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[Jürg Häfliger <1739560@xxxxxxxxxxxxxxxxxx>]

** Tags added: kernel-daily-bug

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https://bugs.launchpad.net/bugs/1739560

Title:
  Trusty arm64 system will hang on libhugetlbfs shmoverride_linked test

Status in ubuntu-kernel-tests:
  Invalid
Status in linux package in Ubuntu:
  Invalid

Bug description:
  Steps:
  1. Deploy an ARM64 system with Trusty
  2. Install necessary packages
  3. git clone --depth=1 -b next https://github.com/libhugetlbfs/libhugetlbfs.git
  4. make  BUILDTYPE=NATIVEONLY
  5. execute the run_test.py in tests directory

  Results:
   * you will see it stuck at shmoverride_linked test, no output for this test in syslog

  truncate_reserve_wraparound (2M: 64):	PASS
  truncate_sigbus_versus_oom (2M: 64):	PASS
  get_huge_pages (2M: 64):	PASS
  shmoverride_linked (2M: 64):

  This issue can be reproduced in 3.13.0-137 and 3.13.0-138 in proposed.
  As we didn't run any regression-test on this node between 3.13.0-135 ~ 3.13.0-136 (this node was broken).

  This test cannot be built on ARM64 before (till 3.13.0-133, we have
  changed to use the upstream repo since then) therefore I think this
  can be considered as not a regression.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-137-generic 3.13.0-137.186
  ProcVersionSignature: User Name 3.13.0-137.186-generic 3.13.11-ckt39
  Uname: Linux 3.13.0-137-generic aarch64
  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: 2.14.1-0ubuntu3.27
  Architecture: arm64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  CurrentDmesg:

  Date: Thu Dec 21 07:49:12 2017
  IwConfig:
   lo        no wireless extensions.

   enp1s0    no wireless extensions.

   enp1s0d1  no wireless extensions.
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  PciMultimedia:

  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:

  ProcKernelCmdLine: console=ttyS0,9600n8r ro
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-137-generic N/A
   linux-backports-modules-3.13.0-137-generic  N/A
   linux-firmware                              1.127.24
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  WifiSyslog:

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