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
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