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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Yuan Song, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1535521

** Package changed: linux-lts-vivid (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

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https://bugs.launchpad.net/bugs/1535521

Title:
  kernel stack trace

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When I booted into 3.19.0.43 from Ubuntu 14.04.3 .   The kernel
  stopped during boot.  I checked dmesg. There was a stack trace.  The
  motherboard I used is a ASRock H170M Pro4  Bios p1.8.  The following
  is the stack trace.

   [    8.484935] [drm] Replacing VGA console driver
  [    8.489503] Console: switching to colour dummy device 80x25
  [    8.492850] usbcore: registered new interface driver btusb
  [    8.503446] audit: type=1400 audit(1453175142.377:2): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/lib/cups/backend/cups-pdf" pid=600 comm="apparmor_parser"
  [    8.503654] audit: type=1400 audit(1453175142.377:3): apparmor="STATUS" operation="profile_load" profile="unconfined" name="/usr/sbin/cupsd" pid=600 comm="apparmor_parser"
  [    8.504798] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
  [    8.504800] [drm] Driver supports precise vblank timestamp query.
  [    8.506398] BUG: unable to handle kernel NULL pointer dereference at 0000000000000060
  [    8.506403] IP: [<ffffffffc0702e45>] ddi_get_encoder_port+0x5/0x70 [i915_bpo]
  [    8.506428] PGD 274ff3067 PUD 274494067 PMD 0
  [    8.506430] Oops: 0000 [#1] SMP
  [    8.506432] Modules linked in: snd_seq(+) snd_seq_device snd_timer snd btusb soundcore i915_bpo(+) intel_ips drm_kms_helper drm i2c_algo_bit shpchp 8250_fintek wmi video i2c_hid mac_hid acpi_pad parport_pc ppdev coretemp hwmon_vid rfcomm lp parport bnep bluetooth nfsd auth_rpcgss nfs_acl nfs binfmt_misc lockd grace sunrpc fscache hid_generic hid_logitech_dj usbhid hid raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor megaraid_sas psmouse e1000e ptp ahci pps_core libahci raid6_pq raid1 raid0 multipath linear dm_mirror dm_region_hash dm_log
  [    8.506457] CPU: 0 PID: 634 Comm: systemd-udevd Not tainted 3.19.0-43-generic #49~14.04.1-Ubuntu
  [    8.506459] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./H170M Pro4, BIOS P1.80 11/10/2015
  [    8.506461] task: ffff880275f6f5c0 ti: ffff8802751c8000 task.ti: ffff8802751c8000
  [    8.506463] RIP: 0010:[<ffffffffc0702e45>]  [<ffffffffc0702e45>] ddi_get_encoder_port+0x5/0x70 [i915_bpo]
  [    8.506482] RSP: 0018:ffff8802751cb750  EFLAGS: 00010286
  [    8.506483] RAX: 0000000000000000 RBX: ffff880071800000 RCX: ffff8802755c1800
  [    8.506484] RDX: ffff8802751cb7a4 RSI: ffff8802751cb7b0 RDI: fffffffffffffff8
  [    8.506485] RBP: ffff8802751cb7e8 R08: ffff8802751c8000 R09: 0000000000000246
  [    8.506487] R10: 0000000000000004 R11: 0000000000000005 R12: ffff8802755c1800
  [    8.506488] R13: ffffffffc0760770 R14: 00000000fffee35b R15: 0000000000000001
  [    8.506489] FS:  00007f4aa208d880(0000) GS:ffff880280c00000(0000) knlGS:0000000000000000
  [    8.506491] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [    8.506492] CR2: 0000000000000060 CR3: 0000000274ff2000 CR4: 00000000003407f0
  [    8.506493] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  [    8.506494] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  [    8.506495] Stack:
  [    8.506496]  ffffffffc0706fe1 ffff880280d8e4c0 0000000000000000 000000000000027a
  [    8.506499]  ffffffff817b677c 0000000000000246 ffff8802755c1b60 ffff8802755c1800
  [    8.506501]  fffffffffffffff8 0000000000000000 ffff880071800000 0000000000000000
  [    8.506503] Call Trace:
