci:

  Lsusb: Error: command ['lsusb'] failed with exit code 1:
  PciMultimedia:

  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=C
   SHELL=/bin/bash
  ProcFB: Error: [Errno 2] No such file or directory: '/proc/fb'
  ProcKernelCmdLine: root=UUID=44b0b919-a1a4-4849-9425-e71d4ac87d85 
crashkernel=196M  nogmb BOOT_IMAGE=0
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-111-generic N/A
   linux-backports-modules-4.4.0-111-generic  N/A
   linux-firmware                             1.157.15
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)

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