Re: [Xen-devel] pv_ops dom0 kernel failure with ata_piix

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Thu, Jan 01, 2009 at 08:36:33AM +1100, Jeremy Fitzhardinge wrote:
> Pasi Kärkkäinen wrote:
> >On Tue, Dec 30, 2008 at 08:18:45PM +0200, Pasi Kärkkäinen wrote:
> >  
> >>On Tue, Dec 30, 2008 at 06:52:11PM +0200, Pasi Kärkkäinen wrote:
> >>    
> >>>On Tue, Dec 30, 2008 at 11:47:40AM -0500, Todd Deshane wrote:
> >>>      
> >>>>On Tue, Dec 30, 2008 at 11:28 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> >>>>        
> >>>>>>>Try changing the SATA mode of the disk in the BIOS to either legacy 
> >>>>>>>or
> >>>>>>>ATA, depending
> >>>>>>>on what you bios supports.
> >>>>>>>
> >>>>>>>There is still a known issue with some of the AHCI stuff.
> >>>>>>>
> >>>>>>>              
> >>>>>>I'm not using AHCI at all.. AHCI (SATA) controller does not have any 
> >>>>>>disks
> >>>>>>plugged in.
> >>>>>>
> >>>>>>My (only) disk is attached to IDE/PATA ICH6 controller..
> >>>>>>
> >>>>>>            
> >>>>>I tried disabling AHCI anyway (even when I'm not using the AHCI SATA
> >>>>>controller), but it didn't help.
> >>>>>
> >>>>>Booting the pv_ops dom0 kernel still fails.. because the IDE/PATA 
> >>>>>controller
> >>>>>still gets disabled (just like in the logs above) for some unknown 
> >>>>>reason.
> >>>>>
> >>>>>-- Pasi
> >>>>>          
> >>>>So from the log it looks like you are getting a hard crash?
> >>>>
> >>>>        
> >>>No, it's not a hard crash.. I'm able to reboot the box with 
> >>>ctrl-alt-del. 
> >>>      
> >>>>Did you try adding noreboot to the xen command line and then trying
> >>>>to get any more information with sysreq stuff?
> >>>>
> >>>>Another thing that I noticed in the log is:
> >>>>
> >>>>irq 12: nobody cared (try booting with the "irqpoll" option)
> >>>>
> >>>>Is it an smp kernel? I had some weird problems when passing nosmp at
> >>>>one point.
> >>>>
> >>>>        
> >>>Yep, it is SMP kernel.. 
> >>> 
> >>>      
> >>>>I don't recognize this crash, those module traces, at least for me were
> >>>>non-fatal and didn't cause a crash. I was normally just dropped to a
> >>>>initramfs prompt in the case when the disk was not detected properly.
> >>>>
> >>>>I was then able to at least look around and check that modules were
> >>>>loaded correctly etc.
> >>>>
> >>>>        
> >>>The problem seems to be the IDE controller/disk is not detected at all..
> >>>because the device gets disabled for some reason during ata_piix
> >>>loading/probing.. 
> >>>
> >>>That is the only disk I have, so the root partition is on it.
> >>>
> >>>Same kernel works just fine on baremetal without Xen.
> >>>
> >>>      
> >>So I guess the subject should be 'failure with ata_piix' instead of 
> >>'crash'.. 
> >>Anyway, there seems to be problems with ata_piix too.. in addition to 
> >>AHCI.
> >>
> >>Jeremy: Can you think of anything to try? 
> >>
> >>    
> >
> >I tried booting with "nosmp" dom0 kernel parameter:
> >  
> 
> Yes, nosmp is known to make things worse.  It has the side-effect of 
> disabling io_apic support, so all the interrupt stuff fails in the way 
> you've noticed.
> 

Yep. "nosmp" was just something I tried to see if it makes any difference.
It didn't help.

Anyway, have you seen/heard of this problem with ata_piix earlier? 

http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-1.txt
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-2.txt

Same kernel on baremetal without Xen:
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/baremetal-dmesg.txt

-- Pasi

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