bug#45511: 27.1; Emacs crashes in gui_produce_glyphs when using a custom function for org-roam-insert

[Eli Zaretskii]

> From: Maikol Solís <maikol.solis@ucr.ac.cr>
> Date: Mon, 28 Dec 2020 09:32:17 -0600
> 
> Everything is fine except that after a couple of times using it, emacs 
> crashes completely.  I think that is
> caused by this function because this has never happened before.
> 
> I used `gdb` to follow the crash and this is the output:
> 
>      Thread 1 "emacs-gtk" received signal SIGSEGV, Segmentation fault.

Is this a normal build of Emacs, or did you build some branch of the
Git repository?  (I'm puzzled why the thread is called "emacs-gtk".)

>      gui_produce_glyphs (it=0x7fff82fc3650) at xdisp.c:29925
>      29925         struct font *font = face->font;
>      (gdb) next

At this point, please say

   (gdb) source /path/to/emacs/src/.gdbinit
   (gdb) bt

(replacing "/path/to/emacs" with the real location of the Emacs
sources on your system) and post the result.