Re: 2.6.25-rc1 xen pvops regression

Joel Becker
2008-02-16T08:57:55Z

On Sat, Feb 16, 2008 at 01:44:26PM +1100, Jeremy Fitzhardinge wrote:
> Joel Becker wrote:
>
>> (XEN) mm.c:1825:d109 Bad type (saw 0000000028000001 != exp
>> 00000000e0000000) for mfn 3a2f0f (pfn f0)
>> (XEN) mm.c:649:d109 Error getting mfn 3a2f0f (pfn f0) from L1 entry
>> 00000003a2f0f063 for dom109
>> (XEN) mm.c:1825:d109 Bad type (saw 0000000028000001 != exp
>> 00000000e0000000) for mfn 3a2f0f (pfn f0)
>> (XEN) mm.c:649:d109 Error getting mfn 3a2f0f (pfn f0) from L1 entry
>> 00000003a2f0f063 for dom109
>> (XEN) mm.c:3331:d109 ptwr_emulate: could not get_page_from_l1e()
>>
>
> Hm, I have a suspicion about what this might be. I'll haven't tried
> reproducing it yet though.
>
>> (XEN) Unhandled page fault in domain 109 on VCPU 0 (ec=0003)
>> (XEN) Pagetable walk from 00000000c01687f0:
>> (XEN) L4[0x000] = 00000003a2933027 00000000000006cc
>> (XEN) L3[0x003] = 000000039afea027 0000000000000005
>> (XEN) L2[0x000] = 000000039bfb7067 0000000000001048 (XEN) L1[0x168] =
>> 00000003a2e97061 0000000000000168
>> (XEN) domain_crash_sync called from entry.S
>> (XEN) Domain 109 (vcpu#0) crashed on cpu#2:
>> (XEN) ----[ Xen-3.1.3-rc3 x86_64 debug=n Not tainted ]----
>> (XEN) CPU: 2
>> (XEN) RIP: e019:[<00000000c04040bd>]
>>
>
> What does this EIP correspond to in your kernel? Also:
>
> c01687f0 c0417ab6 c040288f c040299a c0403270
>
> (as guesses of potential callers to try and work out a stack trace).

ksymoops is no help at all, but I got these from objdump of
vmlinux:

c04040bd xen_set_pte
c0417ab6 set_pte_present
c040288f set_bit
c040299a __raw_spin_unlock
c0403270 __set_64bit

Joel

--

Dort wo man Bücher verbrennt, verbrennt man am Ende auch Mensch.
(Wherever they burn books, they will also end up burning people.)
- Heinrich Heine

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127