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fence[12] = 07800131
  fence[13] = 03000441
  fence[14] = 07400131
  fence[15] = 00000000
  INSTDONE_0: 0x7fffffc1
  INSTDONE_1: 0x00000000
  INSTDONE_2: 0x00000000
  INSTDONE_3: 0x00000000
render command stream:
  START: 0x0012c000
  HEAD:  0x0c40da00
  TAIL:  0x0000da68
  CTL:   0x0001f001
  HWS:   0x00000000
  ACTHD: 0x00000000 01b000ec
  IPEIR: 0x00000000
  IPEHR: 0x05800000
  INSTDONE: 0x7fffffc1
  INSTPM: 0x00000800
  FADDR: 0x00000000 01b00880
  seqno: 0x0004dab2
  waiting: yes
  ring->head: 0x0001fef8
  ring->tail: 0x0000da68
  hangcheck: hung [40]
vm[0]
  Active [14]:
    01b00000    16384 7e 00 [ 4dab3 00 00 00 00 ] 00 dirty uncached
    02000000     4096 7e 00 [ 4dab4 00 00 00 00 ] 00 dirty uncached
    04800000  7798784 76 00 [ 4dab4 00 00 00 00 ] 00 X dirty uncached (fence: 9)
    05800000  7995392 36 00 [ 4dab4 00 00 00 00 ] 00 X dirty uncached (fence: 5)
    04400000  1474560 02 00 [ 4dab4 00 00 00 00 ] 4dab4 X dirty render uncached (fence: 1)
    07800000  1474560 02 00 [ 4dab5 00 00 00 00 ] 4dab5 X dirty render uncached (fence: 12)
    07400000  1474560 36 00 [ 4dab5 00 00 00 00 ] 4dab4 X dirty render uncached (fence: 14)
    07c00000  1474560 37 00 [ 4dab5 00 00 00 00 ] 00 X dirty uncached (fence: 6)
    04200000  1474560 02 00 [ 4dab5 00 00 00 00 ] 4dab5 X dirty render uncached (fence: 2)
    0b800000    49152 06 00 [ 4dab5 00 00 00 00 ] 4dab5 dirty render uncached
    07600000   376832 76 00 [ 4dab5 00 00 00 00 ] 00 dirty uncached
    01c00000  1048576 36 00 [ 4dab5 00 00 00 00 ] 00 Y dirty uncached
    02600000   344064 76 00 [ 4dab5 00 00 00 00 ] 00 dirty uncached
    07e00000     4096 3f 00 [ 4dab5 00 00 00 00 ] 00 dirty uncached
  Pinned [3]:
    0012c000   131072 40 40 [ 00 00 00 00 00 ] 00 P dirty uncached
    00150000  7057408 76 00 [ 00 00 00 00 00 ] 00 P dirty uncached (name: 1)
    03000000  8650752 02 00 [ 00 00 00 00 00 ] 00 P X dirty uncached (name: 4) (fence: 13)
render ring (submitted by Xorg [1162]) --- gtt_offset = 0x01b00000
00000000 :  54300004
00000004 :  03001000
00000008 :  00000000
0000000c :  01680280
00000010 :  04400000
00000014 :  00000000
00000018 :  6ba008a1

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https://bugs.launchpad.net/bugs/1511045

Title:
  Gpu hang unexpected

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  $ dmesg | grep drm
  [    2.457690] [drm] Initialized drm 1.1.0 20060810
  [    2.799030] [drm] Memory usable by graphics device = 256M
  [    2.799059] fb: switching to inteldrmfb from VESA VGA
  [    2.799497] [drm] Replacing VGA console driver
  [    2.801977] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
  [    2.801987] [drm] Driver supports precise vblank timestamp query.
  [    2.833563] [drm] initialized overlay support
  [    2.833703] [drm] Initialized i915 1.6.0 20150522 for 0000:00:02.0 on minor 0
  [    2.935517] fbcon: inteldrmfb (fb0) is primary device
  [    2.936113] i915 0000:00:02.0: fb0: inteldrmfb frame buffer device
  [ 2762.004076] [drm] stuck on render ring
  [ 2762.009803] [drm] GPU HANG: ecode 3:0:0x7a7fffc1, in Xorg [1162], reason: Ring hung, action: reset
  [ 2762.009816] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
  [ 2762.009821] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
  [ 2762.009827] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
  [ 2762.009832] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
  [ 2762.009837] [drm] GPU crash dump saved to /sys/class/drm/card0/error
  [ 2762.042393] drm/i915: Resetting chip after gpu hang

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic i686
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: i386
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: MATE
  Date: Wed Oct 28 18:11:02 2015
  HibernationDevice: RESUME=/dev/mapper/192--168--0--102--vg-swap_1
  IwConfig:
   lo        no wireless extensions.
   
   eth0      no wireless extensions.
  MachineType: Olidata S.p.A. ALABAMA
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=/dev/mapper/192--168--0--102--vg-root ro splash quiet vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  RfKill:
   
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/08/2008
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: S0101
  dmi.board.asset.tag: To Be Filled By O.E.M.
  dmi.board.name: To be filled by O.E.M.
  dmi.board.vendor: To be filled by O.E.M.
  dmi.board.version: To be filled by O.E.M.
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrS0101:bd07/08/2008:svnOlidataS.p.A.:pnALABAMA:pvrToBeFilledByO.E.M.:rvnTobefilledbyO.E.M.:rnTobefilledbyO.E.M.:rvrTobefilledbyO.E.M.:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: ALABAMA
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: Olidata S.p.A.

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