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DM8168 program report Exception after run about 2 hours

Hi 

   I have a program to decode 4 channels UXGA h.264 stream ,  after run about 2 hours ,report execption. why get the exception? What the problem in my program?

  first time execption message from console:

    ------------------------------------------------------------------

3862822:!!!SLAVE CORE [VPSS-M3] DOWN!!!
SystemLink_copySlaveCoreExceptionContext:120
mmap of [0xbe9e0000:36864]
mmap virt addresss:0x2ab28000
munmap of [0x2ab28000:36864]
SystemLink_copySlaveCoreExceptionContext:127
SystemLink_handleSlaveCoreException:149


3862848:!!!SLAVE CORE DOWN!!!.EXCEPTION INFO DUMP

!!HW EXCEPTION ACTIVE (0/1): [1]

!!EXCEPTION CORE NAME : [VPSS-M3]

!!EXCEPTION TASK NAME : []

!!EXCEPTION LOCATION : []

!!EXCEPTION INFO : [H/W EXCEPTION]

!!EXCEPTION CCS CRASH DUMP FORMAT FILE STORED @ ./CCS_CRASH_DUMP_VPSS-M3.txt
SystemLink_handleSlaveCoreException:154

-----------------------------------------------------------------------

second time execption message from console:

4014439:!!!SLAVE CORE [VIDEO-M3] DOWN!!!
SystemLink_copySlaveCoreExceptionContext:120
mmap of [0xbe9c0000:36864]
mmap virt addresss:0x2ab26000
munmap of [0x2ab26000:36864]
SystemLink_copySlaveCoreExceptionContext:127
SystemLink_handleSlaveCoreException:149


4014465:!!!SLAVE CORE DOWN!!!.EXCEPTION INFO DUMP

!!HW EXCEPTION ACTIVE (0/1): [1]

!!EXCEPTION CORE NAME : [VIDEO-M3]

!!EXCEPTION TASK NAME : []

!!EXCEPTION LOCATION : []

!!EXCEPTION INFO : [H/W EXCEPTION]

!!EXCEPTION CCS CRASH DUMP FORMAT FILE STORED @ ./CCS_CRASH_DUMP_VIDEO-M3.txt
SystemLink_handleSlaveCoreException:154