User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1b4pre) Gecko/20090415 Firefox/3.5b4pre Build Identifier: I've built from http://hg.mozilla.org/releases/mozilla-1.9.1/ with patch applied from bug 489445. I'm seeing crashes when I browse sites which use webfonts, like webfonts.info and http://hsivonen.iki.fi/. Error message on crash is: firefox-bin: cairo-ft-font.c:554: _cairo_ft_unscaled_font_lock_face: Assertion `!unscaled->from_face' failed. I build with enable system cairo which is version 1.8.6. Pango is version 1.24.1. Reproducible: Always

Here is the backtrace I got.

This looks like bug 467874. Can you try the patch at http://cgit.freedesktop.org/cairo/commit/?h=1.8&id=0137b9bd320783264d865a397392b0ee14fd69b3 in your system cairo, please? I'll leave this bug open because we should probably bump the required cairo version (though older versions without this regression may work). The fix is on cairo's 1.8 branch, but there are not yet any releases that include the fix.

Ok, I upgraded cairo to git 1.8 branch, and everything seems to be fine now. Thanks. You can go ahead and close this bug if you want.

marking duplicate of bug 467874.