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

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Sun, Mar 22, 2009 at 01:51:51PM +0200, Pasi Kärkkäinen wrote:
> 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
> 

Please ignore this summary, there was something wrong with my kernel builds or
something. 

I'll post new summary soon when I'm finished with testing. 

-- Pasi

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