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change layout link error

hi all ,now my osd link is after swms .when i alloc a osd window with width*height is 120*120,the osd content can display normally,but when i change the layout then it wil have the following error,but if i alloc the buffersize with the width*heigh is 48*48 ,that  will be normal.and  the format is SYSTEM_DF_RGB24_888,so why? 

SYSTEM: Invalid proc ID ( procID = 15, linkID = 0xf8070000, cmd = 0x00008001)
ASSERT (system_linkApi.c|System_linkControl|42)