Application freeze escalates until whole system locks up

Bug #1211283 reported by halfbeing
6
This bug affects 1 person
Affects Status Importance Assigned to Milestone
linux-meta-lowlatency (Ubuntu)
New
Undecided
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Bug Description

Twice today my machine has locked up in the same way and in the same circumstances. In both cases it started with Firefox freezing. At this point I could still switch between windows move windows around the desktop. However when I clicked the X in the corner to close the Firefox window, the desktop became completely unresponsive. I could still move the mouse pointer around, but I couldn't click on anything.

I could also switch to another virtual console using ctrl-alt-F1 etc. In the virtual console I could type my name at the prompt and press enter, but apart from the cursor moving down a line, nothing would happen. After a while I got 9 or so messages on the console of the form "INFO: task mount.ntfs:2725 blocked for more than 120 seconds", followed by ""echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message". The other messages related to: firefox, Socket Thread, DNS Res~ver (3 times), cron, xfwm4 and getty.

Apart from these messages nothing else changed for the several minutes until I forced a shutdown. I could return the console cursor to the next line, I could switch between terminals and I could move the mouse pointer about, but I couldn't do anything else.

In case it is relevant, the NTFS activity that was fairly heavy, it being a system backup to external disk using Deja Dup.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: linux-image-lowlatency 3.8.0.27.15
ProcVersionSignature: Ubuntu 3.8.0-27.19-lowlatency 3.8.13.4
Uname: Linux 3.8.0-27-lowlatency i686
ApportVersion: 2.9.2-0ubuntu8.3
Architecture: i386
Date: Mon Aug 12 13:25:06 2013
EcryptfsInUse: Yes
InstallationDate: Installed on 2013-08-05 (6 days ago)
InstallationMedia: Ubuntu-Studio 13.04 "Raring Ringtail" - Release i386 (20130424)
MarkForUpload: True
SourcePackage: linux-meta-lowlatency
UpgradeStatus: No upgrade log present (probably fresh install)

Revision history for this message
halfbeing (halfbeing) wrote :
Revision history for this message
halfbeing (halfbeing) wrote :

The problem has occurred a third time and I have noticed another detail. When I move the mouse pointer around and hover it over the edge of a window, it changes to the resize pointer. However everything else about the screen is stuck. For instance the animation in my Fish the Fish applet remains frozen.

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