[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2020-09-02 Thread Launchpad Bug Tracker
[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
   Status: Incomplete => Expired

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1819924

Title:
  System hangs when hot-plugging dual monitor dock

Status in linux package in Ubuntu:
  Expired

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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 00

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2020-07-04 Thread Kai-Heng Feng
Please test latest mainline kernel:
https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.8-rc3/

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You received this bug notification because you are a member of Kernel
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https://bugs.launchpad.net/bugs/1819924

Title:
  System hangs when hot-plugging dual monitor dock

Status in linux package in Ubuntu:
  Incomplete

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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  (

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2020-06-09 Thread Bernie Bernstein
It had actually been working fine in 20.04 until a recent kernel update
to 5.4.0-33.37.

Since the update, it always fails with this stack trace:

[140594.217061] [ cut here ]
[140594.217062] sysfs group 'power' not found for kobject 'i2c-11'
[140594.217079] WARNING: CPU: 5 PID: 64631 at fs/sysfs/group.c:279 
sysfs_remove_group+0x7c/0x80
[140594.217080] Modules linked in: vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) 
binfmt_misc ccm rfcomm cmac algif_hash algif_skcipher af_alg cdc_ether usbnet 
r8152 mii snd_usb_audio snd_usbmidi_lib bnep bonding btusb btrtl btbcm btintel 
bluetooth ecdh_generic ecc evdi(OE) aufs uvcvideo videobuf2_vmalloc 
videobuf2_memops videobuf2_v4l2 videobuf2_common overlay nls_iso8859_1 
snd_hda_codec_conexant snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi 
snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm 
snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer 
snd iwlmvm edac_mce_amd mac80211 kvm_amd ccp soundcore libarc4 kvm iwlwifi 
input_leds joydev serio_raw hp_wmi sparse_keymap ipmi_devintf wmi_bmof 
hid_multitouch k10temp cfg80211 ipmi_msghandler ucsi_acpi typec_ucsi typec 
hp_wireless mac_hid sch_fq_codel v4l2loopback(OE) videodev mc parport_pc ppdev 
lp parport ip_tables x_tables autofs4 uas usb_storage raid10 raid456 
async_raid6_recov async_memcpy
[140594.217138]  async_pq async_xor async_tx xor usbhid raid6_pq libcrc32c 
raid1 raid0 multipath linear crct10dif_pclmul crc32_pclmul hid_generic 
ghash_clmulni_intel amdgpu amd_iommu_v2 gpu_sched i2c_algo_bit ttm nvme 
aesni_intel drm_kms_helper syscopyarea sysfillrect crypto_simd sysimgblt 
i2c_hid fb_sys_fops hid ahci psmouse drm cryptd libahci i2c_piix4 glue_helper 
nvme_core r8169 realtek wmi video i2c_amd_mp2_plat i2c_amd_mp2_pci
[140594.217167] CPU: 5 PID: 64631 Comm: kworker/5:0 Tainted: G   OE 
5.4.0-33-generic #37-Ubuntu
[140594.217169] Hardware name: HP HP EliteBook 755 G5/83D5, BIOS Q81 Ver. 
01.10.00 01/03/2020
[140594.217183] Workqueue: events drm_dp_destroy_connector_work [drm_kms_helper]
[140594.217187] RIP: 0010:sysfs_remove_group+0x7c/0x80
[140594.217191] Code: e7 e8 98 b9 ff ff 5b 41 5c 41 5d 5d c3 4c 89 e7 e8 e9 b4 
ff ff eb c9 49 8b 55 00 48 8b 33 48 c7 c7 40 d4 58 a5 e8 4f 90 d1 ff <0f> 0b eb 
d8 0f 1f 44 00 00 48 85 f6 74 37 55 48 89 e5 41 55 41 54
[140594.217192] RSP: 0018:b1ea82f3fc00 EFLAGS: 00010286
[140594.217194] RAX:  RBX: a52f3b60 RCX: 
0006
[140594.217196] RDX: 0007 RSI: 0096 RDI: 
9085dfd578c0
[140594.217197] RBP: b1ea82f3fc18 R08: 0851 R09: 
0004
[140594.217198] R10:  R11: 0001 R12: 

[140594.217199] R13: 9082e1c93800 R14: c0327140 R15: 
c0327140
[140594.217201] FS:  () GS:9085dfd4() 
knlGS:
[140594.217202] CS:  0010 DS:  ES:  CR0: 80050033
[140594.217204] CR2: 7f81ed808000 CR3: 00041687e000 CR4: 
003406a0
[140594.217205] Call Trace:
[140594.217213]  dpm_sysfs_remove+0x59/0x60
[140594.217217]  device_del+0x85/0x370
[140594.217220]  ? class_find_device+0x97/0xf0
[140594.217223]  device_unregister+0x1b/0x60
[140594.217226]  device_destroy+0x4b/0x70
[140594.217229]  i2cdev_detach_adapter+0x58/0x90
[140594.217231]  i2cdev_notifier_call+0x21/0x40
[140594.217235]  notifier_call_chain+0x55/0x80
[140594.217238]  blocking_notifier_call_chain+0x50/0x70
[140594.217241]  device_del+0x7d/0x370
[140594.217244]  device_unregister+0x1b/0x60
[140594.217247]  i2c_del_adapter+0x238/0x300
[140594.217257]  drm_dp_port_teardown_pdt+0x1f/0x40 [drm_kms_helper]
[140594.217267]  drm_dp_destroy_connector_work+0xa3/0x110 [drm_kms_helper]
[140594.217271]  process_one_work+0x1eb/0x3b0
[140594.217274]  worker_thread+0x4d/0x400
[140594.217277]  kthread+0x104/0x140
[140594.217279]  ? process_one_work+0x3b0/0x3b0
[140594.217281]  ? kthread_park+0x90/0x90
[140594.217285]  ret_from_fork+0x22/0x40
[140594.217288] ---[ end trace 854f992547f30c28 ]---
[140594.217339] [ cut here ]
[140594.217340] sysfs group 'power' not found for kobject 'i2c-11'
[140594.217352] WARNING: CPU: 5 PID: 64631 at fs/sysfs/group.c:279 
sysfs_remove_group+0x7c/0x80
[140594.217352] Modules linked in: vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) 
binfmt_misc ccm rfcomm cmac algif_hash algif_skcipher af_alg cdc_ether usbnet 
r8152 mii snd_usb_audio snd_usbmidi_lib bnep bonding btusb btrtl btbcm btintel 
bluetooth ecdh_generic ecc evdi(OE) aufs uvcvideo videobuf2_vmalloc 
videobuf2_memops videobuf2_v4l2 videobuf2_common overlay nls_iso8859_1 
snd_hda_codec_conexant snd_hda_codec_generic ledtrig_audio snd_hda_codec_hdmi 
snd_hda_intel snd_intel_dspcfg snd_hda_codec snd_hda_core snd_hwdep snd_pcm 
snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer 
snd iwlmvm edac_mce_amd mac80211 kvm_amd ccp 

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2020-06-08 Thread Kai-Heng Feng
Please test 20.04.

** Changed in: linux (Ubuntu)
   Status: Confirmed => Incomplete

-- 
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:
  Incomplete

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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  (

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-04-08 Thread Bernie Bernstein
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 
03e8
[   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  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:c16bc1eebc88 EFLAGS: 00010002
[   27.532996] RAX: 0202 RBX: 0202 RCX: 0001
[   27.532998] RDX: 03e8 RSI: 9dde1e80d200 RDI: 2000
[   27.533000] RBP: c16bc1eebc90 R08: 00027080 R09: b8210b0b
[   27.533002] R10: fc35106d5500 R11: 9dde1e86ca90 R12: 9dde0f2db646
[   27.533003] R13: 9dde1b4b9a80 R14: 9dde195eb000 R15: 
[   27.533006] FS:  () GS:9dde1ecc() 
knlGS:
[   27.533008] CS:  0010 DS:  ES:  CR0: 80050033
[   27.533010] CR2: 03e8 CR3: 000411ca6000 CR4: 003406a0
[   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: 03e8
[   27.533380] ---[ end trace af80d2e3030b9f18 ]---


** Tags added: kernel-bug-exists-upstream

-- 
You received this bug notification because you are a member of Kernel
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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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1e

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-04-07 Thread Kai-Heng Feng
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v5.1-rc3 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”, and attach dmesg.

Thanks in advance.

[0] https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.1-rc3/

-- 
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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
 

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-04-07 Thread Kai-Heng Feng
My bad, didn't notice it's AMD graphics instead of Intel graphics.
Please test mainline kernel.

-- 
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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  000

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-04-05 Thread Bernie Bernstein
I don't think this issue is related to LP #1820811.

In #1820811, the hang always occurs when hot-plugging.

With this issue, if the device is cold plugged (plugged in at boot), it
can be disconencted and re-connected without issue.

-- 
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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed748

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-03-21 Thread Bernie Bernstein
It's possible, though it's hard to confirm as I cannot find a kernel
OOPS message in that ticket.

If they can avoid hanging if the dock is plugged in when first booting,
then I think they are very likely related.

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You received this bug notification because you are a member of Kernel
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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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 000

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-03-20 Thread Kai-Heng Feng
Similar to LP: #1820811?

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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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-03-19 Thread Bernie Bernstein
I have verified this issue still exists in kernel version 4.18.0-10.

-- 
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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  () GS:8ed7df6c

[Kernel-packages] [Bug 1819924] Re: System hangs when hot-plugging dual monitor dock

2019-03-13 Thread Kai-Heng Feng
Would it be possible to try kernel < 4.18.0-16?

-- 
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 0320
  PGD 0 P4D 0
  SMP NOPTI
  CPU: 3 PID: 84 Comm: kworker/3:1 Tainted: G  DOE 
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  48 0f b1 13 74 08 48 
89 df e8 b4 ff ff ff 5b 5d c3 90 0f 1f 44
  RSP: 0018:b6c0c1efbd78 EFLAGS: 00010246
  RAX:  RBX: 0320 RCX: 8ed7cfb5c800
  RDX: 8ed7d383 RSI: 0202 RDI: 0320
  RBP: b6c0c1efbd80 R08: 0201 R09: 
  R10:  R11: 8ed7df6e1ac8 R12: 
  R13: 8ed7cfb5c468 R14: 8ed7d3b33f60 R15: 
  FS:  () GS:8ed7df6c() knlGS:
  CS:  0010 DS:  ES:  CR0: 80050033  
  CR2: 0320 CR3: 0003b5d6e000 CR4: 003406a0
  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: 0320
  ---[ end trace 3aa69f7fb354f0c1 ]---
  BUG: unable to handle kernel NULL pointer dereference at 0320
  PGD 0 P4D 0
  RIP: 0010:queue_work_on+0x1b/0x40
  Code:
  SMP NOPTI
  CPU: 0 PID: 974 Comm: Xorg Tainted: G  DOE 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 
  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
  
  44 00 00 89
  48 0f b1
  c8
  RSP: 0018:b6c0c2063c98 EFLAGS: 00010002
  13
  RAX: 0202 RBX: 0202 RCX: 
  74 08 48 89
  RDX: 03a8 RSI: 8ed7df019000 RDI: 2000
  df e8 b4
  RBP: b6c0c2063ca0 R08: 00027080 R09: a25d9e13
  R10: fa628ed74840 R11: 0036 R12: 8ed7cfb5c5e6
  R13: 8ed7801fa800 R14: 0001 R15: 8ed7d3b33f60
  FS:  () GS:8ed7df6c() knlGS: