Public bug reported: As per this bug report: https://bugs.freedesktop.org/show_bug.cgi?id=72569 there's a bug in LibreOffice that causes it to stop responding in certain reproducible situations. The relevant thing here is that the WHOLE SYSTEM stops responding and you can't even switch window, open a terminal, or close the offending application, in this case Libre OFfice.
If a single buggy (or even malicious) application can cause the whole system to become unusable, there is a bug in the system itself. I can switch to a virtual console with ctrl+alt+f1 and kill the offending libreOffice process in this case, so I guess the issue is somewhere between Unity and X, rather than in linux. But this is only a guess. ProblemType: Bug DistroRelease: Ubuntu 13.04 Package: unity 7.0.0daily13.06.19~13.04-0ubuntu1 ProcVersionSignature: Ubuntu 3.8.0-33.48-generic 3.8.13.11 Uname: Linux 3.8.0-33-generic x86_64 ApportVersion: 2.9.2-0ubuntu8.5 Architecture: amd64 CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins' Date: Tue Dec 10 17:38:35 2013 InstallationDate: Installed on 2013-10-11 (59 days ago) InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424) MarkForUpload: True SourcePackage: unity UpgradeStatus: No upgrade log present (probably fresh install) ** Affects: unity (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug raring -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1259625 Title: Whole system stops responding because of a single buggy application To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1259625/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs