[mpich-discuss] Bug reporting for some mpi/rma tests

Clément Foyer clement.foyer at gmail.com
Tue Jul 12 03:08:06 CDT 2016

Hi everyone,

I think I may have found some bugs in mpich tests for RMA operations.

First, in rma/lockcontention3.c.
When calling RMA operations, the different offsets are not taken in account
on the origin_count and target_count parameters. As the buffers are the
same sizes, when the count arguments are equal to "longcount" (such as in
the tests cases 9, 10 and 11), it either overflows when the operation is
actually done, or, as it should preferably be done, it fails with the
returns of the MPI_ERR_RMA_RANGE error code.
Also, on the check function, there are some array overflows, as the loops
go from 0 to longcount-1, and the array is accessed with the OFFSET
The easiest solution would be to set bufsize (l.111) and getbufsize (l.118)
to RMA_SIZE+OFFSET_3 (OFFSET_3 being the bigger one), and maybe allocate
change l.123 to srcbuf = malloc((RMA_SIZE + OFFSET_3)*sizeof(*srcbuf));
Also, the window is defined with the bufsize as size, which should mean
that the window is bufsize bytes long. But as it is an array of int's, it
would rather be bufsize*sizeof(int) long. There might be a problem there as
well, given the fact that the displacement unit given is actually

No verification is done. Just accumulate, and then we assume the result is
correct. Also, winbuf is not initialized.

Sincerely yours,

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