No I can not reproduce this. Which is not that surprising, deep kernel bugs are unlikely to be correlated with anything the user is doing at the UI level. System is still crashing sporadically, they do not occur on any of my other systems, nor did they happen on this system before a certain date, which inclines me to claim that they were not happening with older kernels.
It did lock up again this morning. Unfortunately the last 5 minutes of the syslog file were corrupted and contained no useful information, so I could not tell you if it was the same problem or not. -- 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/1827822 Title: kernel null pointer dereference Status in linux package in Ubuntu: Incomplete Bug description: System started freezing up a couple days ago. After the latest one, I looked at the syslog file and found what appears to be a kernel bug report. May 5 18:06:03 corbin-goul kernel: [ 4650.769677] BUG: unable to handle kernel NULL pointer dereference at 0000000000000008 May 5 18:06:03 corbin-goul kernel: [ 4650.769694] IP: rm_hole+0x19/0x70 [drm] May 5 18:06:03 corbin-goul kernel: [ 4650.769696] PGD 0 P4D 0 May 5 18:06:03 corbin-goul kernel: [ 4650.769698] Oops: 0002 [#1] SMP PTI May 5 18:06:03 corbin-goul kernel: [ 4650.769700] Modules linked in: nls_iso8859_1 snd_hda_codec_realtek snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel snd_hda_codec_generic snd_hda_intel snd _hda_codec kvm snd_hda_core snd_hwdep snd_pcm irqbypass mei_me intel_cstate mei intel_rapl_perf snd_seq_midi input_leds snd_seq_midi_event serio_raw snd_rawmidi snd_seq snd_seq_device snd_timer lpc_ich snd shpchp soundcore mac_hid s ch_fq_codel ib_iser rdma_cm iw_cm ib_cm ib_core iscsi_tcp libiscsi_tcp libiscsi scsi_transport_iscsi parport_pc ppdev lp parport ip_tables x_tables autofs4 btrfs zstd_compress raid10 raid456 async_raid6_recov async_memcpy async_pq a sync_xor async_tx xor raid6_pq libcrc32c raid0 multipath linear raid1 hid_generic usbhid hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel pcbc i915 May 5 18:06:03 corbin-goul kernel: [ 4650.769733] aesni_intel i2c_algo_bit aes_x86_64 crypto_simd drm_kms_helper glue_helper cryptd syscopyarea sysfillrect sysimgblt r8169 fb_sys_fops ahci mii drm libahci sata_inic162x video May 5 18:06:03 corbin-goul kernel: [ 4650.769743] CPU: 0 PID: 8713 Comm: kworker/0:0 Not tainted 4.15.0-48-generic #51-Ubuntu May 5 18:06:03 corbin-goul kernel: [ 4650.769744] Hardware name: Gigabyte Technology Co., Ltd. H87M-D3H/H87M-D3H, BIOS F3 04/24/2013 May 5 18:06:03 corbin-goul kernel: [ 4650.769770] Workqueue: events __i915_gem_free_work [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769778] RIP: 0010:rm_hole+0x19/0x70 [drm] May 5 18:06:03 corbin-goul kernel: [ 4650.769779] RSP: 0018:ffff95fb81f2bd20 EFLAGS: 00010202 May 5 18:06:03 corbin-goul kernel: [ 4650.769780] RAX: 0000000000000000 RBX: ffff89d51f1382c0 RCX: 0000000000000000 May 5 18:06:03 corbin-goul kernel: [ 4650.769781] RDX: 0000000000000000 RSI: ffff89d765cf8b40 RDI: ffff89d51f138318 May 5 18:06:03 corbin-goul kernel: [ 4650.769782] RBP: ffff95fb81f2bd28 R08: ffff89d5e7b71bc0 R09: 0000000000000000 May 5 18:06:03 corbin-goul kernel: [ 4650.769783] R10: ffff95fb81f2bde0 R11: 0000000000000001 R12: ffff89d765cf8b00 May 5 18:06:03 corbin-goul kernel: [ 4650.769784] R13: 0000000000000000 R14: ffff89d51f1382e0 R15: ffff89d75f6c37c8 May 5 18:06:03 corbin-goul kernel: [ 4650.769786] FS: 0000000000000000(0000) GS:ffff89d77e200000(0000) knlGS:0000000000000000 May 5 18:06:03 corbin-goul kernel: [ 4650.769787] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 May 5 18:06:03 corbin-goul kernel: [ 4650.769788] CR2: 0000000000000008 CR3: 00000002eac0a002 CR4: 00000000001606f0 May 5 18:06:03 corbin-goul kernel: [ 4650.769789] Call Trace: May 5 18:06:03 corbin-goul kernel: [ 4650.769797] drm_mm_remove_node+0x29d/0x360 [drm] May 5 18:06:03 corbin-goul kernel: [ 4650.769801] ? __internal_add_timer+0x1f/0x60 May 5 18:06:03 corbin-goul kernel: [ 4650.769816] i915_vma_remove+0x3a/0x100 [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769830] i915_vma_unbind+0x1cd/0x370 [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769843] i915_vma_close+0x7d/0xa0 [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769856] __i915_gem_free_objects+0xa3/0x2c0 [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769867] __i915_gem_free_work+0x60/0x90 [i915] May 5 18:06:03 corbin-goul kernel: [ 4650.769870] process_one_work+0x1de/0x410 May 5 18:06:03 corbin-goul kernel: [ 4650.769872] worker_thread+0x32/0x410 May 5 18:06:03 corbin-goul kernel: [ 4650.769874] kthread+0x121/0x140 May 5 18:06:03 corbin-goul kernel: [ 4650.769876] ? process_one_work+0x410/0x410 May 5 18:06:03 corbin-goul kernel: [ 4650.769878] ? kthread_create_worker_on_cpu+0x70/0x70 May 5 18:06:03 corbin-goul kernel: [ 4650.769881] ret_from_fork+0x35/0x40 May 5 18:06:03 corbin-goul kernel: [ 4650.769882] Code: 00 00 00 45 31 d2 eb bb 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 8b 57 30 48 8b 47 38 48 89 fb 48 8d 7f 58 <48> 89 42 08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 47 d8 May 5 18:06:03 corbin-goul kernel: [ 4650.769909] RIP: rm_hole+0x19/0x70 [drm] RSP: ffff95fb81f2bd20 May 5 18:06:03 corbin-goul kernel: [ 4650.769910] CR2: 0000000000000008 May 5 18:06:03 corbin-goul kernel: [ 4650.769912] ---[ end trace 4488bf4278af9827 ]--- ProblemType: Bug DistroRelease: Ubuntu 18.04 Package: linux-image-4.15.0-48-generic 4.15.0-48.51 ProcVersionSignature: Ubuntu 4.15.0-48.51-generic 4.15.18 Uname: Linux 4.15.0-48-generic x86_64 ApportVersion: 2.20.9-0ubuntu7.6 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: ken 2604 F.... pulseaudio /dev/snd/controlC1: ken 2604 F.... pulseaudio CurrentDesktop: ubuntu:GNOME Date: Sun May 5 18:18:41 2019 HibernationDevice: RESUME=UUID=d9769aee-0f6e-4d98-8376-a6ba3aa6edf8 InstallationDate: Installed on 2018-10-18 (199 days ago) InstallationMedia: Ubuntu-Server 18.04.1 LTS "Bionic Beaver" - Release amd64 (20180725) IwConfig: lo no wireless extensions. enp2s0 no wireless extensions. MachineType: Gigabyte Technology Co., Ltd. H87M-D3H 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=/boot/vmlinuz-4.15.0-48-generic root=/dev/mapper/system-Ubuntu--18.04.1 ro RelatedPackageVersions: linux-restricted-modules-4.15.0-48-generic N/A linux-backports-modules-4.15.0-48-generic N/A linux-firmware 1.173.5 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/24/2013 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F3 dmi.board.asset.tag: To be filled by O.E.M. dmi.board.name: H87M-D3H dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF3:bd04/24/2013:svnGigabyteTechnologyCo.,Ltd.:pnH87M-D3H:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH87M-D3H:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.: dmi.product.family: To be filled by O.E.M. dmi.product.name: H87M-D3H dmi.product.version: To be filled by O.E.M. dmi.sys.vendor: Gigabyte Technology Co., Ltd. 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