This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1647048

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1647048

Title:
  System freezes after login

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Hi,

  Since I updated to kubuntu 16.10 I quite often have the situation that
  my laptop completely freezes after login in sddm (that means: while
  KDE is loading).

  During that time:
  - Fans run high
  - laptop is completely unuseable (no mouse or keyboard-input accepted, can't 
switch to other terminal, etc ...) - only a long press to the power-button 
helps .
  - network-connections break (tried to monitor the system remotely, but when 
the error occurs, also the ssh-connection fails)
  - the kern.log stops and contains only a few lines of rubbish:
  Dec  3 11:01:37 orbit kernel: [   18.951805] ACPI: \_SB_.PCI0.PEG0.PEGP: 
failed to evaluate _DSM
  Dec  3 11:01:37 orbit kernel: [   18.951808] ACPI Warning: 
\_SB.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI 
requires [Package] (20160422/nsarguments-95)
  Dec  3 11:01:37 orbit kernel: [   18.951891] nouveau 0000:01:00.0: DRM: 
suspending console...
  Dec  3 11:01:37 orbit kernel: [   18.951894] nouveau 0000:01:00.0: DRM: 
suspending display...
  Dec  3 11:01:37 orbit kernel: [   18.951902] nouveau 0000:01:00.0: DRM: 
evicting buffers...
  Dec  3 11:01:37 orbit kernel: [   18.960908] nouveau 0000:01:00.0: DRM: 
waiting for kernel channels to go idle...
  Dec  3 11:01:37 orbit kernel: [   18.960935] nouveau 0000:01:00.0: DRM: 
suspending client object trees...
  Dec  3 11:01:37 orbit kernel: [   18.961192] nouveau 0000:01:00.0: DRM: 
suspending kernel object tree...
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  
^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@^@
  ...
  - installed and tested kernel-crashdump, but in this situation it is not 
triggered (or fails to write a coredump)
  - (once I tried to leave the machin alone for about 30 min, it does not 
recover...)

  As a last resort, I installed netconsole and captured the kernel.log
  on a remote machine, this revealed, that during the lookup, following
  "soft lockups" occur:

  [  107.926161] NMI watchdog: BUG: soft lockup - CPU#0 stuck for 22s! 
[baloo_file:2491]
  [  107.926172] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm[  135.919531] NMI watchdog: BUG: 
soft lockup - CPU#0 stuck for 22s! [baloo_file:2491]
  [  135.919536] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm[  159.917848] NMI watchdog: BUG: 
soft lockup - CPU#2 stuck for 22s! [systemd-timesyn:502]
  [  159.917853] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm[  163.912901] NMI watchdog: BUG: 
soft lockup - CPU#0 stuck for 22s! [baloo_file:2491]
  [  163.912904] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm[  187.911218] NMI watchdog: BUG: 
soft lockup - CPU#2 stuck for 23s! [systemd-timesyn:502]
  [  187.911221] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm[  191.906272] NMI watchdog: BUG: 
soft lockup - CPU#0 stuck for 22s! [baloo_file:2491]
  [  191.906275] Modules linked in: vmnet(OE) vmw_vsock_vmci_transport vsock 
vmw_vmci vmmon(OE) ccm rfcomm bnep joydev acer_wmi sparse_keymap 
snd_hda_codec_hdmi intel_rapl x86_pkg_temp_thermal coretemp kvm_intel kvm 
irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel 
aes_x86_64 lrw glue_helper ablk_helper cryptd intel_cstate arc4 intel_rapl_perf 
ath9k ath9k_common ath9k_hw ath input_leds mac80211 uvcvideo serio_raw 
videobuf2_vmalloc videobuf2_memops videobuf2_v4l2 ath3k videobuf2_core btusb 
btrtl videodev btbcm rtsx_pci_ms btintel cfg80211 media snd_hda_codec_realtek 
bluetooth snd_hda_codec_generic lpc_ich memstick snd_hda_intel snd_hda_codec 
snd_hda_core snd_hwdep snd_seq_midi snd_pcm

  About my setup:
  lsb_release -rd
  Description:    Ubuntu 16.10
  Release:        16.10
  (using kubuntu)

  uname -a
  Linux orbit 4.8.0-28-generic #30-Ubuntu SMP Fri Nov 11 14:03:52 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux

  Attached tgz contains:
  - the log taken from netconsole
  - the kernel-log from the frozen machine (the netconsole.log belongs to the 
freeeze at "Dec  3 14:09:40")
  - the output of dpkg -l (to provide a full list of installed 
packages/versions)

  The issue occurs approx. every 3-4 logins, regardless whether it's a
  fersh startup, or if i logged out before/change user.

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