bug in message length when postponing BufferingPostbox send due to reentrancy
bug in message length when postponing BufferingPostbox send due to reentrancy

TimelyDataflow/Naiad,xinhaoyuan/Naiad,TimelyDataflow/Naiad,ms705/Naiad,ms705/Naiad,MicrosoftResearch/Naiad,xinhaoyuan/Naiad,MicrosoftResearch/Naiad