Status changed to 'Confirmed' because the bug affects multiple users.

** Changed in: linux-oem-5.6 (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1919425

Title:
  System freeze

Status in linux-oem-5.6 package in Ubuntu:
  Confirmed

Bug description:
  I've been getting freezes on Ubuntu 20.04 on my Dell Latitude 7420
  laptop with a secondary display connected through a WD19 Dell dock.
  I'm on the supposedly-certified 5.6.0-1048-oem kernel, have tried 5.8
  and 5.10 without much success (other types of freezes). Some freezes
  lock up the machine hard with no way to ssh in or check anything and
  no logs. The one below I was able to ssh in and dump dmesg, rebooting
  via ssh froze and I had to do a hard reboot.

  [ 7557.306199] BUG: unable to handle page fault for address: ffff8ceca8900758
  [ 7557.306206] #PF: supervisor write access in kernel mode
  [ 7557.306209] #PF: error_code(0x0002) - not-present page
  [ 7557.306211] PGD 39601067 P4D 39601067 PUD 0
  [ 7557.306217] Oops: 0002 [#1] SMP NOPTI
  [ 7557.306221] CPU: 4 PID: 6181 Comm: chrome Tainted: G        W  O      
5.6.0-1048-oem #52-Ubuntu
  [ 7557.306223] Hardware name: Dell Inc. Latitude 7420/095TWY, BIOS 1.3.5 
01/18/2021
  [ 7557.306231] RIP: 0010:remove_wait_queue+0x25/0x50
  [ 7557.306235] Code: 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 49 89 fc 
53 48 89 f3 e8 f9 e2 a1 00 48 8b 53 18 4c 89 e7 48 89 c6 48 8b 43 20 <48> 89 42 
08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 43 18 48
  [ 7557.306237] RSP: 0018:ffffb14e015cba78 EFLAGS: 00010046
  [ 7557.306240] RAX: ffff8caca8900750 RBX: ffffb14e015cbc80 RCX: 
0000000000000001
  [ 7557.306242] RDX: ffff8ceca8900750 RSI: 0000000000000282 RDI: 
ffff8caca8900748
  [ 7557.306244] RBP: ffffb14e015cba88 R08: ffff8cac52a2c000 R09: 
0000000000000003
  [ 7557.306245] R10: 0000000000000084 R11: fffffffffffb159a R12: 
ffff8caca8900748
  [ 7557.306247] R13: 0000000000000000 R14: ffffb14e015cbc70 R15: 
0000000000000001
  [ 7557.306250] FS:  00007f137ff04d80(0000) GS:ffff8cacaf700000(0000) 
knlGS:0000000000000000
  [ 7557.306252] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 7557.306254] CR2: ffff8ceca8900758 CR3: 00000007ee554005 CR4: 
0000000000760ee0
  [ 7557.306255] PKRU: 55555554
  [ 7557.306257] Call Trace:
  [ 7557.306265]  poll_freewait+0x42/0xa0
  [ 7557.306268]  do_sys_poll+0x480/0x520
  [ 7557.306275]  ? poll_select_finish+0x210/0x210
  [ 7557.306278]  ? poll_select_finish+0x210/0x210
  [ 7557.306282]  ? poll_select_finish+0x210/0x210
  [ 7557.306284]  ? poll_select_finish+0x210/0x210
  [ 7557.306287]  ? poll_select_finish+0x210/0x210
  [ 7557.306292]  ? fput+0x13/0x15
  [ 7557.306296]  ? __sys_sendto+0x153/0x190
  [ 7557.306300]  ? __fget_light+0x62/0x80
  [ 7557.306303]  ? fput+0x13/0x15
  [ 7557.306306]  ? __sys_recvmsg+0x88/0xa0
  [ 7557.306310]  ? ktime_get_ts64+0x4c/0xe0
  [ 7557.306313]  __x64_sys_poll+0xa5/0x140
  [ 7557.306319]  do_syscall_64+0x57/0x1b0
  [ 7557.306324]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [ 7557.306328] RIP: 0033:0x7f1381360aff
  [ 7557.306330] Code: 54 24 1c 48 89 74 24 10 48 89 7c 24 08 e8 79 1c f8 ff 8b 
54 24 1c 48 8b 74 24 10 41 89 c0 48 8b 7c 24 08 b8 07 00 00 00 0f 05 <48> 3d 00 
f0 ff ff 77 2b 44 89 c7 89 44 24 08 e8 ad 1c f8 ff 8b 44
  [ 7557.306332] RSP: 002b:00007fff0cd693d0 EFLAGS: 00000293 ORIG_RAX: 
0000000000000007
  [ 7557.306335] RAX: ffffffffffffffda RBX: 00007f13828e60d0 RCX: 
00007f1381360aff
  [ 7557.306336] RDX: 0000000000000ea1 RSI: 0000000000000005 RDI: 
0000377ea82ca210
  [ 7557.306338] RBP: 0000377ea82ca210 R08: 0000000000000000 R09: 
0000000000000001
  [ 7557.306339] R10: 0000377ea8b40460 R11: 0000000000000293 R12: 
0000000000000005
  [ 7557.306341] R13: 00007fff0cd69414 R14: 0000000000000ea1 R15: 
0000377ea6d9bd10
  [ 7557.306346] Modules linked in: rfcomm vboxnetadp(O) vboxnetflt(O) 
vboxdrv(O) ccm typec_displayport cmac algif_hash algif_skcipher af_alg bnep 
binfmt_misc nls_iso8859_1 snd_hda_codec_hdmi snd_sof_pci 
snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_xtensa_dsp snd_sof_intel_hda 
snd_sof snd_hda_ext_core snd_soc_acpi_intel_match snd_hda_codec_realtek 
snd_hda_codec_generic snd_soc_acpi dell_laptop mei_hdcp intel_rapl_msr 
ledtrig_audio snd_hda_intel snd_intel_dspcfg x86_pkg_temp_thermal 
intel_powerclamp soundwire_intel soundwire_generic_allocation coretemp 
soundwire_cadence snd_hda_codec kvm_intel kvm snd_hda_core soundwire_bus 
dell_wmi intel_cstate snd_soc_core snd_compress dell_smbios ac97_bus serio_raw 
snd_pcm_dmaengine dcdbas snd_usb_audio dell_wmi_descriptor snd_usbmidi_lib 
snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event wmi_bmof uvcvideo snd_rawmidi 
videobuf2_vmalloc snd_seq videobuf2_memops snd_seq_device snd_timer 
videobuf2_v4l2 joydev btusb cdc_ether snd input_leds videobuf2_common
  [ 7557.306386]  btrtl usbnet soundcore btbcm iwlmvm videodev btintel mac80211 
r8152 mc libarc4 mii bluetooth ecdh_generic ecc iwlwifi hid_sensor_accel_3d 
hid_sensor_gyro_3d hid_sensor_als hid_sensor_trigger cfg80211 
industrialio_triggered_buffer kfifo_buf mei_me hid_sensor_iio_common 
industrialio ucsi_acpi mei hid_multitouch processor_thermal_device 
intel_rapl_common cros_ec_ishtp typec_ucsi cros_ec intel_soc_dts_iosf typec 
soc_button_array int3403_thermal int340x_thermal_zone mac_hid int3400_thermal 
acpi_tad acpi_thermal_rel acpi_pad intel_hid sparse_keymap sch_fq_codel 
parport_pc ppdev lp parport ip_tables x_tables autofs4 dm_crypt 
hid_logitech_hidpp hid_logitech_dj usbhid hid_sensor_custom hid_sensor_hub 
hid_generic intel_ishtp_loader intel_ishtp_hid rtsx_pci_sdmmc i915 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit drm_kms_helper 
aesni_intel syscopyarea sysfillrect crypto_simd sysimgblt cryptd fb_sys_fops 
glue_helper psmouse ahci i2c_i801 rtsx_pci cec libahci rc_core
  [ 7557.306426]  intel_lpss_pci intel_lpss drm thunderbolt nvme idma64 
intel_ish_ipc virt_dma nvme_core intel_ishtp wmi i2c_hid hid video 
pinctrl_tigerlake pinctrl_intel
  [ 7557.306439] CR2: ffff8ceca8900758
  [ 7557.306442] ---[ end trace 66be81a329a3fc59 ]---
  [ 7557.306446] RIP: 0010:remove_wait_queue+0x25/0x50
  [ 7557.306448] Code: 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 49 89 fc 
