MaiscRecordcomplete error code -9

Hi  Everyone

I  am  implementing  a the following scenario

1>  Creating a Thread
2>  Inside that thread  I  am  initilaizing and Oening the   the  CMdaAudioInputstream

now  I  ahve  one function 

ReadFromMic()
{
  TRAPD(err,inputstream->ReadL(iBuffer));
}


This  gives a call to  MaiscBufferCopied() with  KErrNone
but immiediately after this   MaiscRecordComplete  is called
with  err -9 (KErrOverFlow)

So  I  have some  question

Y  this  MaiscRecordComplete  is  called also if  it is called  with   -9    will it  fill  the   iBuffer to its max length  and  will  there  be any loss  of data

With Regards