[PATCH] powerpc: irq work racing with timer interrupt can result in timer interrupt hang

Gabriel Paubert paubert at iram.es
Sat May 10 07:50:05 EST 2014

On Fri, May 09, 2014 at 06:41:13AM -0700, Paul E. McKenney wrote:
> On Fri, May 09, 2014 at 05:47:12PM +1000, Anton Blanchard wrote:
> > I am seeing an issue where a CPU running perf eventually hangs.
> > Traces show timer interrupts happening every 4 seconds even
> > when a userspace task is running on the CPU.
> Is this by chance every 4.2 seconds?  The reason I ask is that
> Paul Clarke and I are seeing an interrupt every 4.2 seconds when
> he runs NO_HZ_FULL, and are trying to get rid of it.  ;-)

Hmmm, it's close to 2^32 nanoseconds, isnt't it suspiscious?


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