Unfortunately I was still able to reproduce. Here's the current trace, this time without arbitrary line cutoffs.
While this report, too, has chrome as the "comm" I've also seen compiz being the "culprit." IP: gen8_ppgtt_alloc_page_directories.isra.40+0x115/0x250 [i915] PGD 0 Oops: 0002 [#1] SMP Modules linked in: btrfs xor raid6_pq ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs ccm 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 libcrc32c ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter rfcomm cmac bnep binfmt_misc cmdlinepart intel_spi_platform intel_spi spi_nor mtd dell_wmi sparse_keymap arc4 intel_rapl x86_pkg_temp_thermal dell_laptop intel_powerclamp coretemp iwlmvm dell_smm_hwmon kvm_intel kvm mac80211 irqbypass intel_cstate uvcvideo intel_rapl_perf videobuf2_vmalloc videobuf2_memops btusb videobuf2_v4l2 btrtl videobuf2_core btbcm btintel dell_led joydev videodev iwlwifi dell_smbios dcdbas media bluetooth snd_hda_codec_hdmi serio_raw snd_hda_codec_realtek snd_hda_codec_generic cfg80211 input_leds snd_soc_rt5640 snd_soc_rl6231 snd_hda_intel mei_me snd_soc_ssm4567 snd_hda_codec shpchp mei lpc_ich snd_hda_core snd_soc_core snd_hwdep snd_compress ac97_bus snd_pcm_dmaengine snd_pcm snd_seq_midi snd_seq_midi_event snd_rawmidi int3403_thermal snd_seq snd_seq_device snd_timer elan_i2c snd acpi_als dw_dmac soundcore kfifo_buf dw_dmac_core industrialio snd_soc_sst_acpi i2c_designware_platform snd_soc_sst_match int3402_thermal 8250_dw i2c_designware_core spi_pxa2xx_platform mac_hid processor_thermal_device dell_rbtn int3400_thermal intel_soc_dts_iosf int340x_thermal_zone acpi_thermal_rel int3406_thermal acpi_pad parport_pc ppdev lp parport ip_tables x_tables autofs4 algif_skcipher af_alg dm_crypt hid_generic usbhid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc i915 aesni_intel aes_x86_64 crypto_simd i2c_algo_bit glue_helper drm_kms_helper cryptd ahci psmouse syscopyarea libahci sysfillrect sysimgblt fb_sys_fops sdhci_pci e1000e drm ptp pps_core wmi video sdhci_acpi sdhci i2c_hid hid CPU: 1 PID: 3403 Comm: chrome Not tainted 4.11.0-041100rc5-generic #201704022131 Hardware name: Dell Inc. Latitude E7250/0V8RX3, BIOS A09 11/18/2015 task: ffff969e1cf00000 task.stack: ffffbe03435b8000 RIP: 0010:gen8_ppgtt_alloc_page_directories.isra.40+0x115/0x250 [i915] RSP: 0018:ffffbe03435bb8c0 EFLAGS: 00010246 RAX: ffff969cf4346f80 RBX: 0000000000000003 RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffff969e1b5f3000 RDI: ffff969e8ac80000 RBP: ffffbe03435bb918 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff969c89f3c000 R13: ffff969d2a61e090 R14: 00000000fffef000 R15: 0000000000008000 FS: 00007ff2cab90b00(0000) GS:ffff969e9e480000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 000000019c1c6000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gen8_alloc_va_range_3lvl+0xd1/0x920 [i915] ? __alloc_pages_nodemask+0xdf/0x240 ? alloc_pages_vma+0xab/0x250 ? add_hole+0xd8/0x100 [drm] gen8_alloc_va_range+0x25b/0x410 [i915] i915_vma_bind+0x81/0x170 [i915] __i915_vma_do_pin+0x30b/0x3b0 [i915] i915_gem_execbuffer_reserve_vma.isra.30+0x14d/0x1b0 [i915] i915_gem_execbuffer_reserve.isra.31+0x3a7/0x3d0 [i915] i915_gem_do_execbuffer.isra.37+0x4af/0x15b0 [i915] ? find_get_entry+0x20/0x100 ? shmem_getpage_gfp+0x104/0xc70 i915_gem_execbuffer2+0xa1/0x1e0 [i915] drm_ioctl+0x218/0x4b0 [drm] ? i915_gem_execbuffer+0x310/0x310 [i915] do_vfs_ioctl+0xa3/0x600 ? __secure_computing+0x3f/0xe0 ? syscall_trace_enter+0xcd/0x2e0 SyS_ioctl+0x79/0x90 do_syscall_64+0x5b/0xc0 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7ff2c3f23907 RSP: 002b:00007ffc4169eec8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000009f2220b3000 RCX: 00007ff2c3f23907 RDX: 00007ffc4169ef10 RSI: 00000000c0406469 RDI: 000000000000000e RBP: 00007ffc4169ef10 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000038 R11: 0000000000000246 R12: 00000000c0406469 R13: 000000000000000e R14: 0000000000000000 R15: 0000000000000000 Code: e6 48 8b 90 28 03 00 00 48 8b b8 e0 02 00 00 48 8b 52 08 48 83 ca 03 e8 9a d1 ff ff 48 8b 45 b0 48 8b 4d c8 48 8b 10 48 8b 45 d0 <4c> 89 24 ca 48 0f ab 08 0f 1f 44 00 00 e9 53 ff ff ff 65 8b 05 RIP: gen8_ppgtt_alloc_page_directories.isra.40+0x115/0x250 [i915] RSP: ffffbe03435bb8c0 CR2: 0000000000000018 ---[ end trace d5d6c6116f3943bc ]--- ** Tags added: bug-exists-upstream ** Changed in: linux (Ubuntu) Status: Incomplete => Confirmed ** Tags removed: bug-exists-upstream ** Tags added: kernel-bug-exists-upstream -- 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/1677673 Title: System soft-freezes, BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 in journalctl Status in linux package in Ubuntu: Confirmed Bug description: I just upgraded to 17.04. It appears that now leaving the system locked for long enough now makes it unable to respond to any input but SysRq. This apepars to be the only relevant bit in `journalctl --boot -1`: BUG: unable to handle kernel NULL pointer dereference at 0000000000000018 IP: gen8_ppgtt_alloc_page_directories.isra.38+0x115/0x250 [i915] PGD 0 Oops: 0002 [#1] SMP Modules linked in: ccm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ip snd_soc_ssm4567 snd_hda_codec_realtek snd_hda_codec_generic snd_hda_codec_hdmi snd_soc_core cfg80211 snd_compress ac97_bus snd_pcm_dmaengine snd_hda_intel lpc_ich snd_seq_ ghash_clmulni_intel pcbc i915 aesni_intel aes_x86_64 crypto_simd glue_helper cryptd sdhci_pci i2c_algo_bit drm_kms_helper syscopyarea psmouse ahci sysfillrect libahci e100 CPU: 3 PID: 3826 Comm: chrome Tainted: G OE 4.10.0-14-generic #16-Ubuntu Hardware name: Dell Inc. Latitude E7250/0V8RX3, BIOS A09 11/18/2015 task: ffff99ddb372da00 task.stack: ffffb0ec037dc000 RIP: 0010:gen8_ppgtt_alloc_page_directories.isra.38+0x115/0x250 [i915] RSP: 0018:ffffb0ec037df880 EFLAGS: 00010246 RAX: ffff99dd0367b880 RBX: 0000000000000003 RCX: 0000000000000003 RDX: 0000000000000000 RSI: ffff99ddb737e000 RDI: ffff99de4ad90000 RBP: ffffb0ec037df8d8 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000001 R12: ffff99ddc994a000 R13: ffff99dcd02e2bf0 R14: 00000000fffdf000 R15: 0000000000008000 FS: 00007fd3a0fa7b00(0000) GS:ffff99de5e580000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000018 CR3: 0000000174607000 CR4: 00000000003406e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: gen8_alloc_va_range_3lvl+0xfb/0x9e0 [i915] ? __alloc_pages_nodemask+0xff/0x260 gen8_alloc_va_range+0x23d/0x470 [i915] i915_vma_bind+0x7e/0x170 [i915] __i915_vma_do_pin+0x2a5/0x450 [i915] i915_gem_execbuffer_reserve_vma.isra.31+0x144/0x1b0 [i915] i915_gem_execbuffer_reserve.isra.32+0x39e/0x3d0 [i915] i915_gem_do_execbuffer.isra.38+0x4a2/0x1750 [i915] ? radix_tree_lookup_slot+0x22/0x50 ? shmem_getpage_gfp+0xf9/0xc10 i915_gem_execbuffer2+0xa1/0x1e0 [i915] drm_ioctl+0x21b/0x4c0 [drm] ? i915_gem_execbuffer+0x310/0x310 [i915] ? __seccomp_filter+0x67/0x250 do_vfs_ioctl+0xa3/0x610 ? __secure_computing+0x3f/0xd0 ? syscall_trace_enter+0xcd/0x2e0 SyS_ioctl+0x79/0x90 do_syscall_64+0x5b/0xc0 entry_SYSCALL64_slow_path+0x25/0x25 RIP: 0033:0x7fd39a33a907 RSP: 002b:00007ffff6323818 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000018a20a505000 RCX: 00007fd39a33a907 RDX: 00007ffff6323860 RSI: 00000000c0406469 RDI: 000000000000000e RBP: 00007ffff6323860 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000038 R11: 0000000000000246 R12: 00000000c0406469 R13: 000000000000000e R14: 0000000000000000 R15: 0000000000000000 Code: e6 48 8b 90 20 03 00 00 48 8b b8 d8 02 00 00 48 8b 52 08 48 83 ca 03 e8 ca cd ff ff 48 8b 45 b0 48 8b 4d c8 48 8b 10 48 8b 45 d0 <4c> 89 24 ca 48 0f ab 08 0f 1f 44 00 RIP: gen8_ppgtt_alloc_page_directories.isra.38+0x115/0x250 [i915] RSP: ffffb0ec037df880 CR2: 0000000000000018 ---[ end trace 2a4103476767c23b ]--- I walked to my computer 12 minutes later, finding it soft-locked as described above. I realize that this appears somewhat far removed from the real cause of the problem, so please let me know what other data I can provide to facilitate the debugging process. ProblemType: Bug DistroRelease: Ubuntu 17.04 Package: linux-image-4.10.0-14-generic 4.10.0-14.16 ProcVersionSignature: Ubuntu 4.10.0-14.16-generic 4.10.3 Uname: Linux 4.10.0-14-generic x86_64 ApportVersion: 2.20.4-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: sraffa 2780 F.... pulseaudio /dev/snd/controlC0: sraffa 2780 F.... pulseaudio CurrentDesktop: Unity:Unity7 Date: Thu Mar 30 17:44:00 2017 EcryptfsInUse: Yes HibernationDevice: RESUME=UUID=aca70873-b3e7-46b8-a5df-18e8752a0640 InstallationDate: Installed on 2015-11-02 (514 days ago) InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021) MachineType: Dell Inc. Latitude E7250 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.10.0-14-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-4.10.0-14-generic N/A linux-backports-modules-4.10.0-14-generic N/A linux-firmware 1.164 SourcePackage: linux UpgradeStatus: Upgraded to zesty on 2017-03-29 (0 days ago) dmi.bios.date: 11/18/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A09 dmi.board.name: 0V8RX3 dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA09:bd11/18/2015:svnDellInc.:pnLatitudeE7250:pvr:rvnDellInc.:rn0V8RX3:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: Latitude E7250 dmi.sys.vendor: Dell Inc. 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