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[Bug 1520090] [NEW] unable to handle kernel NULL pointer dereference; IP: [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]

To: kernel-packages@xxxxxxxxxxxxxxxxxxx
From: gorilych <1520090@xxxxxxxxxxxxxxxxxx>
Date: Thu, 26 Nov 2015 07:04:24 -0000
Reply-to: Bug 1520090 <1520090@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

System crashed second day in a row and only poweroff is possible.

Ubuntu 15.10

from syslog:

Nov 26 11:46:47 hofvarpnir kernel: [13250.527059] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.527473] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.528514] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.529439] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.529853] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.530895] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.531821] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.532140] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.532310] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:47 hofvarpnir kernel: [13250.532479] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
Nov 26 11:46:48 hofvarpnir kernel: [13251.485121] ------------[ cut here ]------------
Nov 26 11:46:48 hofvarpnir kernel: [13251.485146] WARNING: CPU: 3 PID: 5314 at /build/linux-d3RvQM/linux-4.2.0/drivers/gpu/drm/i915/i915_gem_gtt.c:523 gen8_ppgtt_clear_range+0x1ee/0x230 [i915]()
Nov 26 11:46:48 hofvarpnir kernel: [13251.485147] WARN_ON(!pd->page_table[pde])
Nov 26 11:46:48 hofvarpnir kernel: [13251.485148] Modules linked in: vhost_net vhost macvtap macvlan usb_serial_simple usbserial rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc bnep arc4 intel_rapl iosf_mbi iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp input_leds serio_raw mac80211 joydev cdc_mbim cdc_wdm cdc_ncm snd_usb_audio lpc_ich snd_usbmidi_lib cdc_acm snd_seq_midi snd_seq_midi_event usbnet rtsx_pci_ms snd_rawmidi iwlwifi mii uvcvideo videobuf2_vmalloc videobuf2_memops snd_seq thinkpad_acpi cfg80211 memstick videobuf2_core nvram v4l2_common snd_hda_codec_realtek videodev snd_seq_device snd_hda_codec_generic media snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep shpchp mei_me mei snd_pcm snd_timer snd soundcore mac_hid kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs drbg ansi_cprng algif_skcipher af_alg dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i2c_algo_bit ahci drm_kms_helper libahci e1000e rtsx_pci drm ptp pps_core wmi video
Nov 26 11:46:48 hofvarpnir kernel: [13251.485218] CPU: 3 PID: 5314 Comm: kscreenlocker_g Tainted: G        W       4.2.0-17-generic #21-Ubuntu
Nov 26 11:46:48 hofvarpnir kernel: [13251.485219] Hardware name: LENOVO 20BX002KRT/20BX002KRT, BIOS JBET51WW (1.16 ) 07/08/2015
Nov 26 11:46:48 hofvarpnir kernel: [13251.485220]  0000000000000000 00000000af8b4627 ffff88024eebf2c8 ffffffff817e8c09
Nov 26 11:46:48 hofvarpnir kernel: [13251.485223]  0000000000000000 ffff88024eebf320 ffff88024eebf308 ffffffff8107b3c6
Nov 26 11:46:48 hofvarpnir kernel: [13251.485224]  ffffea000662af80 00000000359e5083 000000000000002b ffff8801b72dc000
Nov 26 11:46:48 hofvarpnir kernel: [13251.485226] Call Trace:
Nov 26 11:46:48 hofvarpnir kernel: [13251.485231]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