  [    8.506522]  [<ffffffffc0706fe1>] ? intel_prepare_ddi+0x71/0x390 [i915_bpo]
  [    8.506527]  [<ffffffff817b677c>] ? schedule_hrtimeout_range_clock+0xac/0x160
  [    8.506541]  [<ffffffffc0687071>] skl_set_power_well+0x421/0xae0 [i915_bpo]
  [    8.506555]  [<ffffffffc0687763>] skl_power_well_enable+0x13/0x20 [i915_bpo]
  [    8.506568]  [<ffffffffc0687a26>] intel_display_power_get+0xa6/0x100 [i915_bpo]
  [    8.506578]  [<ffffffffc0687d15>] intel_display_set_init_power+0x45/0x50 [i915_bpo]
  [    8.506587]  [<ffffffffc0687fa4>] intel_power_domains_init_hw+0x204/0x340 [i915_bpo]
  [    8.506606]  [<ffffffffc07275f4>] i915_driver_load+0x7d4/0xeb0 [i915_bpo]
  [    8.506608]  [<ffffffff813a97a0>] ? cleanup_uevent_env+0x10/0x10
  [    8.506610]  [<ffffffff813a9b58>] ? kobject_uevent_env+0x178/0x690
  [    8.506614]  [<ffffffff814fc000>] ? devtmpfs_create_node+0x100/0x130
  [    8.506616]  [<ffffffff814f0d77>] ? get_device+0x17/0x30
  [    8.506618]  [<ffffffff814f67b5>] ? klist_class_dev_get+0x15/0x20
  [    8.506620]  [<ffffffff8179fbe8>] ? klist_node_init+0x38/0x50
  [    8.506622]  [<ffffffff8179fc96>] ? klist_add_tail+0x46/0x50
  [    8.506624]  [<ffffffff814f2709>] ? device_add+0x289/0x650
  [    8.506632]  [<ffffffffc05d2685>] drm_dev_register+0xb5/0x110 [drm]
  [    8.506638]  [<ffffffffc05d55ff>] drm_get_pci_dev+0x8f/0x200 [drm]
  [    8.506649]  [<ffffffffc067523b>] i915_pci_probe+0x3b/0x60 [i915_bpo]
  [    8.506653]  [<ffffffff813f20b5>] local_pci_probe+0x45/0xa0
  [    8.506655]  [<ffffffff813f3355>] ? pci_match_device+0xe5/0x110
  [    8.506657]  [<ffffffff813f3499>] pci_device_probe+0xd9/0x130
  [    8.506660]  [<ffffffff814f5935>] driver_probe_device+0x155/0x400
  [    8.506662]  [<ffffffff814f5cbb>] __driver_attach+0x9b/0xa0
  [    8.506664]  [<ffffffff814f5c20>] ? __device_attach+0x40/0x40
  [    8.506666]  [<ffffffff814f37f3>] bus_for_each_dev+0x63/0xa0
  [    8.506669]  [<ffffffff814f52ce>] driver_attach+0x1e/0x20
  [    8.506671]  [<ffffffff814f4ec0>] bus_add_driver+0x180/0x240
  [    8.506673]  [<ffffffff814f64a4>] driver_register+0x64/0xf0
  [    8.506675]  [<ffffffff813f19fc>] __pci_register_driver+0x4c/0x50
  [    8.506682]  [<ffffffffc05d586a>] drm_pci_init+0xfa/0x130 [drm]
  [    8.506684]  [<ffffffffc078c000>] ? 0xffffffffc078c000
  [    8.506695]  [<ffffffffc078c0a0>] i915_init+0xa0/0xa8 [i915_bpo]
  [    8.506698]  [<ffffffff81002144>] do_one_initcall+0xd4/0x210
  [    8.506701]  [<ffffffff811cf4e9>] ? kmem_cache_alloc_trace+0x199/0x220
  [    8.506704]  [<ffffffff810f7e1c>] ? load_module+0x164c/0x1cc0
  [    8.506706]  [<ffffffff810f7e55>] load_module+0x1685/0x1cc0
  [    8.506708]  [<ffffffff810f3700>] ? store_uevent+0x40/0x40
  [    8.506710]  [<ffffffff810f8606>] SyS_finit_module+0x86/0xb0
  [    8.506713]  [<ffffffff817b770d>] system_call_fastpath+0x16/0x1b
  [    8.506714] Code: ff 93 c8 00 00 00 4c 89 e6 48 89 df 31 d2 ff 93 a8 00 00 00 5b 41 5c 5d c3 66 66 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <8b> 47 68 83 f8 0b 74 33 83 f8 0a 74 1e 8d 48 fa 83 f9 02 76 16
  [    8.506732] RIP  [<ffffffffc0702e45>] ddi_get_encoder_port+0x5/0x70 [i915_bpo]
  [    8.506749]  RSP <ffff8802751cb750>
  [    8.506750] CR2: 0000000000000060
  [    8.506751] ---[ end trace bbc1959b1af7bdf6 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.19.0-43-generic 3.19.0-43.49~14.04.1
  ProcVersionSignature: Ubuntu 3.13.0-74.118-generic 3.13.11-ckt30
  Uname: Linux 3.13.0-74-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Mon Jan 18 22:23:42 2016
  InstallationDate: Installed on 2013-04-02 (1022 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  SourcePackage: linux-lts-vivid
  UpgradeStatus: Upgraded to trusty on 2014-04-19 (639 days ago)

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