Re: [Xen-devel] [xen-unstable test] 17613: regressions - FAIL

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 11.04.13 at 01:41, xen.org <ian.jackson@xxxxxxxxxxxxx> wrote:
> flight 17613 xen-unstable real [real]
> http://www.chiark.greenend.org.uk/~xensrcts/logs/17613/ 
> 
> Regressions :-(
> 
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-i386-qemut-rhel6hvm-intel  9 guest-start.2     fail REGR. vs. 
> 17610

So this is one of the BUG_ON()s added by bd9be94 triggering,
and this is not a false positive. scale_delta() is simply not suitable
for negative inputs, and the main question is why gtime_to_gtsc()
caps its input to 0 only for PV domains, or whether (considering
that this parameter is u64) __update_vcpu_system_time() should
already cap it to zero. Not to speak of the question how the
calculation there could end up negative in the first place.

Stefano, Keir (21445:c1ed00d49534)?

Jan


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