bug#24640: Crashes in 25.1

[Eli Zaretskii]

> From: Reuben Thomas <rrt@sc3d.org>
> Date: Sat, 8 Oct 2016 16:26:30 +0100
> Cc: 24640@debbugs.gnu.org
> 
>  Well, can you tell why it crashed this time? IOW, what was the
>  immediate cause of SIGSEGV?
> 
> ​Exactly the same as before: crashed while lazy-reloading in desktop.el. At 
> the same point as before, as far as
> I can tell.

No, I meant the immediate cause of SIGSEGV, one frame below the one
which invokes the signal handler.  There must be some bad data there,
what it is?