On Mon, 2017-08-21 at 17:45 +0200, pramod kumbhar wrote:

Dear All,

In one of our application I am seeing following error while using collective call MPI_File_write_all :

Error in ADIOI_Calc_aggregator(): rank_index(1) >= fd->hints-

...

cb_nodes (1) fd_size=102486061 off=102486469

Non collective version works fine.

While looking at callstack I came across below comment in mpich- 3.2/src/mpi/romio/adio/common/ad_aggregate.c :

/* we index into fd_end with rank_index, and fd_end was allocated to be no * bigger than fd->hins->cb_nodes. If we ever violate that, we're * overrunning arrays. Obviously, we should never ever hit this abort */ if (rank_index >= fd->hints->cb_nodes || rank_index < 0) { FPRINTF(stderr, "Error in ADIOI_Calc_aggregator(): rank_index(%d) >= fd->hints->cb_nodes (%d) fd_size=%lld off=%lld\n", rank_index,fd->hints->cb_nodes,fd_size,off); MPI_Abort(MPI_COMM_WORLD, 1); }

I am going to look into application and see if there is an issue with offset overflow. But looking at above comment ("Obviously, we should never ever hit this abort ") I thought should ask if there is any obvious thing I am missing.

that's my comment. The 'rank_index' array is allocated based on the 'cb_nodes' hint. I definitely would like to know more about how the code is manipulating rank_index, cb_nodes, and fd_end . If there is a reduced test case you can send me, that will be a huge help. ==rob

Regards, Pramod

p.s. I will provide reproducer after looking into this more carefully. _______________________________________________ discuss mailing list [email protected] To manage subscription options or unsubscribe: https://lists.mpich.org/mailman/listinfo/discuss

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