First thanks for your explanations and help.
I would like to clarify one point: In my situation the time is frozen and delta cycles are not also counting up. Simulator doesnt respond to my pause command(I used both the pause button and ctrl+C).It only come out of its infinite run with multiple ctrl+Cs and that multiple ctrl+Cs are causing the simulator to terminate.
When I try to do line-by-line debugging very close to the hanging time, I lost the yellow arror(it gets grayed out) somewhere close to that hanging time and I can't know where is the last statement executed before entering that infinite loop.It could be somewhere in one of those c library.
If it was a delta cycle issue, it would be much and much more easy to debug as I can trace the code and see the feedback path, but now I can do simply nothing other then givin multiple ctrl+C commands end then let the simulator terminate.Therefore even if I enable a breakpoint of 1 delta cycles, simulator hangs before even a single delta cycle!!!!
By the way, +nbasync option couldn't solve the issue, but it chaned the hanging time point. When I recompile the same design at different times, it also changes the hanging time point as well.
How can I also check the compatibility of STIL DPV libraries, simulator and the compiler that I use for my .c files' compilation.