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bug#22289: 24.3; Emacs crashes on loading file

From: Alex Burr
Subject: bug#22289: 24.3; Emacs crashes on loading file
Date: Sat, 2 Jan 2016 14:29:23 +0000 (UTC)

Yes, it seems to have been compiled with imagemagick support.
I don't have 14Gb of ram :-)
So, the problem is then that this is not any kind of image. It's a text file (actually a
program for http://art.kano.me, which expects coffeescript). If I run:
 convert Identify nelson.art
imagemagick tells me that I have a 26708x29472 1-bit ART image, which explains the problem!
It loads normally if I rename the file not to have the .art suffix. So I can solve my immediate problem.

It's not clear to me whether imagemagick is making a real mistake here. it doesn't seem
to do any significant checking on the image header: https://github.com/ImageMagick/ImageMagick/blob/7ce65e7125a4e1df1a274ce373c537a9df9c16cd/coders/art.c
However these old formats often didn't include any redundancy anyway.

However it does seem like any filename ending in .art is a bit dangerous for emacs at the moment.


From: Eli Zaretskii <address@hidden>
To: Lars Magne Ingebrigtsen <address@hidden>
Cc: address@hidden; address@hidden
Sent: Saturday, January 2, 2016 8:26 AM
Subject: Re: bug#22289: 24.3; Emacs crashes on loading file

> From: Lars Magne Ingebrigtsen <address@hidden>

> Date: Sat, 02 Jan 2016 03:57:17 +0100
> Cc: address@hidden
> Alex Burr <address@hidden> writes:
> > 1) loaded attached file 'nelson.art' with ctrl-x f
> > 2) emacs then proceeded to malloc all core, causing linux to grind to a halt.
> If I save the image to a file and then use "display" to display it, my
> machine grinds to a halt for 15 seconds, and then display says it can't
> display it...
> Could be an imagemagick bug of some kind...

Alex, was your Emacs compiled with Imagemagick support?  Mine wasn't,
so visiting that file does nothing special.

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