Nov 26 11:46:48 hofvarpnir kernel: [13251.485234]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
Nov 26 11:46:48 hofvarpnir kernel: [13251.485236]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
Nov 26 11:46:48 hofvarpnir kernel: [13251.485251]  [<ffffffffc01f13c9>] ? i915_gem_object_put_pages_gtt+0x129/0x1d0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485261]  [<ffffffffc01ea1ae>] gen8_ppgtt_clear_range+0x1ee/0x230 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485269]  [<ffffffffc01e798a>] ppgtt_unbind_vma+0x2a/0x30 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485278]  [<ffffffffc01f3bac>] i915_vma_unbind+0xac/0x220 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485287]  [<ffffffffc01f6c12>] i915_gem_shrink+0x172/0x270 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485296]  [<ffffffffc01f6dbb>] i915_gem_shrinker_scan+0xab/0xc0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485300]  [<ffffffff81194e2e>] shrink_slab+0x20e/0x3b0
Nov 26 11:46:48 hofvarpnir kernel: [13251.485304]  [<ffffffff81199649>] shrink_zone+0x2b9/0x2d0
Nov 26 11:46:48 hofvarpnir kernel: [13251.485309]  [<ffffffff811997cd>] do_try_to_free_pages+0x16d/0x400
Nov 26 11:46:48 hofvarpnir kernel: [13251.485312]  [<ffffffff81199b6a>] try_to_free_pages+0x10a/0x150
Nov 26 11:46:48 hofvarpnir kernel: [13251.485316]  [<ffffffff8118b96b>] __alloc_pages_nodemask+0x5eb/0xa10
Nov 26 11:46:48 hofvarpnir kernel: [13251.485320]  [<ffffffff811d2ff1>] alloc_pages_current+0x91/0x100
Nov 26 11:46:48 hofvarpnir kernel: [13251.485334]  [<ffffffffc01e97c7>] alloc_pt_single+0x77/0xe0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485346]  [<ffffffffc01ea677>] gen8_alloc_va_range+0x317/0x8e0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485349]  [<ffffffff810ac33c>] ? __enqueue_entity+0x6c/0x70
Nov 26 11:46:48 hofvarpnir kernel: [13251.485362]  [<ffffffffc01ecc38>] i915_vma_bind+0x118/0x190 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485377]  [<ffffffffc01f4586>] i915_gem_object_do_pin+0x706/0xac0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485380]  [<ffffffff811de4ba>] ? kmem_cache_alloc+0x1ca/0x200
Nov 26 11:46:48 hofvarpnir kernel: [13251.485395]  [<ffffffffc01f497a>] i915_gem_object_pin+0x3a/0x40 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485407]  [<ffffffffc01e4dca>] i915_gem_execbuffer_reserve_vma.isra.21+0x7a/0x140 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485418]  [<ffffffffc01e516f>] i915_gem_execbuffer_reserve+0x2df/0x320 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485429]  [<ffffffffc01e5bc2>] i915_gem_do_execbuffer.isra.27+0x5d2/0x10a0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485432]  [<ffffffff813da56a>] ? find_next_zero_bit+0x1a/0x20
Nov 26 11:46:48 hofvarpnir kernel: [13251.485438]  [<ffffffff817ed4d6>] ? mutex_lock_interruptible+0x16/0x50
Nov 26 11:46:48 hofvarpnir kernel: [13251.485440]  [<ffffffff811deabd>] ? __kmalloc+0x1ad/0x250
Nov 26 11:46:48 hofvarpnir kernel: [13251.485447]  [<ffffffffc01e7792>] i915_gem_execbuffer2+0xb2/0x240 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485455]  [<ffffffffc003c495>] drm_ioctl+0x125/0x610 [drm]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485458]  [<ffffffff810f85a0>] ? futex_wake+0x90/0x170
