bug#15688: Changes that should go into version 24.4

[Stefan]

> Not sure if those are related, but if they aren't, how can we explain
> that only Richard experiences these problems?

My guess is that they only show up on Yeeloong, or maybe mips.
Could even be a compiler bug, for all I know.

> In http://debbugs.gnu.org/cgi/bugreport.cgi?bug=15688#107, Stefan
> described some insight on the problem, and Richard suggested that
> someone writes debugging code to detect the situation that apparently
> is a precursor to the crash.  No one wrote such a code, AFAIK; perhaps
> we should.  (I don't understand what Stefan said enough to do this,
> but maybe someone else does.)

I'm not sure what kind of code could catch this, nor when to run it.


        Stefan