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[Pirouette Cacahuète <1449401@xxxxxxxxxxxxxxxxxx>]

$ git bisect good 
d960a0bdfb6406d65c29cad4689d03c895fa5fcd is the first bad commit
commit d960a0bdfb6406d65c29cad4689d03c895fa5fcd
Author: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
Date:   Thu Mar 26 14:49:27 2015 +0200

    drm/i915/bdw: Apply workarounds in render ring init function
    
    BugLink: http://bugs.launchpad.net/bugs/1374389
    
    For BDW workarounds are currently initialized in init_clock_gating() but
    they are lost during reset, suspend/resume etc; this patch moves the WAs
    that are part of register state context to render ring init fn otherwise
    default context ends up with incorrect values as they don't get initialized
    until init_clock_gating fn.
    
    v2: Add workarounds to golden render state
    This method has its own issues, first of all this is different for
    each gen and it is generated using a tool so adding new workaround
    and mainitaining them across gens is not a straightforward process.
    
    v3: Use LRIs to emit these workarounds (Ville)
    Instead of modifying the golden render state the same LRIs are
    emitted from within the driver.
    
    v4: Use abstract name when exporting gen specific routines (Chris)
    
    For: VIZ-4092
    Signed-off-by: Arun Siluvery <arun.siluvery@xxxxxxxxxxxxxxx>
    Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
    Signed-off-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
    (backported from commit 86d7f23842f1bce3ab5e8c8d0c676112bbc4c99b)
    Signed-off-by: Timo Aaltonen <timo.aaltonen@xxxxxxxxxxxxx>
    
    Conflicts:
    	drivers/gpu/drm/i915/intel_ringbuffer.c
    Signed-off-by: Brad Figg <brad.figg@xxxxxxxxxxxxx>

:040000 040000 dadeaa890a6bee2e5d2fbd3cc0490ca0019d334d
34647b04b44f8b912d13e41c990b2eface864642 M      drivers

** Tags removed: needs-bisect

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https://bugs.launchpad.net/bugs/1449401

Title:
  After 14.10 updates to kernel 3.16.0-36, system is not booting,
  resulting in black screen due to NULL pointer in intel_ring_init_seqno

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Utopic:
  New

Bug description:
  This happens everytime I boot after updating kernel from 3.16.0-34 to
  3.16.0-36. Keeping 3.16.0-34 still works.

  Blackscreen is illuminated. I do not see any splash screen, nor X.
  Failsafe mode works, booting with "nomodeset" works (but it's slow).
  When this happens, on the next reboot I do see some "BUG:" lines in
  syslog, like:

  Apr 27 21:01:54 portable-alex kernel: [    2.457904] BUG: unable to handle kernel NULL pointer dereference at           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457911] IP: [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457913] PGD 51b93d067 PUD 51b8ec067 PMD 0 
  Apr 27 21:01:54 portable-alex kernel: [    2.457916] Oops: 0010 [#1] SMP 
  Apr 27 21:01:54 portable-alex kernel: [    2.457918] Modules linked in: rtsx_pci_sdmmc i915(+) e1000e ahci ptp i2c_algo_bit drm_kms_helper libahci pps_core psmouse drm rtsx_pci wmi video
  Apr 27 21:01:54 portable-alex kernel: [    2.457926] CPU: 0 PID: 128 Comm: systemd-udevd Not tainted 3.16.0-36-generic #48-Ubuntu
  Apr 27 21:01:54 portable-alex kernel: [    2.457929] Hardware name: LENOVO 20BXCTO1WW/20BXCTO1WW, BIOS JBET45WW (1.10 ) 02/03/2015
  Apr 27 21:01:54 portable-alex kernel: [    2.457930] task: ffff88051be6bd20 ti: ffff88051b9a8000 task.ti: ffff88051b9a8000
  Apr 27 21:01:54 portable-alex kernel: [    2.457932] RIP: 0010:[<0000000000000000>]  [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.457934] RSP: 0018:ffff88051b9ab890  EFLAGS: 00010286
  Apr 27 21:01:54 portable-alex kernel: [    2.457936] RAX: 0000000000000246 RBX: ffff88051bbb1928 RCX: 0000000000000001
  Apr 27 21:01:54 portable-alex kernel: [    2.457937] RDX: 0000000000000001 RSI: 00000000ffffeffe RDI: ffff88051bbb1928
  Apr 27 21:01:54 portable-alex kernel: [    2.457938] RBP: ffff88051b9ab8b0 R08: ffff88051bbb0000 R09: 0000000000000246
  Apr 27 21:01:54 portable-alex kernel: [    2.457940] R10: ffff880529403900 R11: ffffffff811a6ddf R12: 00000000ffffeffe
  Apr 27 21:01:54 portable-alex kernel: [    2.457941] R13: ffff88051bbb0000 R14: 00000000ffffeffe R15: ffff88051bf90800
  Apr 27 21:01:54 portable-alex kernel: [    2.457942] FS:  00007f8127b4f880(0000) GS:ffff88053dc00000(0000) knlGS:0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.457944] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Apr 27 21:01:54 portable-alex kernel: [    2.457945] CR2: 0000000000000000 CR3: 000000051b942000 CR4: 00000000003407f0
  Apr 27 21:01:54 portable-alex kernel: [    2.457947] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.457948] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Apr 27 21:01:54 portable-alex kernel: [    2.457949] Stack:
  Apr 27 21:01:54 portable-alex kernel: [    2.457950]  ffffffffc02499fd ffff88051bbb1928 ffff88051bbb7148 ffff88051bbb7148
  Apr 27 21:01:54 portable-alex kernel: [    2.457953]  ffff88051b9ab8e8 ffffffffc022e5b7 00000000ffffefff 00000000ffffeffe
  Apr 27 21:01:54 portable-alex kernel: [    2.457955]  ffff88051bbb0000 ffff88051bbb0000 ffff88051bbb0000 ffff88051b9ab910
  Apr 27 21:01:54 portable-alex kernel: [    2.457957] Call Trace:
  Apr 27 21:01:54 portable-alex kernel: [    2.457977]  [<ffffffffc02499fd>] ? intel_ring_init_seqno+0x3d/0xb0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.457991]  [<ffffffffc022e5b7>] i915_gem_init_seqno+0x77/0xc0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458002]  [<ffffffffc022e629>] i915_gem_set_seqno+0x29/0x60 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458013]  [<ffffffffc022fdcd>] i915_gem_init_hw+0x12d/0x380 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458022]  [<ffffffffc0230075>] i915_gem_init+0x55/0x1d0 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458039]  [<ffffffffc02956a2>] i915_driver_load+0xe32/0x1030 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458042]  [<ffffffff813a05e8>] ? kobject_uevent_env+0x178/0x690
  Apr 27 21:01:54 portable-alex kernel: [    2.458046]  [<ffffffff814cf087>] ? get_device+0x17/0x30
  Apr 27 21:01:54 portable-alex kernel: [    2.458048]  [<ffffffff814d4af5>] ? klist_class_dev_get+0x15/0x20
  Apr 27 21:01:54 portable-alex kernel: [    2.458051]  [<ffffffff817773b8>] ? klist_node_init+0x38/0x60
  Apr 27 21:01:54 portable-alex kernel: [    2.458054]  [<ffffffff81777476>] ? klist_add_tail+0x46/0x50
  Apr 27 21:01:54 portable-alex kernel: [    2.458056]  [<ffffffff814d089b>] ? device_add+0x1db/0x6d0
  Apr 27 21:01:54 portable-alex kernel: [    2.458066]  [<ffffffffc012f4f6>] ? drm_sysfs_device_add+0xd6/0x120 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458072]  [<ffffffffc012b9dd>] drm_dev_register+0xad/0x100 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458078]  [<ffffffffc012e5cd>] drm_get_pci_dev+0x8d/0x200 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458088]  [<ffffffffc020b4bb>] i915_pci_probe+0x3b/0x60 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458091]  [<ffffffff813e6d15>] local_pci_probe+0x45/0xa0
  Apr 27 21:01:54 portable-alex kernel: [    2.458093]  [<ffffffff813e7ff5>] ? pci_match_device+0xe5/0x110
  Apr 27 21:01:54 portable-alex kernel: [    2.458096]  [<ffffffff813e8139>] pci_device_probe+0xd9/0x130
  Apr 27 21:01:54 portable-alex kernel: [    2.458098]  [<ffffffff814d3bd3>] driver_probe_device+0xa3/0x410
  Apr 27 21:01:54 portable-alex kernel: [    2.458100]  [<ffffffff814d400b>] __driver_attach+0x8b/0x90
  Apr 27 21:01:54 portable-alex kernel: [    2.458101]  [<ffffffff814d3f80>] ? __device_attach+0x40/0x40
  Apr 27 21:01:54 portable-alex kernel: [    2.458104]  [<ffffffff814d1a4b>] bus_for_each_dev+0x6b/0xb0
  Apr 27 21:01:54 portable-alex kernel: [    2.458106]  [<ffffffff814d365e>] driver_attach+0x1e/0x20
  Apr 27 21:01:54 portable-alex kernel: [    2.458107]  [<ffffffff814d3260>] bus_add_driver+0x180/0x250
  Apr 27 21:01:54 portable-alex kernel: [    2.458109]  [<ffffffff814d47e4>] driver_register+0x64/0xf0
  Apr 27 21:01:54 portable-alex kernel: [    2.458112]  [<ffffffff813e658c>] __pci_register_driver+0x4c/0x50
  Apr 27 21:01:54 portable-alex kernel: [    2.458117]  [<ffffffffc012e84a>] drm_pci_init+0x10a/0x140 [drm]
  Apr 27 21:01:54 portable-alex kernel: [    2.458119]  [<ffffffffc02ed000>] ? 0xffffffffc02ecfff
  Apr 27 21:01:54 portable-alex kernel: [    2.458129]  [<ffffffffc02ed089>] i915_init+0x89/0x90 [i915]
  Apr 27 21:01:54 portable-alex kernel: [    2.458132]  [<ffffffff81002148>] do_one_initcall+0xd8/0x210
  Apr 27 21:01:54 portable-alex kernel: [    2.458135]  [<ffffffff811a8902>] ? __vunmap+0xa2/0x100
  Apr 27 21:01:54 portable-alex kernel: [    2.458138]  [<ffffffff810f39f8>] load_module+0x14b8/0x1b60
  Apr 27 21:01:54 portable-alex kernel: [    2.458140]  [<ffffffff810ef370>] ? store_uevent+0x40/0x40
  Apr 27 21:01:54 portable-alex kernel: [    2.458143]  [<ffffffff811e77b8>] ? kernel_read+0x48/0x60
  Apr 27 21:01:54 portable-alex kernel: [    2.458145]  [<ffffffff810f4216>] SyS_finit_module+0x86/0xb0
  Apr 27 21:01:54 portable-alex kernel: [    2.458149]  [<ffffffff8178c98d>] system_call_fastpath+0x1a/0x1f
  Apr 27 21:01:54 portable-alex kernel: [    2.458150] Code:  Bad RIP value.
  Apr 27 21:01:54 portable-alex kernel: [    2.458153] RIP  [<          (null)>]           (null)
  Apr 27 21:01:54 portable-alex kernel: [    2.458154]  RSP <ffff88051b9ab890>
  Apr 27 21:01:54 portable-alex kernel: [    2.458155] CR2: 0000000000000000
  Apr 27 21:01:54 portable-alex kernel: [    2.458157] ---[ end trace e531fde427227413 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.10
  Package: linux-image-3.16.0-36-generic 3.16.0-36.48
  ProcVersionSignature: Ubuntu 3.16.0-34.47-generic 3.16.7-ckt8
  Uname: Linux 3.16.0-34-generic x86_64
  ApportVersion: 2.14.7-0ubuntu8.4
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  alex       3165 F.... pulseaudio
   /dev/snd/controlC0:  alex       3165 F.... pulseaudio
  Date: Tue Apr 28 09:20:10 2015
  HibernationDevice: RESUME=UUID=3013558c-f831-45dd-8df1-9446a8f310c5
  InstallationDate: Installed on 2012-11-03 (905 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 20BXCTO1WW
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.16.0-34-generic root=UUID=fb606209-63f0-4ff0-a524-a7cba117cdc3 ro quiet splash nomdmonddf nomdmonisw
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-34-generic N/A
   linux-backports-modules-3.16.0-34-generic  N/A
   linux-firmware                             1.138.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to utopic on 2015-03-07 (51 days ago)
  dmi.bios.date: 02/03/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET45WW (1.10 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BXCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: SDK0E50510 WIN
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: None
  dmi.modalias: dmi:bvnLENOVO:bvrJBET45WW(1.10):bd02/03/2015:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BXCTO1WW
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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