Unfortunately I no longer have the WD15 dock. I switched to TB16 and it
also has some hotplugging issue (there is a separate launchpad ticket
reported by others).

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https://bugs.launchpad.net/bugs/1701499

Title:
  System often freezes or panics if I log in with Dell Dock WD15
  connected

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I'm using Dell Precision 5520 with Ubuntu 17.04.

  If I first start a Unity session and then connect Dell WD15 USB-C dock
  with an external diplay plugged in, the system detects it properly and
  all the things work flawlessly (ethernet, external keyboard, external
  display, external storage connected to USB on the dock). I can plug-in
  and plug-out the dock multiple times and it just works.

  However if I boot the laptop with the dock already plugged in, first I
  get to the login screen and initially all is ok. Both screens are
  activated, and I can log in using the keyboard connected to the dock.

  When I hit "Enter", both screens go blank for a while, then they turn
  back on and I can see the desktop. A second or maybe two seconds later
  things start falling apart. When I move the mouse pointer a second
  after logging, it is kinda "jumpy", the movement is not smooth. The
  move freezes for a few times. I observed this behaviour only when
  moving the wireless mouse connected to the USB of the laptop. The
  builtin touchpad works smoothly.

  If it was the only issue, this would be a very minor annoyance.
  Sometimes, after a few short mouse pointer freezes the system starts
  working smoothly and all is rock stable from that point. However quite
  often I noticed much worse things happen:

  1. The mouse pointer and everything freezes totally after a few
  seconds from displaying the desktop. It is not possible to switch to
  the console with Ctrl-Alt-F1. This happens in >50% of logins.

  2. Kernel panic.

  I observed this behavior with stable Ubuntu kernel 4.10.0-20, as well
  as 4.11.0 - 4.11.8 (which I'm using now, because 4.11.x seems more
  stable than 4.10.0-x) and also 4.12.rc5 which I tried once.

  Even if everything goes fine, I noticed the following errors printed
  in syslog. I'm not sure if they are related, but they look very iffy
  to me:

  Jun 30 10:46:23 p5520 kernel: [   38.391971] DMAR: DRHD: handling fault 
status reg 2
  Jun 30 10:46:23 p5520 kernel: [   38.391977] DMAR: [INTR-REMAP] Request 
device [3e:00.0] fault index 1e [fault reason 38] Blocked an interrupt request 
due to source-id verification failure
  Jun 30 10:46:23 p5520 kernel: [   38.472490] xhci_hcd 0000:0a:00.0: remove, 
state 1
  Jun 30 10:46:23 p5520 kernel: [   38.472496] usb usb4: USB disconnect, device 
number 1
  Jun 30 10:46:23 p5520 kernel: [   38.472497] usb 4-1: USB disconnect, device 
number 2
  Jun 30 10:46:23 p5520 kernel: [   38.472498] usb 4-1.2: USB disconnect, 
device number 3
  Jun 30 10:46:23 p5520 NetworkManager[1129]: <info>  [1498812383.7510] device 
(eth0): state change: disconnected -> unmanaged (reason 'removed') [30 10 36]
  Jun 30 10:46:23 p5520 ModemManager[1076]: <info>  (net/eth0): released by 
modem 
/sys/devices/pci0000:00/0000:00:1d.6/0000:06:00.0/0000:07:02.0/0000:0a:00.0/usb4/4-1/4-1.2
  Jun 30 10:46:23 p5520 NetworkManager[1129]: <info>  [1498812383.7537] devices 
removed (path: 
/sys/devices/pci0000:00/0000:00:1d.6/0000:06:00.0/0000:07:02.0/0000:0a:00.0/usb4/4-1/4-1.2/4-1.2:1.0/net/eth0,
 iface: eth0)
  Jun 30 10:46:23 p5520 kernel: [   38.552718] xhci_hcd 0000:0a:00.0: Host halt 
failed, -19
  Jun 30 10:46:23 p5520 kernel: [   38.552721] xhci_hcd 0000:0a:00.0: Host not 
accessible, reset failed.
  Jun 30 10:46:23 p5520 kernel: [   38.552722] xhci_hcd 0000:0a:00.0: USB bus 4 
deregistered
  Jun 30 10:46:23 p5520 kernel: [   38.552728] xhci_hcd 0000:0a:00.0: remove, 
state 1
  Jun 30 10:46:23 p5520 kernel: [   38.552731] usb usb3: USB disconnect, device 
number 1
  Jun 30 10:46:23 p5520 kernel: [   38.552732] usb 3-1: USB disconnect, device 
number 2
  Jun 30 10:46:23 p5520 kernel: [   38.552732] usb 3-1.5: USB disconnect, 
device number 3
  Jun 30 10:46:23 p5520 kernel: [   38.553322] usb 3-1.7: USB disconnect, 
device number 4
  Jun 30 10:46:23 p5520 kernel: [   38.556064] BUG: unable to handle kernel 
paging request at 0000002018387ad8
  Jun 30 10:46:23 p5520 kernel: [   38.556173] IP: __radix_tree_lookup+0x10/0xf0
  Jun 30 10:46:23 p5520 kernel: [   38.556230] PGD 0 
  Jun 30 10:46:23 p5520 kernel: [   38.556232] 
  Jun 30 10:46:24 p5520 kernel: [   38.556280] Oops: 0000 [#1] SMP
  Jun 30 10:46:24 p5520 kernel: [   38.556320] Modules linked in: ccm rfcomm 
cdc_ether usbnet snd_usb_audio snd_usbmidi_lib r8152 mii snd_hda_codec_hdmi 
cmac msr uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 
videobuf2_core videodev media btusb btrtl joydev hid_multitouch ipmi_devintf 
ipmi_msghandler bnep nls_iso8859_1 arc4 dell_led snd_hda_codec_realtek 
snd_hda_codec_generic i2c_designware_platform i2c_designware_core dell_wmi 
snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep snd_pcm snd_seq_midi 
intel_rapl snd_seq_midi_event x86_pkg_temp_thermal snd_rawmidi intel_powerclamp 
coretemp kvm_intel kvm snd_seq irqbypass crct10dif_pclmul crc32_pclmul 
dell_rbtn ghash_clmulni_intel pcbc snd_seq_device dell_laptop snd_timer 
dell_smbios dcdbas iwlmvm dell_smm_hwmon mac80211 aesni_intel aes_x86_64 
crypto_simd glue_helper cryptd
  Jun 30 10:46:24 p5520 kernel: [   38.556557] swap_info_get: Bad swap offset 
entry 24000001b40
  Jun 30 10:46:24 p5520 kernel: [   38.556558] BUG: Bad page map in process 
systemd-udevd  pte:90000006d00052 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556559] addr:00007f4a83c00000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:27
  Jun 30 10:46:24 p5520 kernel: [   38.556563] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556564] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G     U          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556565] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556565] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556568]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556569]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556571]  ? __swap_info_get+0x5d/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556571]  ? _swap_info_get+0x12/0x50
  Jun 30 10:46:24 p5520 kernel: [   38.556572]  unmap_page_range+0x562/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556573]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556574]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556575]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556577]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556578]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556579]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556580]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556581]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556582]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556582]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556584]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556585] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556586] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556587] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556587] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556587] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556588] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556588] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556589] swap_info_get: Bad swap offset 
entry 180c001c0280
  Jun 30 10:46:24 p5520 kernel: [   38.556589] BUG: Bad page map in process 
systemd-udevd  pte:603000700a00018 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556590] addr:00007f4a83c01000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:28
  Jun 30 10:46:24 p5520 kernel: [   38.556592] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556593] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556593] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556593] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556594]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556595]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556595]  ? __swap_info_get+0x5d/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556596]  ? _swap_info_get+0x12/0x50
  Jun 30 10:46:24 p5520 kernel: [   38.556597]  unmap_page_range+0x562/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556598]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556599]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556600]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556601]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556602]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556602]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556603]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556604]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556605]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556605]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556606]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556607] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556607] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556608] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556609] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556609] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556609] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556610] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556610] BUG: Bad page map in process 
systemd-udevd  pte:2800010000003333 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556611] addr:00007f4a83c03000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:2a
  Jun 30 10:46:24 p5520 kernel: [   38.556613] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556613] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556613] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556614] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556614]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556615]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556616]  ? print_bad_pte+0x1ee/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556616]  ? __swap_info_get+0x5d/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556617]  vm_normal_page+0x90/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556618]  unmap_page_range+0x576/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556619]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556619]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556620]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556622]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556622]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556623]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556624]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556624]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556625]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556626]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556627]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556627] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556627] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556628] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556628] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556628] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556629] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556629] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556631] swap_info_get: Bad swap file 
entry 1a0021837618faf6
  Jun 30 10:46:24 p5520 kernel: [   38.556631] BUG: Bad page map in process 
systemd-udevd  pte:860dd863ebd9af8 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556632] addr:00007f4a83c04000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:2b
  Jun 30 10:46:24 p5520 kernel: [   38.556633] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556634] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556634] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556634] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556635]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556635]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556636]  ? __swap_info_get+0x91/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556637]  ? _swap_info_get+0x12/0x50
  Jun 30 10:46:24 p5520 kernel: [   38.556638]  unmap_page_range+0x562/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556639]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556639]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556640]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556641]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556642]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556643]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556644]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556645]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556646]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556646]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556647]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556648] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556648] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556648] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556649] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556649] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556649] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556649] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556650] BUG: Bad page map in process 
systemd-udevd  pte:80fe01111800c568 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556651] addr:00007f4a83c05000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:2c
  Jun 30 10:46:24 p5520 kernel: [   38.556652] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556653] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556653] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556653] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556654]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556654]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556655]  ? print_bad_pte+0x1ee/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556656]  ? __swap_info_get+0x91/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556656]  vm_normal_page+0x69/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556657]  unmap_page_range+0x576/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556658]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556659]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556660]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556661]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556661]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556662]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556663]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556664]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556664]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556665]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556666]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556666] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556666] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556667] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556667] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556667] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556668] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556668] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556669] swap_info_get: Bad swap offset 
entry be3c00000000
  Jun 30 10:46:24 p5520 kernel: [   38.556669] BUG: Bad page map in process 
systemd-udevd  pte:2f8f000000000000 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556670] addr:00007f4a83c06000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:2d
  Jun 30 10:46:24 p5520 kernel: [   38.556671] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556671] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  Jun 30 10:46:24 p5520 kernel: [   38.556672] Hardware name: Dell Inc. 
Precision 5520/06X96V, BIOS 1.3.3 05/08/2017
  Jun 30 10:46:24 p5520 kernel: [   38.556672] Call Trace:
  Jun 30 10:46:24 p5520 kernel: [   38.556672]  dump_stack+0x63/0x81
  Jun 30 10:46:24 p5520 kernel: [   38.556673]  print_bad_pte+0x1df/0x2b0
  Jun 30 10:46:24 p5520 kernel: [   38.556674]  ? __swap_info_get+0x5d/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556674]  ? _swap_info_get+0x12/0x50
  Jun 30 10:46:24 p5520 kernel: [   38.556675]  unmap_page_range+0x562/0x930
  Jun 30 10:46:24 p5520 kernel: [   38.556676]  unmap_single_vma+0x7d/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556677]  unmap_vmas+0x51/0xa0
  Jun 30 10:46:24 p5520 kernel: [   38.556678]  exit_mmap+0xa7/0x170
  Jun 30 10:46:24 p5520 kernel: [   38.556679]  mmput+0x57/0x130
  Jun 30 10:46:24 p5520 kernel: [   38.556680]  do_exit+0x295/0xb30
  Jun 30 10:46:24 p5520 kernel: [   38.556680]  ? __secure_computing+0x3f/0xe0
  Jun 30 10:46:24 p5520 kernel: [   38.556681]  ? syscall_trace_enter+0xcd/0x2e0
  Jun 30 10:46:24 p5520 kernel: [   38.556682]  do_group_exit+0x43/0xb0
  Jun 30 10:46:24 p5520 kernel: [   38.556682]  SyS_exit_group+0x14/0x20
  Jun 30 10:46:24 p5520 kernel: [   38.556683]  do_syscall_64+0x5b/0xc0
  Jun 30 10:46:24 p5520 kernel: [   38.556684]  
entry_SYSCALL64_slow_path+0x25/0x25
  Jun 30 10:46:24 p5520 kernel: [   38.556684] RIP: 0033:0x7f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556684] RSP: 002b:00007ffc965e0f98 
EFLAGS: 00000206 ORIG_RAX: 00000000000000e7
  Jun 30 10:46:24 p5520 kernel: [   38.556685] RAX: ffffffffffffffda RBX: 
00007ffc965e1060 RCX: 00007f4a82e35738
  Jun 30 10:46:24 p5520 kernel: [   38.556686] RDX: 0000000000000000 RSI: 
000000000000003c RDI: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556686] RBP: 00007ffc965e1110 R08: 
00000000000000e7 R09: fffffffffffffe50
  Jun 30 10:46:24 p5520 kernel: [   38.556686] R10: 00007f4a83129b50 R11: 
0000000000000206 R12: 0000000000000000
  Jun 30 10:46:24 p5520 kernel: [   38.556687] R13: 0000000000000000 R14: 
0000000000000003 R15: 000000000000000e
  Jun 30 10:46:24 p5520 kernel: [   38.556687] BUG: Bad page map in process 
systemd-udevd  pte:2ff8f84e07df7c6 pmd:46463c067
  Jun 30 10:46:24 p5520 kernel: [   38.556688] addr:00007f4a83c07000 
vm_flags:08000070 anon_vma:          (null) mapping:ffff907a1afed288 index:2e
  Jun 30 10:46:24 p5520 kernel: [   38.556689] file:libacl.so.1.1.0 
fault:ext4_filemap_fault mmap:ext4_file_mmap readpage:ext4_readpage
  Jun 30 10:46:24 p5520 kernel: [   38.556690] CPU: 0 PID: 3268 Comm: 
systemd-udevd Tainted: G    BU          4.11.8-041108-generic #201706290836
  --- 
  ApportVersion: 2.20.4-0ubuntu4.1
  Architecture: amd64
  CurrentDesktop: Unity:Unity7
  DistributionChannelDescriptor:
   # This is a distribution channel descriptor
   # For more information see 
http://wiki.ubuntu.com/DistributionChannelDescriptor
   canonical-oem-somerville-xenial-amd64-20160624-2
  DistroRelease: Ubuntu 17.04
  InstallationDate: Installed on 2017-04-12 (78 days ago)
  InstallationMedia: Ubuntu 16.04 "Xenial" - Build amd64 LIVE Binary 
20160624-10:47
  Package: linux (not installed)
  Tags:  zesty
  Uname: Linux 4.11.8-041108-generic x86_64
  UnreportableReason: The running kernel is not an Ubuntu kernel
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True

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