pkg/46926: High cpu usage Xorg DragonFly x86_64, suspect cairo

[davshao%gmail.com@localhost]

>Number:         46926
>Category:       pkg
>Synopsis:       High cpu usage Xorg DragonFly x86_64, suspect cairo
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    pkg-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sat Sep 08 22:40:00 +0000 2012
>Originator:     David Shao
>Release:        DragonFly 3.1-DEVEL i386 and x86_64
>Organization:
>Environment:
DragonFly 3.1-DEVEL x86_64
>Description:
Some change between the end of Thursday, 2012-09-06 and current pkgsrc
on DragonFly 3-1-DEVEL x86_64, Shuttle SG45H7, Intel Core 2 Quad CPU Q9400, I 
believe ICH10, Radeon 4550

commit 0059b35c3db980... Sat Sep 8 07:07:14 2012 -0700

is producing high cpu usage, sometimes near 100%.  It is particularly bad 
opening multiple applications such as gvim.  I suspect the cairo update 
described in
http://mail-index.netbsd.org/pkgsrc-changes/2012/09/07/msg077984.html

I rate this bug as serious because it essentially renders Xorg, Xfce4, etc. 
unusable on this machine.


>How-To-Repeat:
Update to
commit 0059b35c3db980... Sat Sep 8 07:07:14 2012 -0700
and pkg_rolling-replace -uv on DragonFly 3-1-DEVEL x86_64
>Fix: