Re: [Xen-devel] xen.git branch reorg / success with 2.6.30-rc3 pv_ops dom0

[Pasi Kärkkäinen <pasik@xxxxxx>]

On Mon, May 18, 2009 at 08:06:26PM +0300, Pasi Kärkkäinen wrote:
> On Mon, May 18, 2009 at 03:57:07PM +0100, Ian Campbell wrote:
> > Hi Pasi,
> > 
> > On Thu, 2009-05-07 at 13:24 -0400, Pasi Kärkkäinen wrote:
> > > On Wed, May 06, 2009 at 02:51:59PM -0700, Jeremy Fitzhardinge wrote:
> > > > Great!  I'd be interested to know if you're still having HIGHPTE 
> > > > problems.  It may or may not have got fixed.
> > > > 
> > > 
> > > I just tried with CONFIG_HIGHPTE=y but that didn't seem to work:
> > > http://pasik.reaktio.net/xen/pv_ops-dom0-debug/pv_ops-dom0-bootlog-30-xen331-linux-2.6.30-rc3-next-crash-with-highpte.txt
> > > 
> > > (XEN) mm.c:2006:d0 Bad type (saw 28000001 != exp e0000000) for mfn 6b0a6 
> > > (pfn 2c959)
> > > (XEN) mm.c:707:d0 Error getting mfn 6b0a6 (pfn 2c959) from L1 entry 
> > > 000000006b0a6063 for dom0
> > > (XEN) mm.c:3640:d0 ptwr_emulate: could not get_page_from_l1e()
> > 
> > I thought I might have a poke at this, how do you go about reproducing
> > it? I've used your .config and it boots OK -- now I'm trying a kernbench
> > run since I think you mentioned compiling a kernel in domain 0 at one
> > point.
> > 
> 
> I can reproduce it every time like this:
> 
> - boot into pv_ops dom0 kernel
> - run "make bzImage && make modules"
> - wait for the kernel compilation to finish..
> - *crash*, before the compilation finishes, usually within 15-30mins
> 

Oh, and the crash happens only when dom0 kernel is built with CONFIG_HIGHPTE=y.
dom0 kernel compiled with CONFIG_HIGHPTE=n survives this test without crashing.

-- Pasi

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