[MPICH] debug flag

[Wei-keng Liao]

I have an MPI I/O application that runs fine up to 1000 processes, but 
failed when using 4000 processes. Parts of error message are
     ...
     Stack Trace:  ------------------------------
     #0  0x00000000002d46fe in ADIOI_Calc_my_req()
     #1  0x00000000002d2280 in ADIOI_GEN_WriteStridedColl()
     #2  0x00000000002a397c in MPIOI_File_write_all()
     #3  0x00000000002a3a4a in PMPI_File_write_all()
     #4  0x00000000002913a8 in pmpi_file_write_all_()
     could not find symbol for addr 0x73696e6966204f49
     aborting job:
     application called MPI_Abort(MPI_COMM_WORLD, 1) - process 1456
     ...

My question is what debug flags should I use for compiling and running in 
order to help find what exact location in function ADIOI_Calc_my_req() 
causes this error?

Wei-keng