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Re: [Bug 1514022] Re: System freeze


Hi Joseph,
the issue started happening after the upgrade from 15.04 to wily.
Before I would have freezes only when unplugging a usb hard drive and 
they were related to powersave tools pm-powersave, laptop-mode. The 
current freezes also only seem to only happen when on battery so they 
might also be related to powersave issues.
The only other thing I noticed is that I find a certain sequence of 
events related to the Network Manager renewing the DHCP lease in the 
logs shortly before the crash. At this point the Network manager resets 
the device MPU and the system MPU value and seems to fail at some point. 
But it could still be coincidence.
I will look at trying out the new kernels but obviously I will be 
running into a problem because I am using proprietary Broadcom WIFI 
drivers that have to be uninstalled before changing the kernel. I will 
have to first make sure that I have the files to reinstall them after a 
kernel upgrade. I am not sure which files they are and were to fin them. 
Looking at the above DHCP/MTU issues this driver might even be connected 
to the problem.
Kind Regards

On 10.11.2015 02:54, Joseph Salisbury wrote:
> Did this issue start happening after an update/upgrade?  Was there a
> prior kernel version where you were not having this particular problem?
> Would it be possible for you to test the latest upstream kernel? Refer
> to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
> v4.3 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".
> Thanks in advance.
> [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v4.3-wily/
> ** Changed in: linux (Ubuntu)
>     Importance: Undecided => Medium
> ** Changed in: linux (Ubuntu)
>         Status: Confirmed => Incomplete

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  System freeze

Status in linux package in Ubuntu:

Bug description:
  System freezes at random occasions with no recovery (tried ctrl alt F1, ctrl alt t, etc.) 
  No traces in the syslog.
  Fans keep running so system seems to be under load.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-17-generic 4.2.0-17.21
  ProcVersionSignature: Ubuntu 4.2.0-17.21-generic 4.2.3
  Uname: Linux 4.2.0-17-generic x86_64
  NonfreeKernelModules: wl
  ApportVersion: 2.19.1-0ubuntu4
  Architecture: amd64
   /dev/snd/pcmC0D0p:   thomas     3499 F...m pulseaudio
   /dev/snd/controlC0:  thomas     3499 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sat Nov  7 12:54:52 2015
  HibernationDevice: RESUME=UUID=ed1eaca8-c94e-4f78-974d-dc28348c9f3a
  InstallationDate: Installed on 2015-04-26 (194 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
  MachineType: Hewlett-Packard HP EliteBook 8470p
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-17-generic root=UUID=39f2e8b4-3b7f-49fa-8e72-91650c69d50e ro quiet splash vt.handoff=7
   linux-restricted-modules-4.2.0-17-generic N/A
   linux-backports-modules-4.2.0-17-generic  N/A
   linux-firmware                            1.149.1
  SourcePackage: linux
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: Upgraded to wily on 2015-11-03 (3 days ago)
  dmi.bios.date: 07/16/2013
  dmi.bios.vendor: Hewlett-Packard
  dmi.bios.version: 68ICF Ver. F.43
  dmi.board.name: 179B
  dmi.board.vendor: Hewlett-Packard
  dmi.board.version: KBC Version 42.36
  dmi.chassis.asset.tag: CNU342CNXN
  dmi.chassis.type: 10
  dmi.chassis.vendor: Hewlett-Packard
  dmi.modalias: dmi:bvnHewlett-Packard:bvr68ICFVer.F.43:bd07/16/2013:svnHewlett-Packard:pnHPEliteBook8470p:pvrA1029D1103:rvnHewlett-Packard:rn179B:rvrKBCVersion42.36:cvnHewlett-Packard:ct10:cvr:
  dmi.product.name: HP EliteBook 8470p
  dmi.product.version: A1029D1103
  dmi.sys.vendor: Hewlett-Packard

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