bug#22305: 24.5; permanent 100% CPU load for no apparent reason

[Roland Winkler]

On Mon Jan 4 2016 Eli Zaretskii wrote:
> Not necessarily.  AFAIR, 'top' shows the CPU usage of each program
> in terms of processor execution units.  IOW, 100% means Emacs is
> pegging a single execution unit.

Sure.  My point is that normally `top' says that my emacs session
does not take more than 2 or 3% CPU load.  Yet suddenly this goes up
to 100% and the fan starts running loudly, too.

> How many execution units (cores) do you have on that system?

`lshw' says

  Intel(R) Core(TM) i7-5600U CPU @ 2.60GHz

which, I believe, comes with four cores.

> When this happens, attach a debugger and show us the backtrace,
> including the Lisp backtrace.

Thanks, will do that.