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 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 

.. and then the next time (-3.txt) it was sata_promise again triggering that 
BUG.. 

-- Pasi

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