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From: Eli Zaretskii <eliz@gnu.org>
To: Stefan Monnier <monnier@IRO.UMontreal.CA>
Cc: 23386@debbugs.gnu.org
Subject: bug#23386: Segfault when messing with font-backend
Date: Wed, 27 Apr 2016 17:02:38 +0300	[thread overview]
Message-ID: <83y47zxi81.fsf@gnu.org> (raw)
In-Reply-To: <jwvlh3zfb45.fsf@iro.umontreal.ca> (message from Stefan Monnier on Wed, 27 Apr 2016 09:13:30 -0400)

> From: Stefan Monnier <monnier@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.





  reply	other threads:[~2016-04-27 14:02 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-04-27 13:13 bug#23386: Segfault when messing with font-backend Stefan Monnier
2016-04-27 14:02 ` Eli Zaretskii [this message]
2016-04-27 14:23   ` Stefan Monnier
2016-07-09 19:11     ` npostavs
2016-07-09 20:02       ` npostavs
2016-07-10 14:18         ` Eli Zaretskii
2016-07-10 20:15           ` npostavs
2016-07-10 17:29       ` Dmitry Antipov
2016-07-10 20:17         ` npostavs
2016-07-11 14:33           ` Eli Zaretskii
2016-07-12 15:20             ` Dmitry Antipov
2016-07-12 17:45               ` Eli Zaretskii
2016-07-12 17:58                 ` Dmitry Antipov

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