[MPICH] MPICH2 freezes at Send/Recv pair that it previously executed

[Christian Zemlin]

I am running a parallel simulation using MPICH2, and occasionally this simulation freezes in the middle of the execution, as far as I can tell at a point where two slave nodes exchange data. 
What I don't understand is that this happens although the Send/Recv pair is executed thousands of times without problems, and then it still freezes, as if the nodes cannot communicate.

Any ideas how I can solve or better understand what is going wrong?

Christian
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