Issue still remains with the mainline kernel. The contents of the kernel Oops message differs slightly, but still very similar:
[ 27.532858] BUG: unable to handle kernel NULL pointer dereference at 00000000000003e8 [ 27.532862] #PF error: [WRITE] [ 27.532865] PGD 0 P4D 0 [ 27.532869] Oops: 0002 [#1] SMP NOPTI [ 27.532873] CPU: 3 PID: 82 Comm: kworker/3:1 Not tainted 5.1.0-050100rc3-generic #201904010618 [ 27.532875] Hardware name: HP HP EliteBook 755 G5/83D5, BIOS Q81 Ver. 01.04.01 09/13/2018 [ 27.532982] Workqueue: events dm_irq_work_func [amdgpu] [ 27.532989] RIP: 0010:queue_work_on+0x1b/0x40 [ 27.532992] Code: 75 01 01 e8 f9 13 fe ff 0f 0b e9 b5 fc ff ff 0f 1f 44 00 00 55 48 89 e5 53 9c 58 0f 1f 44 00 00 48 89 c3 fa 66 0f 1f 44 00 00 <f0> 48 0f ba 2a 00 73 11 31 c9 48 89 df 57 9d 0f 1f 44 00 00 89 c8 [ 27.532994] RSP: 0018:ffffc16bc1eebc88 EFLAGS: 00010002 [ 27.532996] RAX: 0000000000000202 RBX: 0000000000000202 RCX: 0000000000000001 [ 27.532998] RDX: 00000000000003e8 RSI: ffff9dde1e80d200 RDI: 0000000000002000 [ 27.533000] RBP: ffffc16bc1eebc90 R08: 0000000000027080 R09: ffffffffb8210b0b [ 27.533002] R10: fffffc35106d5500 R11: ffff9dde1e86ca90 R12: ffff9dde0f2db646 [ 27.533003] R13: ffff9dde1b4b9a80 R14: ffff9dde195eb000 R15: 0000000000000000 [ 27.533006] FS: 0000000000000000(0000) GS:ffff9dde1ecc0000(0000) knlGS:0000000000000000 [ 27.533008] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [ 27.533010] CR2: 00000000000003e8 CR3: 0000000411ca6000 CR4: 00000000003406a0 [ 27.533011] Call Trace: [ 27.533026] drm_dp_mst_handle_up_req+0x503/0x550 [drm_kms_helper] [ 27.533037] drm_dp_mst_hpd_irq+0xbe/0xaa0 [drm_kms_helper] [ 27.533045] ? drm_dp_mst_hpd_irq+0xbe/0xaa0 [drm_kms_helper] [ 27.533133] handle_hpd_rx_irq+0x22c/0x2e0 [amdgpu] [ 27.533219] ? handle_hpd_rx_irq+0x22c/0x2e0 [amdgpu] [ 27.533306] dm_irq_work_func+0x53/0x70 [amdgpu] [ 27.533309] process_one_work+0x20f/0x410 [ 27.533312] worker_thread+0x34/0x400 [ 27.533315] kthread+0x120/0x140 [ 27.533318] ? process_one_work+0x410/0x410 [ 27.533320] ? __kthread_parkme+0x70/0x70 [ 27.533325] ret_from_fork+0x22/0x40 [ 27.533327] Modules linked in: cmac bnep btusb btrtl btbcm btintel bluetooth ecdh_generic bonding uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev media nfc edac_mce_amd kvm_amd ccp kvm arc4 irqbypass nls_iso8859_1 crct10dif_pclmul crc32_pclmul snd_hda_codec_conexant ghash_clmulni_intel snd_hda_codec_generic snd_hda_codec_hdmi ledtrig_audio snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm aesni_intel iwlmvm snd_seq_midi snd_seq_midi_event aes_x86_64 crypto_simd mac80211 cryptd snd_rawmidi glue_helper snd_seq iwlwifi snd_seq_device joydev snd_timer input_leds hp_wmi serio_raw sparse_keymap wmi_bmof snd k10temp cfg80211 soundcore ipmi_devintf ipmi_msghandler ucsi_acpi typec_ucsi typec hp_wireless mac_hid sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 amdgpu chash gpu_sched amd_iommu_v2 i2c_algo_bit ttm drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops nvme psmouse ahci drm libahci i2c_piix4 r8169 nvme_core realtek [ 27.533372] wmi i2c_hid hid video [ 27.533378] CR2: 00000000000003e8 [ 27.533380] ---[ end trace af80d2e3030b9f18 ]--- ** 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/1819924 Title: System hangs when hot-plugging dual monitor dock Status in linux package in Ubuntu: Confirmed Bug description: When plugging in my Cable Matters USB-C Dual 4K DisplayPort Docking Station into my system, after it has already booted, the system hangs with a kernel OOPS. This is always repeatable. Steps to reproduce: 1. Ensure docking station is unplugged or shut-off. 2. Boot up computer. 3. Turn-on docking station and plug into to system. If the docking station is plugged in before the system boots, it works fine. It can even be unpluged and hot-plugged without issue at that point. This kernel Oops occurs when the system hangs: BUG: unable to handle kernel NULL pointer dereference at 0000000000000320 PGD 0 P4D 0 SMP NOPTI CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G D OE 4.18.0-16-generic #17-Ubuntu Hardware name: HP HP EliteBook 755 G5/83D5, BIOS Q81 Ver. 01.04.01 09/13/2018 Workqueue: events_long drm_dp_mst_link_probe_work [drm_kms_helper] RIP: 0010:mutex_lock+0x1d/0x30 Code: 5d c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 53 48 89 fb e8 8e df ff ff 31 c0 65 48 8b 14 25 00 5c 01 00 <f0> 48 0f b1 13 74 08 48 89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44 RSP: 0018:ffffb6c0c1efbd78 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000320 RCX: ffff8ed7cfb5c800 RDX: ffff8ed7d3830000 RSI: 0000000000000202 RDI: 0000000000000320 RBP: ffffb6c0c1efbd80 R08: 0000000000000201 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8ed7df6e1ac8 R12: 0000000000000000 R13: ffff8ed7cfb5c468 R14: ffff8ed7d3b33f60 R15: 0000000000000000 FS: 0000000000000000(0000) GS:ffff8ed7df6c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000320 CR3: 00000003b5d6e000 CR4: 00000000003406a0 Call Trace: drm_dp_mst_wait_tx_reply+0x155/0x1f0 [drm_kms_helper] ? wait_woken+0x80/0x80 drm_dp_send_enum_path_resources.isra.24+0x69/0xf0 [drm_kms_helper] drm_dp_check_and_send_link_address+0xa1/0xd0 [drm_kms_helper] drm_dp_mst_link_probe_work+0x4f/0x80 [drm_kms_helper] process_one_work+0x20f/0x410 worker_thread+0x34/0x400 kthread+0x120/0x140 ? pwq_unbound_release_workfn+0xd0/0xd0 ? kthread_bind+0x40/0x40 ret_from_fork+0x22/0x40 Modules linked in: snd_usb_audio snd_usbmidi_lib usbhid cdc_ether uas usbnet usb_storage r8152 rfcomm binfmt_misc ccm cmac bnep btusb btrtl btbcm btintel bluetooth ecdh_generic uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev media evdi(OE) nfc arc4 joydev nls_iso8859_1 snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec edac_mce_amd snd_hda_core snd_hwdep kvm_amd ccp kvm irqbypass snd_pcm crct10dif_pclmul iwlmvm crc32_pclmul ghash_clmulni_intel pcbc snd_seq_midi snd_seq_midi_event mac80211 snd_rawmidi snd_seq snd_seq_device snd_timer iwlwifi aesni_intel snd hp_wmi aes_x86_64 crypto_simd cryptd input_leds glue_helper wmi_bmof serio_raw sparse_keymap hid_multitouch k10temp soundcore cfg80211 ipmi_devintf ipmi_msghandler ucsi_acpi typec_ucsi typec mac_hid hp_wireless sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic amdkfd amd_iommu_v2 amdgpu chash gpu_sched i2c_algo_bit ttm nvme drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse drm ahci libahci r8169 nvme_core i2c_piix4 mii i2c_hid wmi hid video CR2: 0000000000000320 ---[ end trace 3aa69f7fb354f0c1 ]--- BUG: unable to handle kernel NULL pointer dereference at 0000000000000320 PGD 0 P4D 0 RIP: 0010:queue_work_on+0x1b/0x40 Code: SMP NOPTI CPU: 0 PID: 974 Comm: Xorg Tainted: G D OE 4.18.0-16-generic #17-Ubuntu Hardware name: HP HP EliteBook 755 G5/83D5, BIOS Q81 Ver. 01.04.01 09/13/2018 RIP: 0010:mutex_lock+0x1d/0x30 Code: 5d c3 58 66 66 2e 0f 01 01 e8 69 1f 84 00 27 fe ff 00 0f 0b e9 00 b5 fc ff 00 ff 0f 1f 00 44 00 00 0f 55 48 89 e5 1f 44 00 53 00 55 48 9c 89 e5 53 58 0f 1f 48 44 00 00 48 89 fb e8 89 c3 fa 8e 66 0f 1f df 44 00 00 <f0> ff 48 0f ba 2a ff 31 c0 00 65 48 8b 73 11 31 c9 14 25 00 48 89 df 57 5c 01 00 9d 0f 1f <f0> 44 00 00 89 48 0f b1 c8 RSP: 0018:ffffb6c0c2063c98 EFLAGS: 00010002 13 RAX: 0000000000000202 RBX: 0000000000000202 RCX: 0000000000000000 74 08 48 89 RDX: 00000000000003a8 RSI: ffff8ed7df019000 RDI: 0000000000002000 df e8 b4 RBP: ffffb6c0c2063ca0 R08: 0000000000027080 R09: ffffffffa25d9e13 R10: fffffa628ed74840 R11: 0000000000000036 R12: ffff8ed7cfb5c5e6 R13: ffff8ed7801fa800 R14: 0000000000000001 R15: ffff8ed7d3b33f60 FS: 0000000000000000(0000) GS:ffff8ed7df6c0000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000320 CR3: 00000003b5d6e000 CR4: 00000000003406a0 ff ff ff 5b 5d c3 90 0f 1f 44 RSP: 0018:ffffb6c0c2b3b858 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000320 RCX: ffff8ed7cfb5c800 RDX: ffff8ed7da888000 RSI: 0000000000000206 RDI: 0000000000000320 RBP: ffffb6c0c2b3b860 R08: 0000000000000206 R09: 0000000000000000 R10: 0000000000000000 R11: ffff8ed7df621ac8 R12: 0000000000000000 R13: ffff8ed7cfb5c468 R14: ffff8ed7d3b33f60 R15: 0000000000000000 FS: 00007f9cc3b65a80(0000) GS:ffff8ed7df600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000320 CR3: 000000041a814000 CR4: 00000000003406b0 Call Trace: drm_dp_mst_wait_tx_reply+0x155/0x1f0 [drm_kms_helper] ? wait_woken+0x80/0x80 drm_dp_mst_i2c_xfer+0x1b8/0x270 [drm_kms_helper] __i2c_transfer+0x119/0x410 ? _cond_resched+0x19/0x30 i2c_transfer+0x5a/0xd0 drm_do_probe_ddc_edid+0xbe/0x140 [drm] drm_get_edid+0x51/0x390 [drm] ? _cond_resched+0x19/0x30 drm_dp_mst_get_edid+0x6f/0x90 [drm_kms_helper] dm_dp_mst_get_modes+0x8a/0x140 [amdgpu] ? drm_helper_probe_detect+0x78/0xa0 [drm_kms_helper] drm_helper_probe_single_connector_modes+0x18b/0x700 [drm_kms_helper] drm_mode_getconnector+0x40e/0x440 [drm] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm] drm_ioctl_kernel+0xa4/0xf0 [drm] drm_ioctl+0x227/0x400 [drm] ? drm_mode_connector_property_set_ioctl+0x60/0x60 [drm] amdgpu_drm_ioctl+0x4f/0x90 [amdgpu] do_vfs_ioctl+0xa8/0x620 ksys_ioctl+0x67/0x90 __x64_sys_ioctl+0x1a/0x20 do_syscall_64+0x5a/0x110 entry_SYSCALL_64_after_hwframe+0x44/0xa9 RIP: 0033:0x7f9cc4e9c3c7 Code: 00 00 90 48 8b 05 c9 3a 0d 00 64 c7 00 26 00 00 00 48 c7 c0 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d 99 3a 0d 00 f7 d8 64 89 01 48 RSP: 002b:00007ffecec1ff28 EFLAGS: 00003246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00005601df01d790 RCX: 00007f9cc4e9c3c7 RDX: 00007ffecec1ff60 RSI: 00000000c05064a7 RDI: 000000000000000d RBP: 00007ffecec1ff60 R08: 00005601df01b0a0 R09: 0000000000000001 R10: 0000000000000000 R11: 0000000000003246 R12: 00000000c05064a7 R13: 000000000000000d R14: 000000000000000d R15: 00007ffecec1ff60 Modules linked in: snd_usb_audio snd_usbmidi_lib usbhid cdc_ether uas usbnet usb_storage r8152 rfcomm binfmt_misc ccm cmac bnep btusb btrtl btbcm btintel bluetooth ecdh_generic uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 videobuf2_common videodev media evdi(OE) nfc arc4 joydev nls_iso8859_1 snd_hda_codec_conexant snd_hda_codec_generic snd_hda_codec_hdmi snd_hda_intel snd_hda_codec edac_mce_amd snd_hda_core