[MPICH] Error using MPI_WAITALL

[Vadivelan Ranjith]

 Hi 
  I am using mpich2-1.0.3 to compiling our code. Our code is calling   
  MPI_WAITALL. We ran the case in intel-Dual core without any problem   
  and solution was fine. I tried to ran the code in intel quad-core.   
  Compilation using mpif90 is fine. I started running the executable   
  file, i got the following error. 
  ------------------------------------------------------------------------------------------------------- 
  Fatal error in MPI_Waitall: Invalid MPI_Request, error stack: 
  MPI_Waitall(241): MPI_Waitall(count=250, req_array=0x23e52e0,   
  status_array=0x7fbfffe3a0) failed 
  MPI_Waitall(109): Invalid MPI_Request 
 ----------------------------------------------------------------------------------------------------------------------- 
  
  So i removed all the lines where MPI-WAITALL is using. Again i   
  compiled to code using mpif90(mpich) and ran it. Now its running   
  without any problem. Can you please explain me what is happen here. 
  
  Thanks 
  Velan
 				
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