53 48 89 f3 e8 f9 e2 a1 00 48 8b 53 18 4c 89 e7 48 89 c6 48 8b 43 20 <48> 89 42 
08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 43 18 48
  [ 7557.306450] RSP: 0018:ffffb14e015cba78 EFLAGS: 00010046
  [ 7557.306452] RAX: ffff8caca8900750 RBX: ffffb14e015cbc80 RCX: 
0000000000000001
  [ 7557.306454] RDX: ffff8ceca8900750 RSI: 0000000000000282 RDI: 
ffff8caca8900748
  [ 7557.306455] RBP: ffffb14e015cba88 R08: ffff8cac52a2c000 R09: 
0000000000000003
  [ 7557.306457] R10: 0000000000000084 R11: fffffffffffb159a R12: 
ffff8caca8900748
  [ 7557.306459] R13: 0000000000000000 R14: ffffb14e015cbc70 R15: 
0000000000000001
  [ 7557.306461] FS:  00007f137ff04d80(0000) GS:ffff8cacaf700000(0000) 
knlGS:0000000000000000
  [ 7557.306463] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 7557.306465] CR2: ffff8ceca8900758 CR3: 00000007ee554005 CR4: 
0000000000760ee0
  [ 7557.306466] PKRU: 55555554
  [ 7570.600849] BUG: unable to handle page fault for address: ffffb14e015cbd18
  [ 7570.600854] #PF: supervisor read access in kernel mode
  [ 7570.600856] #PF: error_code(0x0000) - not-present page
  [ 7570.600858] PGD 86c02c067 P4D 86c02c067 PUD 86c02d067 PMD 859525067 PTE 0
  [ 7570.600863] Oops: 0000 [#2] SMP NOPTI
  [ 7570.600867] CPU: 7 PID: 2417 Comm: Xorg Tainted: G      D W  O      
5.6.0-1048-oem #52-Ubuntu
  [ 7570.600869] Hardware name: Dell Inc. Latitude 7420/095TWY, BIOS 1.3.5 
01/18/2021
  [ 7570.600877] RIP: 0010:__wake_up_common+0x55/0x140
  [ 7570.600881] Code: 41 f6 01 04 0f 85 a2 00 00 00 48 8b 43 08 48 8d 78 e8 48 
8d 43 08 48 89 45 d0 48 89 c1 48 8d 47 18 48 39 c1 0f 84 b7 00 00 00 <48> 8b 47 
18 89 55 c8 45 31 e4 48 8d 58 e8 44 8b 2f 41 f6 c5 04 75
  [ 7570.600883] RSP: 0018:ffffb14e02ea7b48 EFLAGS: 00010083
  [ 7570.600886] RAX: ffffb14e015cbd18 RBX: ffff8cac575dadc0 RCX: 
ffff8cac575dadc8
  [ 7570.600888] RDX: 0000000000000001 RSI: 0000000000000001 RDI: 
ffffb14e015cbd00
  [ 7570.600889] RBP: ffffb14e02ea7b88 R08: 00000000000000c3 R09: 
ffffb14e02ea7ba0
  [ 7570.600891] R10: ffff8cac595bb800 R11: 0000000040000000 R12: 
0000000000000001
  [ 7570.600893] R13: 0000000000000246 R14: 0000000000000001 R15: 
00000000000000c3
  [ 7570.600895] FS:  00007f394b3a7a40(0000) GS:ffff8cacaf7c0000(0000) 
knlGS:0000000000000000
  [ 7570.600897] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 7570.600899] CR2: ffffb14e015cbd18 CR3: 0000000818bd8006 CR4: 
0000000000760ee0
  [ 7570.600901] PKRU: 55555554
  [ 7570.600902] Call Trace:
  [ 7570.600909]  __wake_up_common_lock+0x7c/0xc0
  [ 7570.600914]  __wake_up_sync_key+0x20/0x30
  [ 7570.600919]  sock_def_readable+0x3b/0x70
  [ 7570.600924]  unix_stream_sendmsg+0x148/0x410
  [ 7570.600930]  sock_sendmsg+0x65/0x70
  [ 7570.600933]  sock_write_iter+0x93/0xf0
  [ 7570.600939]  do_iter_readv_writev+0x14f/0x1d0
  [ 7570.600942]  do_iter_write+0x84/0x1a0
  [ 7570.600946]  vfs_writev+0xa6/0xf0
  [ 7570.600950]  ? vfs_read+0x12e/0x160
  [ 7570.600953]  do_writev+0xe5/0x120
  [ 7570.600956]  ? ksys_read+0xce/0xe0
  [ 7570.600960]  __x64_sys_writev+0x1c/0x20
  [ 7570.600964]  do_syscall_64+0x57/0x1b0
  [ 7570.600970]  entry_SYSCALL_64_after_hwframe+0x44/0xa9
  [ 7570.600973] RIP: 0033:0x7f394b70761d
  [ 7570.600975] Code: 28 89 54 24 1c 48 89 74 24 10 89 7c 24 08 e8 5a 01 f8 ff 
8b 54 24 1c 48 8b 74 24 10 41 89 c0 8b 7c 24 08 b8 14 00 00 00 0f 05 <48> 3d 00 
f0 ff ff 77 2f 44 89 c7 48 89 44 24 08 e8 8e 01 f8 ff 48
  [ 7570.600977] RSP: 002b:00007ffe4b88bdc0 EFLAGS: 00000293 ORIG_RAX: 
0000000000000014
  [ 7570.600980] RAX: ffffffffffffffda RBX: 00005610b42cf770 RCX: 
00007f394b70761d
  [ 7570.600981] RDX: 0000000000000001 RSI: 00007ffe4b88c0b0 RDI: 
000000000000001f
  [ 7570.600983] RBP: 0000000000000000 R08: 0000000000000000 R09: 
0000000000000001
  [ 7570.600984] R10: 0000000000000000 R11: 0000000000000293 R12: 
0000000000000001
  [ 7570.600986] R13: 00007ffe4b88c0b0 R14: 0000000000000000 R15: 
00007f394b3a76c0
  [ 7570.600991] Modules linked in: rfcomm vboxnetadp(O) vboxnetflt(O) 
vboxdrv(O) ccm typec_displayport cmac algif_hash algif_skcipher af_alg bnep 
binfmt_misc nls_iso8859_1 snd_hda_codec_hdmi snd_sof_pci 
snd_sof_intel_hda_common snd_soc_hdac_hda snd_sof_xtensa_dsp snd_sof_intel_hda 
snd_sof snd_hda_ext_core snd_soc_acpi_intel_match snd_hda_codec_realtek 
snd_hda_codec_generic snd_soc_acpi dell_laptop mei_hdcp intel_rapl_msr 
ledtrig_audio snd_hda_intel snd_intel_dspcfg x86_pkg_temp_thermal 
intel_powerclamp soundwire_intel soundwire_generic_allocation coretemp 
soundwire_cadence snd_hda_codec kvm_intel kvm snd_hda_core soundwire_bus 
dell_wmi intel_cstate snd_soc_core snd_compress dell_smbios ac97_bus serio_raw 
snd_pcm_dmaengine dcdbas snd_usb_audio dell_wmi_descriptor snd_usbmidi_lib 
snd_hwdep snd_pcm snd_seq_midi snd_seq_midi_event wmi_bmof uvcvideo snd_rawmidi 
videobuf2_vmalloc snd_seq videobuf2_memops snd_seq_device snd_timer 
videobuf2_v4l2 joydev btusb cdc_ether snd input_leds videobuf2_common
  [ 7570.601029]  btrtl usbnet soundcore btbcm iwlmvm videodev btintel mac80211 
r8152 mc libarc4 mii bluetooth ecdh_generic ecc iwlwifi hid_sensor_accel_3d 
hid_sensor_gyro_3d hid_sensor_als hid_sensor_trigger cfg80211 
industrialio_triggered_buffer kfifo_buf mei_me hid_sensor_iio_common 
industrialio ucsi_acpi mei hid_multitouch processor_thermal_device 
intel_rapl_common cros_ec_ishtp typec_ucsi cros_ec intel_soc_dts_iosf typec 
soc_button_array int3403_thermal int340x_thermal_zone mac_hid int3400_thermal 
acpi_tad acpi_thermal_rel acpi_pad intel_hid sparse_keymap sch_fq_codel 
parport_pc ppdev lp parport ip_tables x_tables autofs4 dm_crypt 
hid_logitech_hidpp hid_logitech_dj usbhid hid_sensor_custom hid_sensor_hub 
hid_generic intel_ishtp_loader intel_ishtp_hid rtsx_pci_sdmmc i915 
crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit drm_kms_helper 
aesni_intel syscopyarea sysfillrect crypto_simd sysimgblt cryptd fb_sys_fops 
glue_helper psmouse ahci i2c_i801 rtsx_pci cec libahci rc_core
  [ 7570.601068]  intel_lpss_pci intel_lpss drm thunderbolt nvme idma64 
intel_ish_ipc virt_dma nvme_core intel_ishtp wmi i2c_hid hid video 
pinctrl_tigerlake pinctrl_intel
  [ 7570.601081] CR2: ffffb14e015cbd18
  [ 7570.601084] ---[ end trace 66be81a329a3fc5a ]---
  [ 7570.601088] RIP: 0010:remove_wait_queue+0x25/0x50
