ports/141162: x11-toolkits/pango 1.26 introduces crashes with epiphany, firefox35, possibly others

[okeeblow]

>Number:         141162
>Category:       ports
>Synopsis:       x11-toolkits/pango 1.26 introduces crashes with epiphany, firefox35, possibly others
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-ports-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Fri Dec 04 06:20:01 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     okeeblow
>Release:        8.0-RELEASE
>Organization:
>Environment:
FreeBSD Emi.cooltrainer.org 8.0-RELEASE-p1 FreeBSD 8.0-RELEASE-p1 #7: Thu Dec  3 13:37:32 EST 2009     jnr at Emi.cooltrainer.org:/usr/obj/usr/src/sys/GENERIC  amd64

>Description:
Firefox 3.5 and Epiphany both segmentation fault when loading certain pages. Nothing on the pages stand out as a conspicuous cause. 

Firefox crashes with all browser plugins removed and with a brand new "test" profile. The new-profile first-run "Welcome to Firefox" page crashes the browser.

A debugging Firefox binary produces the following segfault:

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 8085021c0 (LWP 100413)]
0x0000000803ed9d78 in pango_ot_tag_from_script () from /usr/local/lib/libpangoft2-1.0.so.0

And this backtrace: http://pastebin.com/f189d5178
>How-To-Repeat:
Load an affected web page in either browser, such as the first-run "welcome to firefox" page.
>Fix:
Install ports-mgmt/portdowngrade and downgrade x11-toolkits/pango to:

3  2009/08/02 19:36:28  1.24.5

>Release-Note:
>Audit-Trail:
>Unformatted: