Re: [Xen-devel] 2.6.29-rc8 pv_ops dom0 BUG / unable to handle kernel paging request

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sat, Mar 21, 2009 at 09:28:55PM -0700, Jeremy Fitzhardinge wrote:
> Pasi Kärkkäinen wrote:
> >On Sun, Mar 22, 2009 at 12:50:31AM +0200, Pasi Kärkkäinen wrote:
> >  
> >>On Sat, Mar 21, 2009 at 10:16:52PM +0200, Pasi Kärkkäinen wrote:
> >>    
> >>>>Also, do you see this problem before you've started any other domains?  
> >>>>Or does it only happen once you've run a domU (or only while a domU is 
> >>>>running)?
> >>>>
> >>>>        
> >>>I'm not running any other domains.. Only dom0 is running.
> >>>
> >>>Steps to reproduce this BUG on my pv_ops dom0 testbox:
> >>>
> >>>1) Reboot the box to pv_ops dom0 kernel
> >>>2) Login to dom0 via ssh
> >>>3) Start kernel compilation on dom0 (make bzImage && make modules)
> >>>4) Wait some minutes and pv_ops dom0 kernel BUGs
> >>>
> >>>So no other domains has been or is running when this happens..
> >>>
> >>>I'll try disabling CONFIG_HIGHPTE now, and see if that makes any 
> >>>difference.
> >>>
> >>>      
> >>CONFIG_HIGHPTE=y and pv_ops dom0 survives up for maybe 30 mins, and then
> >>BUGs (during kernel compilation):
> >>http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-22-xen331-linux-2.6.29-rc8-bug-with-highpte.txt
> >>
> >>
> >>CONFIG_HIGHPTE=n and I get BUG during system startup when udev is started:
> >>http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-23-xen331-linux-2.6.29-rc8-bug-no-highpte.txt
> >>
> >>Starting udev: BUG: unable to handle kernel paging request at 70007823
> >>IP: [<e30ce245>] pdc_common_ops+0x171/0xfffffcfe [sata_promise]
> >>*pdpt = 000000005f781001 
> >>Oops: 0002 [#1] SMP 
> >>
> >>So yeah..  with CONFIG_HIGHPTE=n it seems to happen when sata_promise is 
> >>loaded.. What should I try next? 
> >>    
> >
> >Actually it's not only sata_promise. I tried 2 more times with the
> >CONFIG_HIGHPTE=n pv_ops dom0 kernel:
> >
> >http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-23-xen331-linux-2.6.29-rc8-bug-no-highpte.txt
> >http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-23-xen331-linux-2.6.29-rc8-bug-no-highpte-2.txt
> >http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-23-xen331-linux-2.6.29-rc8-bug-no-highpte-3.txt
> >
> >BUG: unable to handle kernel paging request at a536462c
> >IP: [<e30f4278>] classes+0x688/0xfffffa30 [parport]
> >*pdpt = 000000005f759001 
> >Oops: 0002 [#1] SMP 
> >  
> 
> Hm, OK.  Something is clearly drastically amiss.  I'll try to repro.
> 

Actually it seems CONFIG_HIGHPTE=n kernel fails also on baremetal:
http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-24-baremetal-2.6.29-rc8-bug-no-highpte.txt

Starting udev: invalid opcode: 0000 [#1] SMP 

Summary:
CONFIG_HIGHPTE=n: both dom0 and baremetal fail during system startup when udev 
is started
CONFIG_HIGHPTE=y: baremetal works OK, dom0 fails with BUG after around 30 mins 
of kernel compilation

-- Pasi

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel