futex_wait user-space locking does not work properly

Dear all,
I beg your pardon if this question is out of the current forum theme. I need help with periodical freezing the computer because of "quick user-space blocking". It just hangs in futex_wait state and does not react on any my actions, I even can't leave the KDE desktop by Ctr-Alt-F1 (F2, F3, etc.) button. Computer is just happy with itself communicating with own HDD and that's all. Is it possible to tune up the system to avoid usage of "quick user-space blocking" action?

uname -a output:
Linux linux-zlw7.site 3.11.10-17-desktop #1 SMP PREEMPT Mon Jun 16 15:28:13 UTC 2014 (fba7c1f) i686 athlon i386 GNU/Linux
System is: openSUSE 13.11.10-17 (Bottle).
KDE version: 4.11.5.
System is up to date, all latest updates are applied.

Thanks in advance,
Dmitry