bug#40049: 26.1; Coredump on GNUS reading e-mail

[Eli Zaretskii]

> From: Sergey Organov <sorganov@gmail.com>
> Date: Fri, 13 Mar 2020 08:23:59 +0300
> 
> Emacs coredumps when GNUS tries to read some kinds of mails.
> 
> To reproduce from 'emacs -Q', untar attached file that will create
> 'gnus-coredump' directory with a single mail file in it, then:
> 
> $ emacs -Q
> M-x gnus
> G D ;; gnus-group-enter-directory
> <type directory name> RET
> 
> GNUS then tries to open this directory as group and Emacs crashes. The
> backtrace and other information follows:

This recipe should be run with -xrm "emacs.synchronous: true", so that
the X protocol errors are acted upon immediately where they happen.
then the GDB backtrace will be much more informative, as it will show
the code which causes this.

Anyway, this looks like a font problem we fixed some time ago, so
upgrading to Emacs 26.3 or (better) to the pretest of Emacs 27 should
fix this, I think.  Another potential solution is to uninstall the
offending font (Noto Color, perhaps?).

Thanks.