Hi Zika,
Are you running GS? I still am.
I accidentally booted into 3.18-rc1 this morning. I forgot to purge it.
Like a babe_in_the_woods, I went merrily on my way. Two hours later, my machine started acting janky -- then crashed. That's when I realized I had mistakenly booted into 3.18-rc1, while brewing a pot of coffee. LoL
Luckily, it didn't hard-lock this time. This allowed some useful info to be written to the log files.
Example: '/var/log/apport.log'
Code:
ERROR: apport (pid 9440) Thu Oct 23 09:14:12 2014: called for pid 2367, signal 5, core limit 0
ERROR: apport (pid 9440) Thu Oct 23 09:14:12 2014: executable: /usr/lib/gnome-settings-daemon/gnome-settings-daemon (command line "/usr/lib/gnome-settings-daemon/gnome-settings-daemon")
ERROR: apport (pid 9440) Thu Oct 23 09:14:14 2014: debug: session gdbus call: (true,)
ERROR: apport (pid 9440) Thu Oct 23 09:14:23 2014: wrote report /var/crash/_usr_lib_gnome-settings-daemon_gnome-settings-daemon.1000.crash
Odd one, yes?
Anyway, I'll do some forensics and see what else I discover. I'll report back, if I find anything remarkable.
BTW, I never had a single problem running 3.17.1-generic, yesterday, so the finger points to 3.18-rc1, in my mind.