Re: [Xen-devel] Possible bug, dom0 crash on ubuntu

[Stefan Bader <stefan.bader@xxxxxxxxxxxxx>]

On 17.06.2012 05:23, Rolu wrote:
> On Sun, Jun 17, 2012 at 5:04 AM, AP <apxeng@xxxxxxxxx> wrote:
>>
>> On Jun 16, 2012 5:56 PM, "Rolu" <rolu@xxxxxxxx> wrote:
>>>
>>> When booting a recently compiled Xen 4.2 on Ubuntu 12.04, dom0
>>> crashes. I've included a serial console log below.
>>>
>>> I've used:
>>> Xen 4.2 unstable rev. 25483, compiled on the same machine. I had to
>>> apply the AT_EMPTY_PATH patch from
>>> http://lists.gnu.org/archive/html/qemu-devel/2012-02/msg03460.html to
>>> get it to compile.
>>> Linux 3.2.0-25, which is the default kernel in Ubuntu's repository right
>>> now.
>>> Ubuntu 12.04 Precise
>>>
>>> Booting with the default Xen 4.1 from the Ubuntu repositories works.
>>>
>>> Using the kernel from
>>> http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.4-precise/, which is
>>> a mainline Linux kernel (and also more recent) works with my compiled
>>> version of Xen 4.2
>>>
>>> So,
>>> * Is xen 4.2 not happy with the 3.2 kernel I've used?
>>> * Is this due to something Ubuntu modified in their default kernel?
>>> * Is this an issue with Xen?
>>> * Did I break something?
>>
>> This is an issue with the Ubuntu kernel. Check this thread out:
>> http://lists.xen.org/archives/html/xen-devel/2012-05/msg00049.html
>>
This is an issue between libc not checking all flags correctly and a current
hack to work around a bug on older Xen versions.
If I understood correctly there was a fix going into libc but I am also in the
process of changing that hack to prevent those issues. But it will go into 12.10
first and then move backwards.

-Stefan

>> Adding xsave=0 to the Xen kernel line in grub is the workaround.
>>
> 
> Indeed, this worked. Thanks!
> 
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