One of the processes started by mpirun has exited with a nonzero exit
code. This typically indicates that the process finished in error.
If your process did not finish in error, be sure to include a "return
0" or "exit(0)" in your C code before exiting the application.

PID 13373 failed on node n0 (1**.1**.**.10) due to signal 9.

とエラーが出ます。

パック、アンパックを利用して、何度も送受信出来ているんですけど、
５０００回程度繰り返したところでエラーがでます。

考えれる原因などありますか？