bug#24640: Crashes in 25.1

[Eli Zaretskii]

> From: Reuben Thomas <rrt@sc3d.org>
> Date: Sat, 8 Oct 2016 14:30:41 +0100
> Cc: 24640@debbugs.gnu.org
> 
>  So the value of 'ptr' there (frame 20 in the 1st backtrace) is of
>  interest.
> 
> ​The current backtrace seems to have crashed at a different point, and 
> doesn't even include this line, but this
> time I've kept the gdb session running in case I can tell you anything else 
> of ​
> ​interest.​

Well, can you tell why it crashed this time?  IOW, what was the
immediate cause of SIGSEGV?