unity hung while trying to maximize window (null pointer exception)

[Rocko]

Binary package hint: unity

I clicked maximize on the apport window, and unity hung. I could move the mouse and switch to a tty console, but switching back just gave me a black screen. I'm reporting it in case the .xsession-errors files have any useful information.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.4-0ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic x86_64
NonfreeKernelModules: nvidia
Architecture: amd64
CheckboxSubmission: 1bd8e90541d49b96c13cbfcc9baf103b
CheckboxSystem: d00f84de8a555815fa1c4660280da308
CompizPlugins: [core,bailer,detection,composite,opengl,decor,compiztoolbox,place,session,mousepoll,resize,vpswitch,move,wall,snap,gnomecompat,regex,thumbnail,animation,workarounds,expo,ezoom,staticswitcher,fade,scale,unityshell]
Date: Sat Apr 9 12:29:23 2011
InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Alpha amd64 (20100224.1)
ProcEnviron:
 LANGUAGE=en_AU:en
 PATH=(custom, user)
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: Upgraded to natty on 2011-04-08 (0 days ago)

[Rocko (rockorequin)]

The relevant information seems to be at the end; it looks like glib got a null pointer:

** (<unknown>:3571): DEBUG: MaximizeIfBigEnough: Apport-gtk window size doesn't fit

(<unknown>:3571): GLib-GObject-WARNING **: instance of invalid non-instantiatable type `(null)'

(<unknown>:3571): GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(<unknown>:3571): GLib-GObject-WARNING **: instance with invalid (NULL) class pointer

(<unknown>:3571): GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(<unknown>:3571): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(<unknown>:3571): GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(<unknown>:3571): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(<unknown>:3571): GLib-GObject-CRITICAL **: g_signal_handler_disconnect: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(nm-applet:3595): GdkPixbuf-CRITICAL **: gdk_pixbuf_composite: assertion `dest_y >= 0 && dest_y + dest_height <= dest->height' failed

[Omer Akram (om26er)]

Thanks for the bug report. This particular bug has already been reported and is a duplicate of bug 755078, so is being marked as such. Any further discussion regarding the bug should occur in the other report. Feel free to report any other bugs you may find.