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[Michael Kaiser <1570503@xxxxxxxxxxxxxxxxxx>]

Update: I found that I can reliably reproduce the failure by running

stress --vm-bytes $(awk '/MemFree/{printf "%d\n", $2 * 0.9;}' <
/proc/meminfo)k --vm-keep -m 1

and then trying to hibernate. So I did a git bisect between
Ubuntu-4.2.0-34.39 and Ubuntu-4.2.0-35.40 and identified this commit[0]
as the one that introduced the problem.

[0] http://kernel.ubuntu.com/git/ubuntu/ubuntu-
wily.git/commit/?id=292d352640b677d473fbd9e13c63a0826fafa2a8

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https://bugs.launchpad.net/bugs/1570503

Title:
  Computer freezes on hibernate

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Since version 4.2.0-35 hibernation fails when there's significant RAM
  usage, like running google chrome with tens of open tabs. The screen
  will turn dark, display goes to sleep mode, but the computer just
  hangs and doesn't power off. (I am still able to ping the machine, but
  can't ssh in for example). When I reset the machine, it will just boot
  normally instead of resuming. The problem doesn't show when there's
  low RAM usage (like, just hibernating from an empty desktop) and it
  doesn't show when running 4.2.0-34.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-35-generic 4.2.0-35.40
  ProcVersionSignature: Ubuntu 4.2.0-35.40-generic 4.2.8-ckt5
  Uname: Linux 4.2.0-35-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Apr 14 19:25:09 2016
  HibernationDevice: RESUME=/dev/mapper/swap
  InstallationDate: Installed on 2015-05-11 (339 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  IwConfig:
   eth0      no wireless extensions.
   
   docker0   no wireless extensions.
   
   lo        no wireless extensions.
  ProcEnviron:
   TERM=screen-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/usr/bin/zsh
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-35-generic root=UUID=7612132b-8a66-4416-89e1-ac334e9dee91 ro rootflags=subvol=@
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-35-generic N/A
   linux-backports-modules-4.2.0-35-generic  N/A
   linux-firmware                            1.149.3
  RfKill:
   0: hci0: Bluetooth
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-05 (161 days ago)
  dmi.bios.date: 08/23/2011
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: BLH6710H.86A.0128.2011.0823.1224
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: DH67BL
  dmi.board.vendor: Intel Corporation
  dmi.board.version: AAG10189-207
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrBLH6710H.86A.0128.2011.0823.1224:bd08/23/2011:svn:pn:pvr:rvnIntelCorporation:rnDH67BL:rvrAAG10189-207:cvn:ct3:cvr:

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