XDM_INSUFFICIENTDATA error indicates issue with application feeding incomplete frame to decoder for decoding. I don't see how it is related to Scaler/nsf links which come into picture after decoding. Are you sure you get the decode errors only after introducing these two links and exact same stream fed works fien without error without these links ?
If this is the case then issue is some memory corruption. Try disabling algLink processing and check if you still get decode errors.
The stats print is pretty trivial. Refer implementation of Vsys_printDetailedStatistics and Vsys_printBufferStatistics.
All it does is
if(gVcapModuleContext.sclrId[devId]!=SYSTEM_LINK_ID_INVALID)
{
System_linkControl(gVcapModuleContext.sclrId[devId],
SCLR_LINK_CMD_PRINT_STATISTICS,
NULL, 0, TRUE);
}
.1. Check linkId is not invalid/
2. Issue statistics print cmd.
You just have to populate the linkids correctly for all the links you use in your usecase file so that it is not invalid link id. Other option is to remove the INVALID LINK ID check and explicitly invoke PRINT_STATISTICS with correct link id you are using in your usecase.
If a specific link cmd doesn't return note down which link cmd is hanging. It indicates that particular link is hung.