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[Xen-devel] ongoing platform timer wraps (was: [xen-unstable test] 17402: regressions - FAIL)

>>> On 25.03.13 at 22:59, xen.org <ian.jackson@xxxxxxxxxxxxx> wrote:
> flight 17402 xen-unstable real [real]
> http://www.chiark.greenend.org.uk/~xensrcts/logs/17402/ 
> Regressions :-(
> Tests which did not succeed and are blocking,
> including tests which could not be run:
>  test-amd64-i386-xl-win7-amd64 10 guest-saverestore.2      fail REGR. vs. 
> 17399

The log here (on itch-mite, as before) has another platform timer
wrap instance, followed by the NMI watchdog kicking in (again in
guest context, i.e. again an almost certainly false positive caused
by the corruption of time stamps).

You never responded either way to the debugging patch* I had
posted for this, but I continue to think we need to put in
something at least temporarily (i.e. until we understand what's
going on here). Unless this is a hardware glitch (or the wrap
detection somehow produces a false positive, which I currently
can't see how that would happen), I actually suspect two
problems - the occurrence of the wrap, and something with the


* http://lists.xen.org/archives/html/xen-devel/2013-03/msg01072.html

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