Can this be due to request corruption? Do you have a simple checksum on requests? Probably not ...

struct ClientReadRequest {
   kXR_char  streamid[2];
   kXR_unt16 requestid;
   kXR_char fhandle[4];
   kXR_int64 offset;
   kXR_int32 rlen;
   kXR_int32  dlen;
};

If rlen is negative it get's added via:

// If we are monitoring, insert a read entry                                                                                                                                                          
//                                                                                                                                                                                                    
   if (Monitor.InOut())
      Monitor.Agent->Add_rd(myFile->Stats.FileID, Request.read.rlen,
                                                  Request.read.offset);


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