[MPICH] Possible MPI_Unpack bug

[Avery Ching]

Hi,

I think there may be a possible problem with unpacking an indexed of an
indexed MPI_Datatype into a buffer.  I have attached a program that
displays this behavior.  I have tested this on both mpich2-1.0.3 and
mpich2-1.0.4 with identical results.  Please let me know if I am wrong
about the correct MPI behavior or you see different results on your own
machine.

Program output:

print_char_buf: mem_buf before unpack
_ _ _ _ _   _ _ _ _ _
_ _ _ _ _   _ _ _ _ _
_ _ _ _ _   _ _ _ _ _
_ _
print_char_buf: mem_buf after unpack
a _ b c _   _ _ _ d _
e f g _ h   i _ _ _ _
j _ k l m   _ n o p _
q r
print_char_buf: my version of the correct buffer
a _ b c _   _ _ _ d _
e f g _ h   i j _ k l
_ _ _ _ m   _ n o p _
q r


Thanks,

Avery
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