Public bug reported:

Tested: 361, 364 and 367.

NVIDIA bugs in journalctl:
1. Failed to query NVIDIA devices. Please ensure that the NVIDIA device files 
(/dev/nvidia*) exist, and that user 121 has read and write permissions for 
those files.
2. NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [nvidia-smi:568]

$ grep 121 /etc/passwd; lsb_release -a; uname -a
nvidia-persistenced:x:121:129:NVIDIA Persistence Daemon,,,:/:/sbin/nologin
No LSB modules are available.
Distributor ID: Ubuntu
Description:    Ubuntu 16.04 LTS
Release:        16.04
Codename:       xenial
Linux DTC0 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 x86_64 
x86_64 x86_64 GNU/Linux

$ ls -ld /dev/nvidia*; file /dev/nvidia*
crw-rw-rw- 1 root root 195,   0 Jun 12 00:07 /dev/nvidia0
crw-rw-rw- 1 root root 195, 255 Jun 12 00:07 /dev/nvidiactl
crw-rw-rw- 1 root root 195, 254 Jun 12 00:07 /dev/nvidia-modeset
crw-rw-rw- 1 root root 245,   0 Jun 12 00:07 /dev/nvidia-uvm
/dev/nvidia0:        character special (195/0)
/dev/nvidiactl:      character special (195/255)
/dev/nvidia-modeset: character special (195/254)
/dev/nvidia-uvm:     character special (245/0)

NVIDIA Bug Report in attachments. The issue disappears when nvidia
drivers are uninstalled.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: nvidia-361 361.42-0ubuntu2
ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
Uname: Linux 4.4.0-21-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
CurrentDesktop: Unity
Date: Sun Jun 12 00:54:13 2016
InstallationDate: Installed on 2016-06-11 (0 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
SourcePackage: nvidia-graphics-drivers-361
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: nvidia-graphics-drivers-361 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

** Attachment added: "nvidia-bug-report.log.gz"
   
https://bugs.launchpad.net/bugs/1591576/+attachment/4681909/+files/nvidia-bug-report.log.gz

** Description changed:

  Tested: 361, 364 and 367.
  
  NVIDIA bugs in journalctl:
  1. Failed to query NVIDIA devices. Please ensure that the NVIDIA device files 
(/dev/nvidia*) exist, and that user 121 has read and write permissions for 
those files.
  2. NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [nvidia-smi:568]
  
- [code]grep 121 /etc/passwd; lsb_release -a; uname -a
+ $ grep 121 /etc/passwd; lsb_release -a; uname -a
  nvidia-persistenced:x:121:129:NVIDIA Persistence Daemon,,,:/:/sbin/nologin
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 16.04 LTS
  Release:      16.04
  Codename:     xenial
- Linux DTC0 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux[/code]
+ Linux DTC0 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux
  
- [code]ls -ld /dev/nvidia*; file /dev/nvidia*
+ $ ls -ld /dev/nvidia*; file /dev/nvidia*
  crw-rw-rw- 1 root root 195,   0 Jun 12 00:07 /dev/nvidia0
  crw-rw-rw- 1 root root 195, 255 Jun 12 00:07 /dev/nvidiactl
  crw-rw-rw- 1 root root 195, 254 Jun 12 00:07 /dev/nvidia-modeset
  crw-rw-rw- 1 root root 245,   0 Jun 12 00:07 /dev/nvidia-uvm
  /dev/nvidia0:        character special (195/0)
  /dev/nvidiactl:      character special (195/255)
  /dev/nvidia-modeset: character special (195/254)
- /dev/nvidia-uvm:     character special (245/0)[/code]
+ /dev/nvidia-uvm:     character special (245/0)
  
  NVIDIA Bug Report in attachments
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: nvidia-361 361.42-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jun 12 00:54:13 2016
  InstallationDate: Installed on 2016-06-11 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: nvidia-graphics-drivers-361
  UpgradeStatus: No upgrade log present (probably fresh install)

** Description changed:

  Tested: 361, 364 and 367.
  
  NVIDIA bugs in journalctl:
  1. Failed to query NVIDIA devices. Please ensure that the NVIDIA device files 
(/dev/nvidia*) exist, and that user 121 has read and write permissions for 
those files.
  2. NMI watchdog: BUG: soft lockup - CPU#0 stuck for 23s! [nvidia-smi:568]
  
  $ grep 121 /etc/passwd; lsb_release -a; uname -a
  nvidia-persistenced:x:121:129:NVIDIA Persistence Daemon,,,:/:/sbin/nologin
  No LSB modules are available.
  Distributor ID:       Ubuntu
  Description:  Ubuntu 16.04 LTS
  Release:      16.04
  Codename:     xenial
  Linux DTC0 4.4.0-21-generic #37-Ubuntu SMP Mon Apr 18 18:33:37 UTC 2016 
x86_64 x86_64 x86_64 GNU/Linux
  
  $ ls -ld /dev/nvidia*; file /dev/nvidia*
  crw-rw-rw- 1 root root 195,   0 Jun 12 00:07 /dev/nvidia0
  crw-rw-rw- 1 root root 195, 255 Jun 12 00:07 /dev/nvidiactl
  crw-rw-rw- 1 root root 195, 254 Jun 12 00:07 /dev/nvidia-modeset
  crw-rw-rw- 1 root root 245,   0 Jun 12 00:07 /dev/nvidia-uvm
  /dev/nvidia0:        character special (195/0)
  /dev/nvidiactl:      character special (195/255)
  /dev/nvidia-modeset: character special (195/254)
  /dev/nvidia-uvm:     character special (245/0)
  
- NVIDIA Bug Report in attachments
+ NVIDIA Bug Report in attachments. The issue disappears when nvidia
+ drivers are uninstalled.
  
  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: nvidia-361 361.42-0ubuntu2
  ProcVersionSignature: Ubuntu 4.4.0-21.37-generic 4.4.6
  Uname: Linux 4.4.0-21-generic x86_64
  NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Sun Jun 12 00:54:13 2016
  InstallationDate: Installed on 2016-06-11 (0 days ago)
  InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
(20160420.1)
  SourcePackage: nvidia-graphics-drivers-361
  UpgradeStatus: No upgrade log present (probably fresh install)

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https://bugs.launchpad.net/bugs/1591576

Title:
  Ubuntu 16.04 hold on boot and shutdown

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