Nov 26 11:46:48 hofvarpnir kernel: [13251.485468]  [<ffffffffc01e76e0>] ? i915_gem_execbuffer+0x310/0x310 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.485471]  [<ffffffff810fb34d>] ? do_futex+0x10d/0x510
Nov 26 11:46:48 hofvarpnir kernel: [13251.485473]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
Nov 26 11:46:48 hofvarpnir kernel: [13251.485476]  [<ffffffff810fb7d1>] ? SyS_futex+0x81/0x180
Nov 26 11:46:48 hofvarpnir kernel: [13251.485478]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
Nov 26 11:46:48 hofvarpnir kernel: [13251.485481]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
Nov 26 11:46:48 hofvarpnir kernel: [13251.485483] ---[ end trace b7612045be6da7f5 ]---
Nov 26 11:46:48 hofvarpnir kernel: [13251.486292] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
Nov 26 11:46:48 hofvarpnir kernel: [13251.486317] IP: [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.486346] PGD 460e1067 PUD 40449067 PMD 0
Nov 26 11:46:48 hofvarpnir kernel: [13251.486360] Oops: 0000 [#1] SMP
Nov 26 11:46:48 hofvarpnir kernel: [13251.486370] Modules linked in: vhost_net vhost macvtap macvlan usb_serial_simple usbserial rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc bnep arc4 intel_rapl iosf_mbi iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp input_leds serio_raw mac80211 joydev cdc_mbim cdc_wdm cdc_ncm snd_usb_audio lpc_ich snd_usbmidi_lib cdc_acm snd_seq_midi snd_seq_midi_event usbnet rtsx_pci_ms snd_rawmidi iwlwifi mii uvcvideo videobuf2_vmalloc videobuf2_memops snd_seq thinkpad_acpi cfg80211 memstick videobuf2_core nvram v4l2_common snd_hda_codec_realtek videodev snd_seq_device snd_hda_codec_generic media snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep shpchp mei_me mei snd_pcm snd_timer snd soundcore mac_hid kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs drbg ansi_cprng algif_skcipher af_alg dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i2c_algo_bit ahci drm_kms_helper libahci e1000e rtsx_pci drm ptp pps_core wmi video
Nov 26 11:46:48 hofvarpnir kernel: [13251.486807] CPU: 3 PID: 5314 Comm: kscreenlocker_g Tainted: G        W       4.2.0-17-generic #21-Ubuntu
Nov 26 11:46:48 hofvarpnir kernel: [13251.486832] Hardware name: LENOVO 20BX002KRT/20BX002KRT, BIOS JBET51WW (1.16 ) 07/08/2015
Nov 26 11:46:48 hofvarpnir kernel: [13251.486854] task: ffff88025208b700 ti: ffff88024eebc000 task.ti: ffff88024eebc000
Nov 26 11:46:48 hofvarpnir kernel: [13251.486874] RIP: 0010:[<ffffffffc01eba16>]  [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.486907] RSP: 0018:ffff88024eebf998  EFLAGS: 00010202
Nov 26 11:46:48 hofvarpnir kernel: [13251.486922] RAX: 00000000055e5000 RBX: ffff8801b72dc000 RCX: 0000000000000000
Nov 26 11:46:48 hofvarpnir kernel: [13251.486941] RDX: 00000000000055e5 RSI: 0000000000000000 RDI: ffff88024eebf9b8
Nov 26 11:46:48 hofvarpnir kernel: [13251.486960] RBP: ffff88024eebfa08 R08: 0000000000000000 R09: ffff88024ed17cc0
Nov 26 11:46:48 hofvarpnir kernel: [13251.486979] R10: ffffffffc01e7d4e R11: 0000000005dce000 R12: 0000000000000001
Nov 26 11:46:48 hofvarpnir kernel: [13251.487010] R13: 0000000000000000 R14: 00000000000055e5 R15: ffff8801b72dc000
Nov 26 11:46:48 hofvarpnir kernel: [13251.487031] FS:  00007f0c28aef840(0000) GS:ffff88025dcc0000(0000) knlGS:0000000000000000
Nov 26 11:46:48 hofvarpnir kernel: [13251.487054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
Nov 26 11:46:48 hofvarpnir kernel: [13251.487071] CR2: 0000000000000008 CR3: 000000004f6ed000 CR4: 00000000003426e0
Nov 26 11:46:48 hofvarpnir kernel: [13251.487101] Stack:
Nov 26 11:46:48 hofvarpnir kernel: [13251.487107]  000000003aa1b000 0000000005dce000 ffff88024c2ac100 ffff8801b72dc000
Nov 26 11:46:48 hofvarpnir kernel: [13251.487129]  ffff88005f5e7680 ffff8802543ba000 000000000000002e 00000000af8b4627
Nov 26 11:46:48 hofvarpnir kernel: [13251.487150]  000000000000002e ffff8801b72dc000 ffff8801f0761a00 ffffffffc02a0def
Nov 26 11:46:48 hofvarpnir kernel: [13251.487172] Call Trace:
Nov 26 11:46:48 hofvarpnir kernel: [13251.487186]  [<ffffffffc01e7957>] ppgtt_bind_vma+0x37/0x40 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487209]  [<ffffffffc01ecc54>] i915_vma_bind+0x134/0x190 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487232]  [<ffffffffc01f4586>] i915_gem_object_do_pin+0x706/0xac0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487252]  [<ffffffff811de4ba>] ? kmem_cache_alloc+0x1ca/0x200
Nov 26 11:46:48 hofvarpnir kernel: [13251.487275]  [<ffffffffc01f497a>] i915_gem_object_pin+0x3a/0x40 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487299]  [<ffffffffc01e4dca>] i915_gem_execbuffer_reserve_vma.isra.21+0x7a/0x140 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487326]  [<ffffffffc01e516f>] i915_gem_execbuffer_reserve+0x2df/0x320 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487352]  [<ffffffffc01e5bc2>] i915_gem_do_execbuffer.isra.27+0x5d2/0x10a0 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.487374]  [<ffffffff813da56a>] ? find_next_zero_bit+0x1a/0x20
Nov 26 11:46:48 hofvarpnir kernel: [13251.487392]  [<ffffffff817ed4d6>] ? mutex_lock_interruptible+0x16/0x50
Nov 26 11:46:48 hofvarpnir kernel: [13251.487410]  [<ffffffff811deabd>] ? __kmalloc+0x1ad/0x250
Nov 26 11:46:48 hofvarpnir kernel: [13251.488317]  [<ffffffffc01e7792>] i915_gem_execbuffer2+0xb2/0x240 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.489257]  [<ffffffffc003c495>] drm_ioctl+0x125/0x610 [drm]
Nov 26 11:46:48 hofvarpnir kernel: [13251.490635]  [<ffffffff810f85a0>] ? futex_wake+0x90/0x170
Nov 26 11:46:48 hofvarpnir kernel: [13251.492325]  [<ffffffffc01e76e0>] ? i915_gem_execbuffer+0x310/0x310 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.493797]  [<ffffffff810fb34d>] ? do_futex+0x10d/0x510
Nov 26 11:46:48 hofvarpnir kernel: [13251.494792]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
Nov 26 11:46:48 hofvarpnir kernel: [13251.495796]  [<ffffffff810fb7d1>] ? SyS_futex+0x81/0x180
Nov 26 11:46:48 hofvarpnir kernel: [13251.496804]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
Nov 26 11:46:48 hofvarpnir kernel: [13251.497820]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
Nov 26 11:46:48 hofvarpnir kernel: [13251.498847] Code: b0 41 89 cc 49 c1 ed 1e 31 c9 48 83 ec 48 41 83 e5 03 65 48 8b 04 25 28 00 00 00 48 89 45 c8 31 c0 48 89 d0 48 c1 ea 0c 41 89 d6 <8b> 56 08 48 8b 36 48 c1 e8 15 41 81 e6 ff 01 00 00 25 ff 01 00
Nov 26 11:46:48 hofvarpnir kernel: [13251.499992] RIP  [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
Nov 26 11:46:48 hofvarpnir kernel: [13251.501336]  RSP <ffff88024eebf998>
Nov 26 11:46:48 hofvarpnir kernel: [13251.502463] CR2: 0000000000000008
Nov 26 11:46:48 hofvarpnir kernel: [13251.510830] ---[ end trace b7612045be6da7f6 ]---

