Re: [Xen-devel] Getting mm.c errors from xl dmesg on certain hardware

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 23.09.11 at 12:29, Anthony Wright <anthony@xxxxxxxxxxxxxxx> wrote:
> Konrad Rzeszutek Wilk wrote:
> 
>>> (XEN) mm.c:907:d0 Error getting mfn 3a09c (pfn 55555555) from L1 entry 
> 000000003a09c023 for l1e_owner=0, pg_owner=0
>>> (XEN) mm.c:907:d0 Error getting mfn 3a09d (pfn 55555555) from L1 entry 
> 000000003a09d023 for l1e_owner=0, pg_owner=0
>>> (XEN) mm.c:907:d0 Error getting mfn 3a09e (pfn 55555555) from L1 entry 
> 000000003a09e023 for l1e_owner=0, pg_owner=0
>>> (XEN) mm.c:907:d0 Error getting mfn 3a09f (pfn 55555555) from L1 entry 
> 000000003a09f023 for l1e_owner=0, pg_owner=0
>>> (XEN) traps.c:2388:d0 Domain attempted WRMSR c0010004 from 
> 0x0000ab23d6d622da to 0x000000000000abcd.
>> Do they show up during bootup? As in do you see those _when_ you launch your 
> guests?
>> To figure out this particular issue you should try using 'console_to_ring' 
> (so that
>> dom0 output and Xen output are mingled togehter) and also post this under a 
> new subject
>> to not confuse this email thread.
> The messages show up during the initial dom0 boot, before any domUs are
> loaded. I've attached a second xl dmesg log which is similar to the
> first, but the numbers in the error messages are different.
> 
> The messages are hardware dependant as I don't get them on another
> system with different hardware configuration but with identical software.
> 
> The motherboard is a ASUS M2N68 AM PLUS, with 4GB of RAM. If I remove
> one of the sticks of ram to take it down to 2GB, the mm.c errors are no
> longer displayed, but I still get the traps.c message.

Would seem most likely to be I/O memory that doesn't get marked
properly when creating the page table entries, thus causing an
unintended phys->mach translation. If there are no kernel messages
associated with this, you will want to put some register/stack dumping
code in to determine what component in the kernel is causing this.

Jan


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