Re: 2.6.25-rc1 xen pvops regression

[Joel Becker <Joel.Becker@oracle.com>]

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

-- 

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