Public bug reported:

After update from 12.10 to 13.04 beta.

ProblemType: Crash
DistroRelease: Ubuntu 13.04
Package: xfce4-panel 4.10.0-1ubuntu2
ProcVersionSignature: Ubuntu 3.8.0-17.27-generic 3.8.6
Uname: Linux 3.8.0-17-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.9.2-0ubuntu5
Architecture: amd64
AssertionMessage: xfce4-panel: 
/build/buildd/cairo-1.12.14/src/cairo-ft-font.c:701: 
_cairo_ft_unscaled_font_unlock_face: Assertion `unscaled->lock_count > 0' 
failed.
Date: Tue Apr  9 20:22:13 2013
ExecutablePath: /usr/bin/xfce4-panel
InstallationDate: Installed on 2011-11-13 (513 days ago)
InstallationMedia: Xubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
ProcCmdline: xfce4-panel --display :0.0 --sm-client-id 
2a6d890b6-18c1-4b13-b2f9-2ef94bbcb9e0
Signal: 6
SourcePackage: xfce4-panel
StacktraceTop:
 __assert_fail_base (fmt=0x7ff7de65a578 "%s%s%s:%u: %s%sAssertion `%s' 
failed.\n%n", assertion=assertion@entry=0x7ff7dffe5bae "unscaled->lock_count > 
0", file=file@entry=0x7ff7dffe5c88 
"/build/buildd/cairo-1.12.14/src/cairo-ft-font.c", line=line@entry=701, 
function=function@entry=0x7ff7dffe5f80 "_cairo_ft_unscaled_font_unlock_face") 
at assert.c:92
 __GI___assert_fail (assertion=0x7ff7dffe5bae "unscaled->lock_count > 0", 
file=0x7ff7dffe5c88 "/build/buildd/cairo-1.12.14/src/cairo-ft-font.c", 
line=701, function=0x7ff7dffe5f80 "_cairo_ft_unscaled_font_unlock_face") at 
assert.c:101
 ?? () from /usr/lib/x86_64-linux-gnu/libcairo.so.2
 gr::PangoGrFont::unlockFace() () from 
/usr/lib/x86_64-linux-gnu/pango/1.8.0/modules/graphite/pango-graphite.so
 gr::PangoGrFont::~PangoGrFont() () from 
/usr/lib/x86_64-linux-gnu/pango/1.8.0/modules/graphite/pango-graphite.so
Title: xfce4-panel assert failure: xfce4-panel: 
/build/buildd/cairo-1.12.14/src/cairo-ft-font.c:701: 
_cairo_ft_unscaled_font_unlock_face: Assertion `unscaled->lock_count > 0' 
failed.
UpgradeStatus: Upgraded to raring on 2013-04-07 (2 days ago)
UserGroups: adm admin audio cdrom dialout dip fax floppy fuse lp lpadmin netdev 
plugdev sambashare scanner tape vboxusers video

** Affects: xfce4-panel (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-crash need-amd64-retrace raring

** Information type changed from Private to Public

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https://bugs.launchpad.net/bugs/1166951

Title:
  xfce4-panel assert failure: xfce4-panel:
  /build/buildd/cairo-1.12.14/src/cairo-ft-font.c:701:
  _cairo_ft_unscaled_font_unlock_face: Assertion `unscaled->lock_count >
  0' failed.

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