GNU bug report logs - #23386
Segfault when messing with font-backend

Previous Next

Full log

Message #8 received at 23386 <at> debbugs.gnu.org (full text, mbox):

From: Eli Zaretskii <eliz <at> gnu.org>
To: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
Cc: 23386 <at> debbugs.gnu.org
Subject: Re: bug#23386: Segfault when messing with font-backend
Date: Wed, 27 Apr 2016 17:02:38 +0300

> From: Stefan Monnier <monnier <at> IRO.UMontreal.CA>
> Date: Wed, 27 Apr 2016 09:13:30 -0400
> 
> If I do
> 
>     % emacs -Q --eval "(push '(font-backend x) default-frame-alist)"
> 
> I get a segfault.  This is with the latest emacs-25.

Not reproducible here, but then I cannot run an X version.  (I did try
an equivalent for Windows; it didn't crash.)

> See the backtrace below.
> 
> 
>         Stefan
> 
> 
> Program received signal SIGSEGV, Segmentation fault.
> 0xf70b3b36 in XftCharIndex () from /usr/lib/i386-linux-gnu/libXft.so.2
> (gdb) xbacktrace
> (gdb) bt
> #0  0xf70b3b36 in XftCharIndex () from /usr/lib/i386-linux-gnu/libXft.so.2
> #1  0x082d4d69 in xftfont_encode_char (font=0x8779b00, c=92) at xftfont.c:537

Can you tell which arguments to XftCharIndex were invalid in this
case?

Also, is 'x' a valid font-backend symbol?  It's strange that Emacs
uses xftfont when it should have been using xfont instead (AFAIU).
But I'm far from being an expert in this area.

Thanks.

Previous Next

GNU bug tracking system
Copyright (C) 1999 Darren O. Benham, 1997,2003 nCipher Corporation Ltd, 1994-97 Ian Jackson.