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[James Hunt <1351353@xxxxxxxxxxxxxxxxxx>]

@Chris - I'm not an expert at reading kernel stack traces, but I don't
think the oops stacktrace looks related to kvm. I just mentioned that I
was using kvm when the oops occurred (*). I've edited the title
accordingly.

(*) - I know this since I have a script which warns me as soon as an
oops is generated.

** Summary changed:

- Kernel oops related to running kvm (?)
+ Kernel oops

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https://bugs.launchpad.net/bugs/1351353

Title:
  Kernel oops

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  My system suddently became unresponsive so I tried to SysRq s/u/b and
  I think that's what caused another problem.

  Either way, my system hard-locked.


  Aug  1 16:15:59 faire kernel: [31778.831601] ------------[ cut here ]------------
  Aug  1 16:15:59 faire kernel: [31778.831644] WARNING: CPU: 2 PID: 1834 at /build/buildd/linux-3.16.0/drivers/gpu/drm/i915/intel_display.c:3313 intel_crtc_wait_for_pending_flips+0x171/0x180 [i915]()
  Aug  1 16:15:59 faire kernel: [31778.831646] Modules linked in: cdc_acm ums_cypress btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c veth ccm overlayfs xt_CHECKSUM iptable_mangle ipt_MASQUERADE iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables deflate ctr twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common camellia_generic camellia_aesni_avx2 camellia_aesni_avx_x86_64 camellia_x86_64 serpent_avx2 serpent_avx_x86_64 serpent_sse2_x86_64 xts serpent_generic blowfish_generic blowfish_x86_64 blowfish_common cast5_avx_x86_64 cast5_generic cast_common des_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo arc4 intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm microcode snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi joydev binfmt_misc serio_raw iwlmvm mac80211 snd_hda_intel snd_hda_controller snd_hda_codec snd_hwdep lpc_ich rtsx_pci_ms iwlwifi memstick snd_pcm cfg80211 uvcvideo videobuf2_vmalloc videobuf2_memops shpchp videobuf2_core v4l2_common mei_me videodev mei media thinkpad_acpi nvram btusb snd_seq_midi snd_seq_midi_event bluetooth snd_rawmidi 6lowpan_iphc snd_seq snd_seq_device snd_timer snd intel_smartconnect soundcore cuse parport_pc mac_hid ppdev lp parport nls_iso8859_1 uas usb_storage hid_generic usbhid hid dm_crypt mmc_block rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i915 ahci e1000e libahci rtsx_pci ptp pps_core i2c_algo_bit drm_kms_helper wmi drm video
  Aug  1 16:15:59 faire kernel: [31778.831718] CPU: 2 PID: 1834 Comm: Xorg Not tainted 3.16.0-6-generic #11-Ubuntu
  Aug  1 16:15:59 faire kernel: [31778.831720] Hardware name: LENOVO 20AQCTO1WW/20AQCTO1WW, BIOS GJET71WW (2.21 ) 02/10/2014
  Aug  1 16:15:59 faire kernel: [31778.831721]  0000000000000009 ffff8800d6233c10 ffffffff82755538 0000000000000000
  Aug  1 16:15:59 faire kernel: [31778.831724]  ffff8800d6233c48 ffffffff8206bb0d 0000000000000000 ffff880308eed000
  Aug  1 16:15:59 faire kernel: [31778.831726]  ffff880304108240 ffff8800da1e1000 ffff8800da1e1000 ffff8800d6233c58
  Aug  1 16:15:59 faire kernel: [31778.831729] Call Trace:
  Aug  1 16:15:59 faire kernel: [31778.831735]  [<ffffffff82755538>] dump_stack+0x45/0x56
  Aug  1 16:15:59 faire kernel: [31778.831739]  [<ffffffff8206bb0d>] warn_slowpath_common+0x7d/0xa0
  Aug  1 16:15:59 faire kernel: [31778.831742]  [<ffffffff8206bbea>] warn_slowpath_null+0x1a/0x20
  Aug  1 16:15:59 faire kernel: [31778.831765]  [<ffffffffc04c6951>] intel_crtc_wait_for_pending_flips+0x171/0x180 [i915]
  Aug  1 16:15:59 faire kernel: [31778.831769]  [<ffffffff820b2960>] ? prepare_to_wait_event+0x100/0x100
  Aug  1 16:15:59 faire kernel: [31778.831787]  [<ffffffffc04c9403>] intel_crtc_disable_planes+0x33/0x1c0 [i915]
  Aug  1 16:15:59 faire kernel: [31778.831790]  [<ffffffff8275bb2b>] ? __ww_mutex_lock+0x1b/0x97
  Aug  1 16:15:59 faire kernel: [31778.831807]  [<ffffffffc04ca305>] haswell_crtc_disable+0x55/0x2f0 [i915]
  Aug  1 16:15:59 faire kernel: [31778.831809]  [<ffffffff8275c062>] ? mutex_lock+0x12/0x2f
  Aug  1 16:15:59 faire kernel: [31778.831823]  [<ffffffffc04cad27>] intel_crtc_update_dpms+0x67/0xa0 [i915]
  Aug  1 16:15:59 faire kernel: [31778.831835]  [<ffffffffc04cf1e9>] intel_connector_dpms+0x59/0x70 [i915]
  Aug  1 16:15:59 faire kernel: [31778.831848]  [<ffffffffc039ea1f>] drm_mode_obj_set_property_ioctl+0x39f/0x3b0 [drm]
  Aug  1 16:15:59 faire kernel: [31778.831858]  [<ffffffffc039ea60>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
  Aug  1 16:15:59 faire kernel: [31778.831860]  [<ffffffffc0c0c0c0>] ? ipv4_conntrack_defrag+0xb0/0x163 [nf_defrag_ipv4]
  Aug  1 16:15:59 faire kernel: [31778.831868]  [<ffffffffc038da3c>] drm_ioctl+0x1ec/0x660 [drm]
  Aug  1 16:15:59 faire kernel: [31778.831873]  [<ffffffff821e2d20>] do_vfs_ioctl+0x2e0/0x4c0
  Aug  1 16:15:59 faire kernel: [31778.831876]  [<ffffffff820a2de4>] ? vtime_account_user+0x54/0x60
  Aug  1 16:15:59 faire kernel: [31778.831878]  [<ffffffff821e2f81>] SyS_ioctl+0x81/0xa0
  Aug  1 16:15:59 faire kernel: [31778.831880]  [<ffffffff8275de7f>] tracesys+0xe1/0xe6
  Aug  1 16:15:59 faire kernel: [31778.831881] ---[ end trace bb931f1719ba6be2 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-generic 3.16.0.6.7
  ProcVersionSignature: Ubuntu 3.16.0-6.11-generic 3.16.0-rc7
  Uname: Linux 3.16.0-6-generic x86_64
  ApportVersion: 2.14.5-0ubuntu2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   james      3646 F...m pulseaudio
   /dev/snd/controlC1:  james      3646 F.... pulseaudio
   /dev/snd/controlC0:  james      3646 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Aug  1 16:20:46 2014
  HibernationDevice: RESUME=UUID=db600bbe-faca-41f4-9338-c3e8e227599a
  InstallationDate: Installed on 2014-04-11 (111 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Daily amd64 (20140409)
  MachineType: LENOVO 20AQCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-6-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-6-generic N/A
   linux-backports-modules-3.16.0-6-generic  N/A
   linux-firmware                            1.132
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2014-05-08 (85 days ago)
  dmi.bios.date: 02/10/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET71WW (2.21 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET71WW(2.21):bd02/10/2014:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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