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[Bug 1511011] Status changed to Confirmed


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** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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  This errors repeats frequently since upgrading to 15.10

Status in linux package in Ubuntu:

Bug description:
  I use the machine to host a Windows VM with libvirt and qemu/KVM and it freezes completely more than twice a day, no log, no ssh, no terminal. Only this error appears on the log when doing nothing, I just leave it idle to see what happened.
  Same machines, config and Windows guest running on 14.04 are having no problems, but 15.04 and 15.10 are very unstable, I'm downgrading.

  ------------[ cut here ]------------
  WARNING: CPU: 0 PID: 1091 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:429 vlv_clock+0x73/0xa0 [i915]()
  WARN_ON(clock->n == 0 || clock->p == 0)
  Modules linked in: ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables nls_iso8859_1 ppdev snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_code
   drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt hid_generic usbhid i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd i2c_algo_bit psmouse drm_kms_helper
  CPU: 0 PID: 1091 Comm: kworker/0:0 Tainted: G        W       4.2.0-16-generic #19-Ubuntu
  Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./Q1900B-ITX, BIOS P1.70 11/04/2014
  Workqueue: events console_callback
   0000000000000000 000000003e966b39 ffff880035a274b8 ffffffff817e8c09
   0000000000000000 ffff880035a27510 ffff880035a274f8 ffffffff8107b3c6
   ffff880035a274d8 ffff880035a27650 0000000000000000 ffff880035a87bc8
  Call Trace:
   [<ffffffff817e8c09>] dump_stack+0x45/0x57
   [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
   [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
   [<ffffffffc01f2b93>] vlv_clock+0x73/0xa0 [i915]
   [<ffffffffc01fb5b9>] i9xx_get_pipe_config+0x2e9/0x680 [i915]
   [<ffffffffc01f7e42>] check_crtc_state+0x152/0x440 [i915]
   [<ffffffffc020bd6d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
   [<ffffffffc020cf27>] intel_crtc_set_config+0x4c7/0x580 [i915]
   [<ffffffffc00a14c6>] drm_mode_set_config_internal+0x66/0x100 [drm]
   [<ffffffffc0112245>] drm_fb_helper_pan_display+0x95/0xe0 [drm_kms_helper]
   [<ffffffff81442b0d>] ? soft_cursor+0x1ad/0x230
   [<ffffffffc021a2fa>] intel_fbdev_pan_display+0x1a/0x60 [i915]
   [<ffffffff81447a6f>] fb_pan_display+0xcf/0x160
   [<ffffffff81441ba0>] bit_update_start+0x20/0x50
   [<ffffffff8143ec93>] fbcon_switch+0x3b3/0x650
   [<ffffffff814d253c>] redraw_screen+0x1ac/0x2a0
   [<ffffffff8143dfb0>] fbcon_blank+0x120/0x360
   [<ffffffff810ae699>] ? update_curr+0x119/0x150
   [<ffffffff810e5318>] ? lock_timer_base.isra.22+0x58/0x80
   [<ffffffff810e5531>] ? internal_add_timer+0x71/0x80
   [<ffffffff810e6f23>] ? mod_timer+0x143/0x220
   [<ffffffff814d39f3>] do_unblank_screen+0xd3/0x1a0
   [<ffffffff814d4a3c>] poke_blanked_console+0xbc/0xc0
   [<ffffffff814d4b94>] console_callback+0x154/0x180
   [<ffffffff8109412a>] process_one_work+0x1aa/0x440
   [<ffffffff8109440b>] worker_thread+0x4b/0x4c0
   [<ffffffff810943c0>] ? process_one_work+0x440/0x440
   [<ffffffff810943c0>] ? process_one_work+0x440/0x440
   [<ffffffff8109a7c8>] kthread+0xd8/0xf0
   [<ffffffff8109a6f0>] ? kthread_create_on_node+0x1f0/0x1f0
   [<ffffffff817efe1f>] ret_from_fork+0x3f/0x70
   [<ffffffff8109a6f0>] ? kthread_create_on_node+0x1f0/0x1f0
  ---[ end trace 28c7cfb15c613738 ]---
  [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in base.adjusted_mode.crtc_clock (expected 56250, found 0)
  ------------[ cut here ]------------

  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 x86_64
  AlsaVersion: Advanced Linux Sound Architecture Driver Version k4.2.0-16-generic.
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/hwC0D2', '/dev/snd/hwC0D0', '/dev/snd/pcmC0D3p', '/dev/snd/pcmC0D2c', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/controlC0', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  Card0.Amixer.info: Error: [Errno 2] No such file or directory: 'amixer'
  Card0.Amixer.values: Error: [Errno 2] No such file or directory: 'amixer'
  Date: Wed Oct 28 15:53:51 2015
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2015-07-08 (111 days ago)
  InstallationMedia: Ubuntu-Server 15.04 "Vivid Vervet" - Release amd64 (20150422)
   p1p1      no wireless extensions.
   lo        no wireless extensions.
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 04f3:0103 Elan Microelectronics Corp. ActiveJet K-2024 Multimedia Keyboard
   Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. Hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/vmlinuz-4.2.0-16-generic.efi.signed root=UUID=fb39de06-cf03-43a0-a736-ac681cf65dcb ro rootflags=subvol=@
   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: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-10-27 (1 days ago)
  dmi.bios.date: 11/04/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P1.70
  dmi.board.name: Q1900B-ITX
  dmi.board.vendor: ASRock
  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.:bvrP1.70:bd11/04/2014:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnQ1900B-ITX:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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