  [ 7570.601090] Code: 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 54 49 89 fc 
53 48 89 f3 e8 f9 e2 a1 00 48 8b 53 18 4c 89 e7 48 89 c6 48 8b 43 20 <48> 89 42 
08 48 89 10 48 b8 00 01 00 00 00 00 ad de 48 89 43 18 48
  [ 7570.601092] RSP: 0018:ffffb14e015cba78 EFLAGS: 00010046
  [ 7570.601094] RAX: ffff8caca8900750 RBX: ffffb14e015cbc80 RCX: 
0000000000000001
  [ 7570.601095] RDX: ffff8ceca8900750 RSI: 0000000000000282 RDI: 
ffff8caca8900748
  [ 7570.601097] RBP: ffffb14e015cba88 R08: ffff8cac52a2c000 R09: 
0000000000000003
  [ 7570.601099] R10: 0000000000000084 R11: fffffffffffb159a R12: 
ffff8caca8900748
  [ 7570.601100] R13: 0000000000000000 R14: ffffb14e015cbc70 R15: 
0000000000000001
  [ 7570.601103] FS:  00007f394b3a7a40(0000) GS:ffff8cacaf7c0000(0000) 
knlGS:0000000000000000
  [ 7570.601104] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [ 7570.601106] CR2: ffffb14e015cbd18 CR3: 0000000818bd8006 CR4: 
0000000000760ee0
  [ 7570.601108] PKRU: 55555554

  ProblemType: Bug
  DistroRelease: Ubuntu 20.04
  Package: xorg 1:7.7+19ubuntu14
  ProcVersionSignature: Ubuntu 5.6.0-1048.52-oem 5.6.19
  Uname: Linux 5.6.0-1048-oem x86_64
  ApportVersion: 2.20.11-0ubuntu27.16
  Architecture: amd64
  BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log'
  CasperMD5CheckResult: skip
  CompositorRunning: None
  CurrentDesktop: ubuntu:GNOME
  Date: Wed Mar 17 09:37:01 2021
  DistUpgraded: Fresh install
  DistroCodename: focal
  DistroVariant: ubuntu
  DkmsStatus: virtualbox, 6.1.16, 5.6.0-1048-oem, x86_64: installed
  GpuHangFrequency: Several times a week
  GpuHangReproducibility: Occurs more often under certain circumstances
  GpuHangStarted: Immediately after installing this version of Ubuntu
  GraphicsCard:
   Intel Corporation Device [8086:9a49] (rev 01) (prog-if 00 [VGA controller])
     Subsystem: Dell Device [1028:0a36]
  InstallationDate: Installed on 2021-02-27 (17 days ago)
  InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 
(20210209.1)
  MachineType: Dell Inc. Latitude 7420
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.6.0-1048-oem 
root=/dev/mapper/vgubuntu-root ro quiet splash vt.handoff=7
  SourcePackage: xorg
  Symptom: display
  Title: Xorg freeze
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/18/2021
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.3.5
  dmi.board.name: 095TWY
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 10
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.3.5:bd01/18/2021:svnDellInc.:pnLatitude7420:pvr:rvnDellInc.:rn095TWY:rvrA00:cvnDellInc.:ct10:cvr:
  dmi.product.family: Latitude
  dmi.product.name: Latitude 7420
  dmi.product.sku: 0A36
  dmi.sys.vendor: Dell Inc.
  version.compiz: compiz N/A
  version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1
  version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1
  version.libgl1-mesa-glx: libgl1-mesa-glx 20.2.6-0ubuntu0.20.04.1
  version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
2:2.99.917+git20200226-1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1

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