snd_hwdep kvm_amd ccp kvm irqbypass snd_pcm crct10dif_pclmul iwlmvm crc32_pclmul ghash_clmulni_intel pcbc snd_seq_midi snd_seq_midi_event mac80211 snd_rawmidi snd_seq snd_seq_device snd_timer iwlwifi aesni_intel snd hp_wmi aes_x86_64 crypto_simd cryptd input_leds glue_helper wmi_bmof serio_raw sparse_keymap hid_multitouch k10temp soundcore cfg80211 ipmi_devintf ipmi_msghandler ucsi_acpi typec_ucsi typec mac_hid hp_wireless sch_fq_codel parport_pc ppdev lp parport ip_tables x_tables autofs4 hid_generic amdkfd amd_iommu_v2 amdgpu chash gpu_sched i2c_algo_bit ttm nvme drm_kms_helper syscopyarea sysfillrect sysimgblt fb_sys_fops psmouse drm ahci libahci r8169 nvme_core i2c_piix4 mii i2c_hid wmi hid video CR2: 0000000000000320 ---[ end trace 3aa69f7fb354f0c2 ]--- RIP: 0010:queue_work_on+0x1b/0x40 Code: 58 01 01 e8 69 27 fe ff 0f 0b e9 b5 fc ff ff 0f 1f 44 00 00 55 48 89 e5 53 9c 58 0f 1f 44 00 00 48 89 c3 fa 66 0f 1f 44 00 00 <f0> 48 0f ba 2a 00 73 11 31 c9 48 89 df 57 9d 0f 1f 44 00 00 89 c8 RSP: 0018:ffffb6c0c2063c98 EFLAGS: 00010002 RAX: 0000000000000202 RBX: 0000000000000202 RCX: 0000000000000000 RDX: 00000000000003a8 RSI: ffff8ed7df019000 RDI: 0000000000002000 RBP: ffffb6c0c2063ca0 R08: 0000000000027080 R09: ffffffffa25d9e13 R10: fffffa628ed74840 R11: 0000000000000036 R12: ffff8ed7cfb5c5e6 R13: ffff8ed7801fa800 R14: 0000000000000001 R15: ffff8ed7d3b33f60 FS: 00007f9cc3b65a80(0000) GS:ffff8ed7df600000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000320 CR3: 000000041a814000 CR4: 00000000003406b0 This issue appears to be related to bug 107738, found upstream in the drm kernel module (https://bugs.freedesktop.org/show_bug.cgi?id=107738). However, the fix for that bug appears to have already been committed downstream, however this bug is still occurring for me. ProblemType: Bug DistroRelease: Ubuntu 18.10 Package: linux-image-4.18.0-16-generic 4.18.0-16.17 ProcVersionSignature: Ubuntu 4.18.0-16.17-generic 4.18.20 Uname: Linux 4.18.0-16-generic x86_64 ApportVersion: 2.20.10-0ubuntu13 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC2: bernie 2029 F.... pulseaudio /dev/snd/controlC1: bernie 2029 F.... pulseaudio /dev/snd/controlC0: bernie 2029 F.... pulseaudio CurrentDesktop: KDE Date: Wed Mar 13 10:21:30 2019 InstallationDate: Installed on 2019-03-10 (3 days ago) InstallationMedia: Kubuntu 18.10 "Cosmic Cuttlefish" - Release amd64 (20181017.2) MachineType: HP HP EliteBook 755 G5 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.18.0-16-generic root=UUID=b1aeec1e-bc30-4b40-a818-f9bf0e603915 ro mce=off iommu=soft quiet splash vt.handoff=1 RelatedPackageVersions: linux-restricted-modules-4.18.0-16-generic N/A linux-backports-modules-4.18.0-16-generic N/A linux-firmware 1.175 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/13/2018 dmi.bios.vendor: HP dmi.bios.version: Q81 Ver. 01.04.01 dmi.board.name: 83D5 dmi.board.vendor: HP dmi.board.version: KBC Version 08.47.00 dmi.chassis.asset.tag: 5CG9082GFP dmi.chassis.type: 10 dmi.chassis.vendor: HP dmi.modalias: dmi:bvnHP:bvrQ81Ver.01.04.01:bd09/13/2018:svnHP:pnHPEliteBook755G5:pvr:rvnHP:rn83D5:rvrKBCVersion08.47.00:cvnHP:ct10:cvr: dmi.product.family: 103C_5336AN HP EliteBook dmi.product.name: HP EliteBook 755 G5 dmi.product.sku: 4HZ53UT#ABA dmi.sys.vendor: HP To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1819924/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
