Hi mpich team,

I am using MPICH 3.0.4 sock with dynamic connection (accept/connect).

I am facing issues with the following scenario, when there is a race condition in MPI_Comm_connect.

Here is the case

1> Server opens a port, writes the port info in a file, calls MPI_Comm_accept

2> Client1 & Client2 reads the port information from file and each client calls MPI_Comm_connect

3> Server accepts one client, disconnects, closes the port, exit

4> One of the client successfully connects, disconnects, exit

5> The other client hangs in MPI_Comm_connect

If you do the following steps, you can reproduce the issue

1> Please set compiler and installation path of MPICH in makefile

2> make : compiles

3> make run_bad

I have noticed that in case client calls MPI_Comm_connect after the port is closed, the connect calls successfully terminates with error (make run_good).

Please let me know whether it is a bug or not.

Please also let me know if the connect call can be configured with a timeout or not.

Thanks,

Hirak