bug#5499: 23.1.91; SVG circular reference locks up Emacs

[Chong Yidong]

The bug you reported appears to be a librsvg bug.  To see this, create
an svg image with the following contents:

<svg xmlns:xlink="http://www.w3.org/1999/xlink";
     xmlns="http://www.w3.org/2000/svg"; width="200" height="200">
  <defs>
    <linearGradient id="linearGradient2" xlink:href="#linearGradient2"/>
  </defs>
  <g>
    <rect width="100%" height="100%" style="fill:url(#linearGradient2)"/>
  </g>
</svg>

Any librsvg-based application that tries to open this file should lock
up.  I've tested with gqview and eog.  I have filed this bug in the
Gnome Bugzilla (Bug 608575):

  http://bugzilla.gnome.org/show_bug.cgi?id=608575

I will close this in the Emacs bug database, since it is not an Emacs
bug per se.  Thanks.