while viewing streaming video and closing Firefox window, PC got stuck and hard drive got crazy

hi, i was watching a tv program as streaming (http://peer-stream.com/api/embedplayer/?id=france2&e=1&width=520&height=360). I wanted to close the firefox window of the video, and then the hard drive started to run like crazy, i could hardly move the mouse on the screen and i had to shutdown. In the log thereafter, i saw what is displayed in the attachment ("please report this problem to ALSA developpers" in french in the log file with 2 errors in snd_pcm_avail() and snd_pcm_delay()).
That is what I do acually :).
My information are tiny, sorry about that and hope this helps a bit.
Good luck :)

Olivier.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: ubuntu-release-upgrader-core 1:0.205.2
ProcVersionSignature: Ubuntu 3.11.0-12.19-generic 3.11.3
Uname: Linux 3.11.0-12-generic x86_64
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
CrashDB: ubuntu
Date: Fri Nov 8 21:47:27 2013
InstallationDate: Installed on 2013-11-07 (1 days ago)
InstallationMedia: Kubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: ubuntu-release-upgrader
Symptom: dist-upgrade
UpgradeStatus: No upgrade log present (probably fresh install)