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: linux-image-4.2.0-17-generic 4.2.0-17.21
ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
Uname: Linux 4.2.0-17-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC2:  me         1777 F.... pulseaudio
 /dev/snd/controlC1:  me         1777 F.... pulseaudio
 /dev/snd/controlC0:  me         1777 F.... pulseaudio
CurrentDesktop: KDE
Date: Thu Nov 26 12:56:59 2015
HibernationDevice: RESUME=UUID=0512fcfc-e0d9-49c9-bb0f-527d28277420
InstallationDate: Installed on 2015-10-09 (47 days ago)
InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151009)
MachineType: LENOVO 20BX002KRT
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-17-generic root=/dev/mapper/kubuntu--vg-root ro quiet splash nomdmonddf nomdmonisw vt.handoff=7
RelatedPackageVersions:
 linux-restricted-modules-4.2.0-17-generic N/A
 linux-backports-modules-4.2.0-17-generic  N/A
 linux-firmware                            1.149.2
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: 07/08/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET51WW (1.16 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BX002KRT
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:bvrJBET51WW(1.16):bd07/08/2015:svnLENOVO:pn20BX002KRT:pvrThinkPadT450s:rvnLENOVO:rn20BX002KRT:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BX002KRT
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: kernel-oops

** Attachment added: "/proc/version_signature"
   https://bugs.launchpad.net/bugs/1520090/+attachment/4525611/+files/version.log

-- 
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https://bugs.launchpad.net/bugs/1520090

Title:
  unable to handle kernel NULL pointer dereference; IP:
  [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]

Status in linux package in Ubuntu:
  New

Bug description:
  System crashed second day in a row and only poweroff is possible.

  Ubuntu 15.10

  from syslog:

  Nov 26 11:46:47 hofvarpnir kernel: [13250.527059] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.527473] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.528514] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.529439] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.529853] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.530895] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.531821] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.532140] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.532310] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:47 hofvarpnir kernel: [13250.532479] [drm:gen8_irq_handler [i915]] *ERROR* The master control interrupt lied (SDE)!
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485121] ------------[ cut here ]------------
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485146] WARNING: CPU: 3 PID: 5314 at /build/linux-d3RvQM/linux-4.2.0/drivers/gpu/drm/i915/i915_gem_gtt.c:523 gen8_ppgtt_clear_range+0x1ee/0x230 [i915]()
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485147] WARN_ON(!pd->page_table[pde])
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485148] Modules linked in: vhost_net vhost macvtap macvlan usb_serial_simple usbserial rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc bnep arc4 intel_rapl iosf_mbi iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp input_leds serio_raw mac80211 joydev cdc_mbim cdc_wdm cdc_ncm snd_usb_audio lpc_ich snd_usbmidi_lib cdc_acm snd_seq_midi snd_seq_midi_event usbnet rtsx_pci_ms snd_rawmidi iwlwifi mii uvcvideo videobuf2_vmalloc videobuf2_memops snd_seq thinkpad_acpi cfg80211 memstick videobuf2_core nvram v4l2_common snd_hda_codec_realtek videodev snd_seq_device snd_hda_codec_generic media snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep shpchp mei_me mei snd_pcm snd_timer snd soundcore mac_hid kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs drbg ansi_cprng algif_skcipher af_alg dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i2c_algo_bit ahci drm_kms_helper libahci e1000e rtsx_pci drm ptp pps_core wmi video
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485218] CPU: 3 PID: 5314 Comm: kscreenlocker_g Tainted: G        W       4.2.0-17-generic #21-Ubuntu
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485219] Hardware name: LENOVO 20BX002KRT/20BX002KRT, BIOS JBET51WW (1.16 ) 07/08/2015
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485220]  0000000000000000 00000000af8b4627 ffff88024eebf2c8 ffffffff817e8c09
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485223]  0000000000000000 ffff88024eebf320 ffff88024eebf308 ffffffff8107b3c6
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485224]  ffffea000662af80 00000000359e5083 000000000000002b ffff8801b72dc000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485226] Call Trace:
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485231]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485234]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485236]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485251]  [<ffffffffc01f13c9>] ? i915_gem_object_put_pages_gtt+0x129/0x1d0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485261]  [<ffffffffc01ea1ae>] gen8_ppgtt_clear_range+0x1ee/0x230 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485269]  [<ffffffffc01e798a>] ppgtt_unbind_vma+0x2a/0x30 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485278]  [<ffffffffc01f3bac>] i915_vma_unbind+0xac/0x220 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485287]  [<ffffffffc01f6c12>] i915_gem_shrink+0x172/0x270 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485296]  [<ffffffffc01f6dbb>] i915_gem_shrinker_scan+0xab/0xc0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485300]  [<ffffffff81194e2e>] shrink_slab+0x20e/0x3b0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485304]  [<ffffffff81199649>] shrink_zone+0x2b9/0x2d0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485309]  [<ffffffff811997cd>] do_try_to_free_pages+0x16d/0x400
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485312]  [<ffffffff81199b6a>] try_to_free_pages+0x10a/0x150
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485316]  [<ffffffff8118b96b>] __alloc_pages_nodemask+0x5eb/0xa10
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485320]  [<ffffffff811d2ff1>] alloc_pages_current+0x91/0x100
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485334]  [<ffffffffc01e97c7>] alloc_pt_single+0x77/0xe0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485346]  [<ffffffffc01ea677>] gen8_alloc_va_range+0x317/0x8e0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485349]  [<ffffffff810ac33c>] ? __enqueue_entity+0x6c/0x70
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485362]  [<ffffffffc01ecc38>] i915_vma_bind+0x118/0x190 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485377]  [<ffffffffc01f4586>] i915_gem_object_do_pin+0x706/0xac0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485380]  [<ffffffff811de4ba>] ? kmem_cache_alloc+0x1ca/0x200
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485395]  [<ffffffffc01f497a>] i915_gem_object_pin+0x3a/0x40 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485407]  [<ffffffffc01e4dca>] i915_gem_execbuffer_reserve_vma.isra.21+0x7a/0x140 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485418]  [<ffffffffc01e516f>] i915_gem_execbuffer_reserve+0x2df/0x320 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485429]  [<ffffffffc01e5bc2>] i915_gem_do_execbuffer.isra.27+0x5d2/0x10a0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485432]  [<ffffffff813da56a>] ? find_next_zero_bit+0x1a/0x20
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485438]  [<ffffffff817ed4d6>] ? mutex_lock_interruptible+0x16/0x50
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485440]  [<ffffffff811deabd>] ? __kmalloc+0x1ad/0x250
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485447]  [<ffffffffc01e7792>] i915_gem_execbuffer2+0xb2/0x240 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485455]  [<ffffffffc003c495>] drm_ioctl+0x125/0x610 [drm]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485458]  [<ffffffff810f85a0>] ? futex_wake+0x90/0x170
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485468]  [<ffffffffc01e76e0>] ? i915_gem_execbuffer+0x310/0x310 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485471]  [<ffffffff810fb34d>] ? do_futex+0x10d/0x510
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485473]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485476]  [<ffffffff810fb7d1>] ? SyS_futex+0x81/0x180
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485478]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485481]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Nov 26 11:46:48 hofvarpnir kernel: [13251.485483] ---[ end trace b7612045be6da7f5 ]---
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486292] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486317] IP: [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486346] PGD 460e1067 PUD 40449067 PMD 0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486360] Oops: 0000 [#1] SMP
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486370] Modules linked in: vhost_net vhost macvtap macvlan usb_serial_simple usbserial rfcomm xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables binfmt_misc bnep arc4 intel_rapl iosf_mbi iwlmvm x86_pkg_temp_thermal intel_powerclamp coretemp input_leds serio_raw mac80211 joydev cdc_mbim cdc_wdm cdc_ncm snd_usb_audio lpc_ich snd_usbmidi_lib cdc_acm snd_seq_midi snd_seq_midi_event usbnet rtsx_pci_ms snd_rawmidi iwlwifi mii uvcvideo videobuf2_vmalloc videobuf2_memops snd_seq thinkpad_acpi cfg80211 memstick videobuf2_core nvram v4l2_common snd_hda_codec_realtek videodev snd_seq_device snd_hda_codec_generic media snd_hda_codec_hdmi btusb btrtl btbcm btintel bluetooth snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep shpchp mei_me mei snd_pcm snd_timer snd soundcore mac_hid kvm_intel kvm parport_pc ppdev lp parport autofs4 btrfs drbg ansi_cprng algif_skcipher af_alg dm_crypt raid10 raid456 async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq raid1 raid0 multipath linear hid_generic usbhid hid rtsx_pci_sdmmc crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel i915 aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd psmouse i2c_algo_bit ahci drm_kms_helper libahci e1000e rtsx_pci drm ptp pps_core wmi video
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486807] CPU: 3 PID: 5314 Comm: kscreenlocker_g Tainted: G        W       4.2.0-17-generic #21-Ubuntu
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486832] Hardware name: LENOVO 20BX002KRT/20BX002KRT, BIOS JBET51WW (1.16 ) 07/08/2015
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486854] task: ffff88025208b700 ti: ffff88024eebc000 task.ti: ffff88024eebc000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486874] RIP: 0010:[<ffffffffc01eba16>]  [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486907] RSP: 0018:ffff88024eebf998  EFLAGS: 00010202
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486922] RAX: 00000000055e5000 RBX: ffff8801b72dc000 RCX: 0000000000000000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486941] RDX: 00000000000055e5 RSI: 0000000000000000 RDI: ffff88024eebf9b8
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486960] RBP: ffff88024eebfa08 R08: 0000000000000000 R09: ffff88024ed17cc0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.486979] R10: ffffffffc01e7d4e R11: 0000000005dce000 R12: 0000000000000001
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487010] R13: 0000000000000000 R14: 00000000000055e5 R15: ffff8801b72dc000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487031] FS:  00007f0c28aef840(0000) GS:ffff88025dcc0000(0000) knlGS:0000000000000000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487054] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487071] CR2: 0000000000000008 CR3: 000000004f6ed000 CR4: 00000000003426e0
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487101] Stack:
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487107]  000000003aa1b000 0000000005dce000 ffff88024c2ac100 ffff8801b72dc000
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487129]  ffff88005f5e7680 ffff8802543ba000 000000000000002e 00000000af8b4627
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487150]  000000000000002e ffff8801b72dc000 ffff8801f0761a00 ffffffffc02a0def
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487172] Call Trace:
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487186]  [<ffffffffc01e7957>] ppgtt_bind_vma+0x37/0x40 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487209]  [<ffffffffc01ecc54>] i915_vma_bind+0x134/0x190 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487232]  [<ffffffffc01f4586>] i915_gem_object_do_pin+0x706/0xac0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487252]  [<ffffffff811de4ba>] ? kmem_cache_alloc+0x1ca/0x200
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487275]  [<ffffffffc01f497a>] i915_gem_object_pin+0x3a/0x40 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487299]  [<ffffffffc01e4dca>] i915_gem_execbuffer_reserve_vma.isra.21+0x7a/0x140 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487326]  [<ffffffffc01e516f>] i915_gem_execbuffer_reserve+0x2df/0x320 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487352]  [<ffffffffc01e5bc2>] i915_gem_do_execbuffer.isra.27+0x5d2/0x10a0 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487374]  [<ffffffff813da56a>] ? find_next_zero_bit+0x1a/0x20
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487392]  [<ffffffff817ed4d6>] ? mutex_lock_interruptible+0x16/0x50
  Nov 26 11:46:48 hofvarpnir kernel: [13251.487410]  [<ffffffff811deabd>] ? __kmalloc+0x1ad/0x250
  Nov 26 11:46:48 hofvarpnir kernel: [13251.488317]  [<ffffffffc01e7792>] i915_gem_execbuffer2+0xb2/0x240 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.489257]  [<ffffffffc003c495>] drm_ioctl+0x125/0x610 [drm]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.490635]  [<ffffffff810f85a0>] ? futex_wake+0x90/0x170
  Nov 26 11:46:48 hofvarpnir kernel: [13251.492325]  [<ffffffffc01e76e0>] ? i915_gem_execbuffer+0x310/0x310 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.493797]  [<ffffffff810fb34d>] ? do_futex+0x10d/0x510
  Nov 26 11:46:48 hofvarpnir kernel: [13251.494792]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  Nov 26 11:46:48 hofvarpnir kernel: [13251.495796]  [<ffffffff810fb7d1>] ? SyS_futex+0x81/0x180
  Nov 26 11:46:48 hofvarpnir kernel: [13251.496804]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  Nov 26 11:46:48 hofvarpnir kernel: [13251.497820]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  Nov 26 11:46:48 hofvarpnir kernel: [13251.498847] Code: b0 41 89 cc 49 c1 ed 1e 31 c9 48 83 ec 48 41 83 e5 03 65 48 8b 04 25 28 00 00 00 48 89 45 c8 31 c0 48 89 d0 48 c1 ea 0c 41 89 d6 <8b> 56 08 48 8b 36 48 c1 e8 15 41 81 e6 ff 01 00 00 25 ff 01 00
  Nov 26 11:46:48 hofvarpnir kernel: [13251.499992] RIP  [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
  Nov 26 11:46:48 hofvarpnir kernel: [13251.501336]  RSP <ffff88024eebf998>
  Nov 26 11:46:48 hofvarpnir kernel: [13251.502463] CR2: 0000000000000008
  Nov 26 11:46:48 hofvarpnir kernel: [13251.510830] ---[ end trace b7612045be6da7f6 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-17-generic 4.2.0-17.21
  ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
  Uname: Linux 4.2.0-17-generic x86_64
  ApportVersion: 2.19.1-0ubuntu5
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  me         1777 F.... pulseaudio
   /dev/snd/controlC1:  me         1777 F.... pulseaudio
   /dev/snd/controlC0:  me         1777 F.... pulseaudio
  CurrentDesktop: KDE
  Date: Thu Nov 26 12:56:59 2015
  HibernationDevice: RESUME=UUID=0512fcfc-e0d9-49c9-bb0f-527d28277420
  InstallationDate: Installed on 2015-10-09 (47 days ago)
  InstallationMedia: Kubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151009)
  MachineType: LENOVO 20BX002KRT
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-17-generic root=/dev/mapper/kubuntu--vg-root ro quiet splash nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-17-generic N/A
   linux-backports-modules-4.2.0-17-generic  N/A
   linux-firmware                            1.149.2
  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: 07/08/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: JBET51WW (1.16 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20BX002KRT
  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:bvrJBET51WW(1.16):bd07/08/2015:svnLENOVO:pn20BX002KRT:pvrThinkPadT450s:rvnLENOVO:rn20BX002KRT:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
  dmi.product.name: 20BX002KRT
  dmi.product.version: ThinkPad T450s
  dmi.sys.vendor: LENOVO

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Follow ups

[Bug 1520090] Re: unable to handle kernel NULL pointer dereference; IP: [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
From: Launchpad Bug Tracker, 2016-01-30
[Bug 1520090] Re: unable to handle kernel NULL pointer dereference; IP: [<ffffffffc01eba16>] gen8_ppgtt_insert_entries+0x46/0x230 [i915]
From: Joseph Salisbury, 2015-11-30
[Bug 1520090] Status changed to Confirmed
From: Brad Figg, 2015-11-26