Re: [Xen-devel] [BUG] Xen vm kernel crash in get_free_entries.

[Astarta <astarta@xxxxxx>]

On 10/17/2013 12:55 PM, Astarta wrote:
> On 10/16/2013 06:17 PM, Pasi KÃrkkÃinen wrote:
> > On Wed, Oct 16, 2013 at 02:29:07PM +0100, David Vrabel wrote:
> > > On 16/10/13 07:28, Astarta wrote:
> > > > Hello,
> > > >
> > > > This is a some kind of a follow up to the
> > > > http://lists.xen.org/archives/html/xen-devel/2013-09/msg03109.html (
> > > > Linux 3.11.1 HVM guest kernel crash when started with xl
> > > > (get_free_entries)).
> > > >
> > > > Looks like we've here the similar issue.
> > > >
> > > > Xen VM with 3.8.13 kernel crashes in get_free_entries (kernel BUG at
> > > > drivers/xen/grant-table.c:1181!), i.e in:
> > > > BUG_ON(grefs_per_grant_frame == 0);. 3.11.5 kernel behaves in exactly
> > > > the same way.
> > > >
> > > > Whole kernel log is attached. It does not contain  any "Grant tables
> > > > using version" message.
> > > >
> > > > Seems that gnttab_request_version() has was never executed, so
> > > > grefs_per_grant_frame was never set.
> > > >
> > > > Could you please advice on this issue?
> > > I think you're missing the platform pci device required for PVHVM.
> > > What's your VM's xl.cfg?
> > Yes, exactly, I had "xen_platform_pci=0" in my VM's xl.cfg,
> > and I assume Astarta has aswell.
> >
> > That is because I wanted to test *without* PVHVM, and that is a valid 
> > configuration imho..
> > (and works OK with xm/xend).
> >
> > -- Pasi
> Thanks for the suggestion, but there is no xl.cfg in /etc/xen/ (we're 
> using Citrix XenServer Host 6.2.0-70446c
>  on rhel 6.2), so there is no where to edit xen_platform_pci option.
>
> I've attached output from xe vm-list params=all for one of the problem 
> vm. Hope its also ok.
> Also 3.6 kernel works well with that configuration. I can provide it's 
> boot log if needed.
> Please suggest.
>
> --
> Marina

will answer by myself. Setting platform:device_id to 1 manually helps 
the 3.11.5 kernel to boot.
I used xe command for this in the below way.
xe vm-param-set uuid=<VM UUID> platform:device_id=0001

The issue that platform:device_id is 0002 for citrix xen by default and 
the latest kernel doesnt boot in this configuration...
Where do we go from there?

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