On Fri, 2012-02-10 at 17:48 +0100, Frederic Weisbecker wrote:

> Stephane Eranian has reported a similar problem but perhaps not with
> the same cause.
> 
> I need to have a look.

Not sure if this is related, but the "script" output of the problem
perf.dat file had this warning:

Warning: Timestamp below last timeslice flush

-- Steve