Setting a very long user name crashes unity-window-decorator

[Jean-Baptiste Lallement]

TEST CASE:
1. Create a very long user name
 $ python -c 'print "0123456789" * 30'>/tmp/longname.txt
2. Open gnome-control-center's 'Users Accounts' applet
3. Paste the content of /tmp/longame.txt into the name field

Result:
The system becomes unresponsive and unity-window-decorator crashes. If it is restarted manually, it crashes again immediately.

ProblemType: Crash
DistroRelease: Ubuntu 11.10
Package: compiz-gnome 1:0.9.5.0-0ubuntu1
ProcVersionSignature: Ubuntu 3.0.0-7.8-generic 3.0.0
Uname: Linux 3.0.0-7-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Tue Jul 26 12:11:40 2011
DistUpgraded: Fresh install
DistroCodename: oneiric
DistroVariant: ubuntu
ExecutablePath: /usr/bin/unity-window-decorator
GraphicsCard:
 Intel Corporation N10 Family Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
   Subsystem: ASUSTeK Computer Inc. Device [1043:83ac]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110209)
MachineType: ASUSTeK Computer INC. 1015PE
ProcCmdline: /usr/bin/unity-window-decorator
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-7-generic root=UUID=014cdf46-1d84-4e78-a68e-5d6de3419ad9 ro quiet splash vt.handoff=7
SegvAnalysis:
 Segfault happened at: 0xb2ad34 <g_datalist_id_set_data_full+356>: mov 0x0(%ebp),%ecx
 PC (0x00b2ad34) ok
 source "0x0(%ebp)" (0xaaaaaaa8) not located in a known VMA region (needed readable region)!
 destination "%ecx" ok
SegvReason: reading unknown VMA
Signal: 11
SourcePackage: compiz
StacktraceTop:
 g_datalist_id_set_data_full () from /lib/i386-linux-gnu/libglib-2.0.so.0
 ?? () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
 gtk_object_dispose (gobject=0x9b45050) at /build/buildd/gtk+2.0-2.24.5/gtk/gtkobject.c:426
 gtk_widget_dispose (object=0x9b45050) at /build/buildd/gtk+2.0-2.24.5/gtk/gtkwidget.c:8775
 g_object_unref () from /usr/lib/i386-linux-gnu/libgobject-2.0.so.0
Title: unity-window-decorator crashed with SIGSEGV in g_datalist_id_set_data_full()
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare
dmi.bios.date: 05/31/2010
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0402
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: 1015PE
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: x.xx
dmi.chassis.asset.tag: 0x00000000
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK Computer INC.
dmi.chassis.version: x.x
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0402:bd05/31/2010:svnASUSTeKComputerINC.:pn1015PE:pvrx.x:rvnASUSTeKComputerINC.:rn1015PE:rvrx.xx:cvnASUSTeKComputerINC.:ct10:cvrx.x:
dmi.product.name: 1015PE
dmi.product.version: x.x
dmi.sys.vendor: ASUSTeK Computer INC.
version.compiz: compiz 1:0.9.5.0-0ubuntu1
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11~1-0ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11~1-0ubuntu4
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.2-1ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.0-3ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Jean-Baptiste Lallement (jibel)]

I added a task for gnome-control-center because it should do boundary checking and prevent user of setting unreasonably long values and thus break a system.

[Apport retracing service (apport)]

Thank you for taking the time to report this crash and helping to make Ubuntu better. This particular crash has already been reported and is a duplicate of bug #807487, so is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Please continue to report any other bugs you may find.

[Sebastien Bacher (seb128)]

Could you open a new bug using apport for gnome-control-center?

[Will Cooke (willcooke)]

As part of the big bug clear up for 16.04 LTS I am marking this bug as Wont Fix.
These types of crasher are better handled by errors.ubutnu.com which can collate similar crash reports to help us identify persitent bugs rather than one-off crashes.
Sorry we are not able to help with this specific issue. If you are still experiencing this crash, please re-open the bug and add the tag "desktop-bugscrub-reopened". See https://wiki.ubuntu.com/BigDesktopBugScrub for more information.