bug#17771: 24.3.91; SIGSEGV in cleanup_vector

[Eli Zaretskii]

> From: Stephen Berman <stephen.berman@gmx.net>
> Date: Fri, 13 Jun 2014 11:12:44 +0200
> 
> 
> 0. emacs -Q
> 1. C-h h (on my machine, it takes ~30 seconds for the Hello file to
>    appear; during that time, do the following:)
> 2. Type C-g repeatedly (I did it rapidly, for ~15 seconds).
> 3. Emacs crashes, full backtrace below.  (This is reliably reproducible.)

Not here, but this is Windows, where input is treated very
differently.

> Program received signal SIGSEGV, Segmentation fault.
> 0x00000000005aa564 in cleanup_vector (vector=0x43b4ea8)
>     at ../../../../bzr/emacs/emacs-24/src/alloc.c:2929
> 2929          ((struct font *) vector)->driver->close ((struct font *) 
> vector);

So which one is the bad pointer, vector, vector->driver, or
vector->driver->close?