[Pkg-xfce-devel] Bug#496277: xfce4-menu-plugin segfaults, causing xfce-panel to exit on startup

[Ian MacKinnell]

Package: xfdesktop4
Version: 4.4.2-7

After doing a dist-upgrade on Friday AEST, every time I login to an XFCE 
session via GDM (e.g. after a cold boot or after logging out and logging 
back in), XFCE starts without panels. The panels do actually appear, 
then instantly disappear (they are displayed for less than a second).

When I run xfce-panel from the command line, it exhibits the same 
behaviour, but also gives the following message, which seems to indicate 
that the fault lies in xfce-menu-plugin, which is part of part of 
xfdesktop4:

--- SIGSEGV (Segmentation fault) @ 0 (0) ---
(xfce4-menu-plugin:3603): Gdk-WARNING **: GdkWindow 0x2200003 
unexpectedly destroyed
The program 'xfce4-menu-plugin' received an X Window System error.
This probably reflects a bug in the program.
The error was 'BadWindow (invalid Window parameter)'.
  (Details: serial 156 error_code 3 request_code 18 minor_code 0)
  (Note to programmers: normally, X errors are reported asynchronously;
   that is, you will receive the error a while after causing it.
   To debug your program, run it with the --sync command line
   option to change this behavior. You can then get a meaningful
   backtrace from your debugger if you break on the gdk_x_error() function.)
+++ killed by SIGSEGV +++

If it helps, I have libglib2.0-0 (version 2.16.4-2) and libgtk2.0-0 
(version 2.12.11-3). My debian testing system is completely up to date 
according to apt-get dist-upgrade and according to synaptic.

If I open the desktop menu by right-clicking on the desktop background, 
the menu works OK unless I pass over "Graphics" or "Games", at which 
point the menu instantly disappears instead of displaying the submenu, 
and all my desktop icons disappear, and I have to press Alt-F2 to get a 
prompt to run xfce-setting-show, go to Desktop Preferences and switch 
back on "Allow XFCE to manage the desktop". In other words, the menu is 
crashing AND causing a configuration change on the XFCE desktop.

All this happened as a result of a daily dist-upgrade on Friday night 
(22 Aug) AEST.