kernel-packages team mailing list archive

[Omar Siam <simar@xxxxxxx>]

Public bug reported:

Description:	Ubuntu 16.04 LTS
Release:	16.04
linux-image-generic:
  Installiert:           4.4.0.21.22
  Installationskandidat: 4.4.0.21.22
  Versionstabelle:
 *** 4.4.0.21.22 500
        500 http://at.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
        100 /var/lib/dpkg/status
I would expect the system to boot up like it did before I upgraded to xenial
When I try to boot my virtual machine host using a xenial based Xen system (Xen 4.6, linux generic 4.4.0) it crashes immediately.
My system setup is non standard as I tried to fix the dom0 memory using dom0_mem. This is due to this FAQ entry: http://zfsonlinux.org/faq.html#CanIRunZFSForXenHypervisor . I use ZFS for virutal machine disks and other storage.
The systems bios is not updated by manufacturer anymore (2013). The on board graphics card is used.
Shared graphics memory is set to auto. Setting it to 128 MB didn't change anything.
Using a wily kernel 4.2.0 generic or a 4.1.22 mainline kernel works.
Using a mainline kernel 4.4.8 or 4.5.2 also crashes.
A quick google search using the first crash report line leads to this
https://lkml.org/lkml/2015/8/19/366
and this
http://code.metager.de/source/history/linux/stable/arch/x86/xen/
I checked that the two patches that seem most relevant here are present in the ubuntu kernel.
Workaround is to not force a particular amount of memory for dom0 (delete dom0_mem parameter)

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: Incomplete

** Attachment added: "Xen crash log captured using the serial port, an ubuntu-bug apport form the running system after I removed the dom0_mem parameter and a log of fwts I ran with the same kernel but without Xen. Whatever apport says: This is not the bug I'm filing here."
   https://bugs.launchpad.net/bugs/1577018/+attachment/4652226/+files/Crash%20Xen%204.6%20linux%204.4%20and%20up.tar.lzma

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https://bugs.launchpad.net/bugs/1577018

Title:
  Kernel crashes on dom0 startup when dom0_mem is set

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Description:	Ubuntu 16.04 LTS
  Release:	16.04
  linux-image-generic:
    Installiert:           4.4.0.21.22
    Installationskandidat: 4.4.0.21.22
    Versionstabelle:
   *** 4.4.0.21.22 500
          500 http://at.archive.ubuntu.com/ubuntu xenial/main amd64 Packages
          100 /var/lib/dpkg/status
  I would expect the system to boot up like it did before I upgraded to xenial
  When I try to boot my virtual machine host using a xenial based Xen system (Xen 4.6, linux generic 4.4.0) it crashes immediately.
  My system setup is non standard as I tried to fix the dom0 memory using dom0_mem. This is due to this FAQ entry: http://zfsonlinux.org/faq.html#CanIRunZFSForXenHypervisor . I use ZFS for virutal machine disks and other storage.
  The systems bios is not updated by manufacturer anymore (2013). The on board graphics card is used.
  Shared graphics memory is set to auto. Setting it to 128 MB didn't change anything.
  Using a wily kernel 4.2.0 generic or a 4.1.22 mainline kernel works.
  Using a mainline kernel 4.4.8 or 4.5.2 also crashes.
  A quick google search using the first crash report line leads to this
  https://lkml.org/lkml/2015/8/19/366
  and this
  http://code.metager.de/source/history/linux/stable/arch/x86/xen/
  I checked that the two patches that seem most relevant here are present in the ubuntu kernel.
  Workaround is to not force a particular amount of memory for dom0 (delete dom0_mem parameter)

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