Re: [Xen-devel] (XEN) traps.c:3156: GPF messages in xen dmesg

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 17.12.12 at 17:48, Valtteri Kiviniemi <kiviniemi.valtteri@xxxxxxxxx> 
>>> wrote:
> I'm running Xen 4.2.0 with Linux kernel 3.7.0 and I'm seeing a flood of
> these messages in xen dmesg:
> 
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> (XEN) traps.c:3156: GPF (0060): ffff82c480159247 -> ffff82c4802170e4
> 
> What does that mean and is it something that I should worry about?

It means that the hypervisor recovered from #GP faults several
times. What exactly it was that faulted you'd need to look up by
translating the addresses above and resolving them to source
locations. That'll also tell you whether you ought to be worried.

A common example of these happening is Xen carrying out MSR
accesses on behalf of the kernel, when the MSR actually isn't
implemented (i.e. the kernel itself also is prepared to handle
faults upon accessing them).

Jan


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