The dsp hung when calling VIDDEC_process() from arm side sometimes

Hi, all,

     Now i use DM6441 for video process, and meet one serious problem: the dsp hung when calling VIDDEC_process() from arm side sometimes. more detailed information and testing results are as follow:

     1) when the problem occured,   the problem always existed even if i reset the DM6441 SOC and reloaded *.x64P to run.

     2) if i comment some code in my codecs, the problem don't occur again. but the commented code is very simple and i can make sure that they are correct.

     3) when VIDDEC_process() is hung,  the call could return from dsp side after a very log time(e.g 4hours, 6hours, even more).

     i have several questions:

     A)  generally, what reason can hang the dsp except the codecs code meet infinite loop?

     B)  how to debug this problem?

     any help and sugguestion are appreciated.