I don't know what is that, but after the recent "apt-get update; apt-get upgrade; apt-get dist-upgrade" operation, the system will randomly freeze.> uname -a
Linux PC-686 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt25-1 (2016-03-06) x86_64 GNU/Linux
Looks it happens randomly (no rules at all). Sometimes when I use iceweasel and sometimes when I use mate-system-monitor.
The hardware is fresh, so I think that maybe is potential bug.