Some games freeze my system completely

Since just few revisions, emulator freeze completely my system when running some games, without any error.
I believe it might be due to some work on rsx lately.
Here is example log. The log on screen stops at usual points, system becomes unresponsive does not react on any input, but log writes to file rpcs3.log anyway. Usually, system freezes when it appears:

Code:

RSX: ! {RSXThread} Add program (1):
RSX: ! {RSXThread} *** prog id = 5
RSX: ! {RSXThread} *** vp id = 2
RSX: ! {RSXThread} *** fp id = 4
RSX: ! {RSXThread} *** vp data size = 3008
RSX: ! {RSXThread} *** fp data size = 16
RSX: ! {RSXThread} *** vp shader =

or rarely

Code:

..............
..............
void main()
{
    h2 = diff_color;
    r0 = h2;
    r2 = h2;
    r3 = h2;
    r4 = h2;
    ocol0 = r0;
    ocol1 = r2;
    ocol2 = r3;
    ocol3 = r4;

Wonder where is the problem.