Public bug reported:

Binary package hint: xfwm4

Write a little program that produces hundreds of windows.   Then try to
stop it: you'll find that you cannot.   Your mouse and keyboard actions
get ignored.

Execute this with python.   I use the "python-matplotlib" module to make
plots simply because that's where I first got burned, and that's an easy
way to make lots of windows:

sudo aptitude install python-matplotlib
python <<ENDEND
import pylab

for i in range(400):
    pylab.figure(i+1)
    pylab.plot([1,2])
pylab.show()
ENDEND

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: xfwm4 4.8.1-1
ProcVersionSignature: Ubuntu 2.6.38-9.43-generic 2.6.38.4
Uname: Linux 2.6.38-9-generic x86_64
Architecture: amd64
Date: Sat Jun  4 22:37:58 2011
InstallationMedia: Xubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427)
ProcEnviron:
 LANGUAGE=en_GB:en
 PATH=(custom, user)
 LANG=en_GB.UTF-8
 SHELL=/bin/bash
SourcePackage: xfwm4
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: xfwm4 (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug natty

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https://bugs.launchpad.net/bugs/792929

Title:
  you cannot stop a program that makes lots of windows

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