Did this issue start happening after an update/upgrade? Was there a prior kernel version where you were not having this particular problem?
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v4.9 kernel[0]. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.9-rc6 ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Also affects: linux (Ubuntu Yakkety) Importance: Undecided Status: New ** Changed in: linux (Ubuntu Yakkety) Status: New => Confirmed ** Changed in: linux (Ubuntu Yakkety) Importance: Undecided => Medium ** Tags added: kernel-da-key -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1644037 Title: Kernel NULL pointer dereference when trying to play a bluray Status in linux package in Ubuntu: Confirmed Status in linux source package in Yakkety: Confirmed Bug description: Tried to play a bluray using VLC, and got the following kernel NULL pointer dereference: Nov 22 14:22:56 spiny kernel: BUG: unable to handle kernel NULL pointer dereference at (null) Nov 22 14:22:56 spiny kernel: IP: [<ffffffffc056aa6d>] gen6_ppgtt_insert_entries+0x14d/0x1d0 [i915] Nov 22 14:22:56 spiny kernel: PGD 0 Nov 22 14:22:56 spiny kernel: Oops: 0000 [#1] SMP Nov 22 14:22:56 spiny kernel: Modules linked in: nls_utf8 udf crc_itu_t xt_nat xt_tcpudp veth rfcomm ipt_MASQUERADE nf_nat_masquerade_ipv4 xfrm_user xfrm_algo iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 xt_a Nov 22 14:22:56 spiny kernel: mei snd soundcore thunderbolt sbs sbshc acpi_als kfifo_buf industrialio apple_gmux apple_bl mac_hid shpchp facetimehd(OE) videobuf2_dma_sg videobuf2_memops videobuf2_v4l2 videobuf2_core vid Nov 22 14:22:56 spiny kernel: CPU: 6 PID: 1734 Comm: vlc Tainted: G W OE 4.8.0-27-generic #29-Ubuntu Nov 22 14:22:56 spiny kernel: Hardware name: Apple Inc. MacBookPro11,4/Mac-06F11FD93F0323C5, BIOS MBP114.88Z.0172.B04.1506051511 06/05/2015 Nov 22 14:22:56 spiny kernel: task: ffff89bcaab64740 task.stack: ffff89bca10f0000 Nov 22 14:22:56 spiny kernel: RIP: 0010:[<ffffffffc056aa6d>] [<ffffffffc056aa6d>] gen6_ppgtt_insert_entries+0x14d/0x1d0 [i915] Nov 22 14:22:56 spiny kernel: RSP: 0018:ffff89bca10f39d8 EFLAGS: 00010246 Nov 22 14:22:56 spiny kernel: RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff89bfacb70000 Nov 22 14:22:56 spiny kernel: RDX: ffff89bcecc12f20 RSI: ffff89bfa29ab000 RDI: 00000002e2af2000 Nov 22 14:22:56 spiny kernel: RBP: ffff89bca10f3a28 R08: 0000000000000000 R09: ffff89bfacb70000 Nov 22 14:22:56 spiny kernel: R10: 0000000000000000 R11: ffff89bfa2c40000 R12: ffff89bfa29abffc Nov 22 14:22:56 spiny kernel: R13: 0000000000000000 R14: ffff89bcecc12f20 R15: 0000000000000000 Nov 22 14:22:56 spiny kernel: FS: 00007fb4ad743700(0000) GS:ffff89bfbf380000(0000) knlGS:0000000000000000 Nov 22 14:22:56 spiny kernel: CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 Nov 22 14:22:56 spiny kernel: CR2: 0000000000000000 CR3: 0000000243f03000 CR4: 00000000001406e0 Nov 22 14:22:56 spiny kernel: Stack: Nov 22 14:22:56 spiny kernel: ffff89bcaab64740 0000000000000200 ffff89bfacb70000 0000100000000001 Nov 22 14:22:56 spiny kernel: 00000002e2af2000 0000000000000000 ffff89bcf3608c00 0000000000000002 Nov 22 14:22:56 spiny kernel: 0000000000000001 ffff89bf50dbf3c0 ffff89bca10f3a60 ffffffffc056c370 Nov 22 14:22:56 spiny kernel: Call Trace: Nov 22 14:22:56 spiny kernel: [<ffffffffc056c370>] aliasing_gtt_bind_vma+0x90/0xe0 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc057141e>] i915_vma_bind+0xce/0x180 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc0577eab>] i915_gem_object_do_pin+0x86b/0xa80 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc05780ed>] i915_gem_object_pin+0x2d/0x30 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc0565e8f>] i915_gem_execbuffer_reserve_vma.isra.20+0x9f/0x180 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc0566306>] i915_gem_execbuffer_reserve.isra.21+0x396/0x3c0 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc05676ba>] i915_gem_do_execbuffer.isra.24+0x67a/0x11a0 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffff98609f52>] ? ___slab_alloc+0x212/0x4b0 Nov 22 14:22:56 spiny kernel: [<ffffffff985aa0f1>] ? get_page_from_freelist+0xa61/0xb50 Nov 22 14:22:56 spiny kernel: [<ffffffffc0566369>] ? drm_malloc_gfp.constprop.25+0x39/0x70 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc0568e02>] i915_gem_execbuffer2+0xe2/0x210 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffffc03a9da0>] drm_ioctl+0x200/0x4f0 [drm] Nov 22 14:22:56 spiny kernel: [<ffffffffc0568d20>] ? i915_gem_execbuffer+0x330/0x330 [i915] Nov 22 14:22:56 spiny kernel: [<ffffffff985db991>] ? handle_mm_fault+0xf71/0x13c0 Nov 22 14:22:56 spiny kernel: [<ffffffff98647823>] do_vfs_ioctl+0xa3/0x610 Nov 22 14:22:56 spiny kernel: [<ffffffff9846b3b3>] ? __do_page_fault+0x203/0x4d0 Nov 22 14:22:56 spiny kernel: [<ffffffff98647e09>] SyS_ioctl+0x79/0x90 Nov 22 14:22:56 spiny kernel: [<ffffffff98c9f076>] entry_SYSCALL_64_fastpath+0x1e/0xa8 Nov 22 14:22:56 spiny kernel: Code: 5f 5d c3 c7 45 cc 00 00 00 00 31 db 48 c7 45 d0 00 00 00 00 45 31 f6 e9 2a ff ff ff 8b 45 b8 48 8b 4d c0 48 8b 84 c1 c8 01 00 00 <4c> 8b 38 48 8b 45 b0 83 80 f0 09 00 00 01 48 b8 00 00 Nov 22 14:22:56 spiny kernel: RIP [<ffffffffc056aa6d>] gen6_ppgtt_insert_entries+0x14d/0x1d0 [i915] Nov 22 14:22:56 spiny kernel: RSP <ffff89bca10f39d8> Nov 22 14:22:56 spiny kernel: CR2: 0000000000000000 Nov 22 14:22:56 spiny kernel: ---[ end trace abc0fdfa16a6ff7a ]--- ProblemType: Bug DistroRelease: Ubuntu 16.10 Package: linux-image-4.8.0-27-generic 4.8.0-27.29 ProcVersionSignature: Ubuntu 4.8.0-27.29-generic 4.8.1 Uname: Linux 4.8.0-27-generic x86_64 ApportVersion: 2.20.3-0ubuntu8 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: jbarnett 4296 F.... pulseaudio /dev/snd/controlC0: jbarnett 4296 F.... pulseaudio CurrentDesktop: GNOME Date: Tue Nov 22 14:31:49 2016 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=dd225ec0-47f4-49d8-a51c-a2547f8eb945 InstallationDate: Installed on 2015-08-21 (459 days ago) InstallationMedia: Ubuntu-GNOME 15.10 "Wily Werewolf" - Alpha amd64 (20150819) MachineType: Apple Inc. MacBookPro11,4 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-27-generic.efi.signed root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.8.0-27-generic N/A linux-backports-modules-4.8.0-27-generic N/A linux-firmware 1.161 SourcePackage: linux UpgradeStatus: Upgraded to yakkety on 2016-09-29 (54 days ago) dmi.bios.date: 06/05/2015 dmi.bios.vendor: Apple Inc. dmi.bios.version: MBP114.88Z.0172.B04.1506051511 dmi.board.name: Mac-06F11FD93F0323C5 dmi.board.vendor: Apple Inc. dmi.board.version: MacBookPro11,4 dmi.chassis.type: 9 dmi.chassis.vendor: Apple Inc. dmi.chassis.version: Mac-06F11FD93F0323C5 dmi.modalias: dmi:bvnAppleInc.:bvrMBP114.88Z.0172.B04.1506051511:bd06/05/2015:svnAppleInc.:pnMacBookPro11,4:pvr1.0:rvnAppleInc.:rnMac-06F11FD93F0323C5:rvrMacBookPro11,4:cvnAppleInc.:ct9:cvrMac-06F11FD93F0323C5: dmi.product.name: MacBookPro11,4 dmi.product.version: 1.0 dmi.sys.vendor: Apple Inc. 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