Comment # 3 on bug 1073926 from Josef Reidinger

(In reply to Dorian Weimar from comment #2)
> > Does it happen always? I check logs and e.g. for software repositories I see
> > some actions like pressing buttons. And does it froze immediatelly when you
> > select module or later when doing something there?
> 
> It happens most of the time, and it is when a module is selected such as the
> ones I listed.  At that point, the system completely locks up and all I can
> do is force a shutdown by holding the power button.

So it is complete system lockup? you cannot switch to e.g. console with
ctrl+alt+f* ? or can you ssh to machine?

What we can try to identify problematic part is to call it with strace and
redirect output to file, which you will attach.

Something like 

strace -ff -o ~/yast.strace /sbin/yast2 bootloader

and then pack and attach all ~/yast.strace.* files

pack e.g. with 
tar cjf ~/yast.strace.tar.bz2 ~/yast.strace*