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Re: [Xen-devel] 2.6.29-rc7 pv_ops dom0 BUG / unable to handle kernel pag

To: Pasi Kärkkäinen <pasik@xxxxxx>
Subject: Re: [Xen-devel] 2.6.29-rc7 pv_ops dom0 BUG / unable to handle kernel paging request
From: Jeremy Fitzhardinge <jeremy@xxxxxxxx>
Date: Wed, 11 Mar 2009 16:40:24 -0700
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Pasi Kärkkäinen wrote:
On Wed, Mar 11, 2009 at 10:52:50PM +0200, Pasi Kärkkäinen wrote:
On Sun, Mar 08, 2009 at 01:54:01PM +0200, Pasi Kärkkäinen wrote:
On Sat, Mar 07, 2009 at 10:09:16PM -0800, Jeremy Fitzhardinge wrote:
Pasi Kärkkäinen wrote:

Latest git tree (updated some hours ago) boots up fine for me, xend can be started etc, but some time after starting kernel compilation I get the following BUG:


(XEN) mm.c:2006:d0 Bad type (saw 28000001 != exp e0000000) for mfn 436a3 (pfn 3d0a3) (XEN) mm.c:707:d0 Error getting mfn 436a3 (pfn 3d0a3) from L1 entry 00000000436a3063 for dom0
(XEN) mm.c:3640:d0 ptwr_emulate: could not get_page_from_l1e()
BUG: unable to handle kernel paging request at c01cbd58
IP: [<c0405d2f>] xen_set_pte+0x8c/0x96
Well, that's bad news. It was trying to map a highmem pte page which didn't have the Pinned bit set on its page, but Xen thought it was a pinned pte page. Not sure how it could get into that state, but its indicative of general memory corruption.

What was going on at the time?  Was dom0 busy?  Were you running some domUs?

At that time I was compiling a kernel on dom0.. so dom0 was busy.

No other domains running.
Same thing happened again.. with the latest tree (as of today).

Again I was compiling a kernel in dom0, so dom0 was busy. No other domains

The exact same kernel booted on baremetal without Xen works OK, and doesn't
BUG during kernel compilation.

That's good to know as a baseline, though the bug is Xen refusing to do a pte update, so I'd be surprised if it happened with Xen in the picture ;)

What happens if you disable CONFIG_HIGHPTE?


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