Arch Linux

Description:
Binary gets stuck at MPI_File_open call when executed twice in a row.

Additional info:
* openmpi 4.1.5-3
* Downgrading system to Aug 02 2023 (where openmpi is 4.1.5-2) "solves" the issue

Steps to reproduce:

1. Create a dummy file called `test-file.txt`.

2. Copy minimal code in `test.c` file:
```
// Based on minimal code for bug report: https://bugs.archlinux.org/task/78786?project=1&string=openmpi
#include <stdio.h>
#include <mpi.h>

int main() {
int rank;
MPI_Init(NULL, NULL);
MPI_Comm comm = MPI_COMM_WORLD;
MPI_Comm_rank(comm, &rank);

MPI_File fh;
int err = MPI_File_open(comm, "test-file.txt", MPI_MODE_RDONLY, MPI_INFO_NULL, &fh);
if (err != MPI_SUCCESS) {
printf("Got error trying to open file\n");
}

printf("Hello, I am rank %d in the merged comm\n", rank);
MPI_Barrier(comm);

MPI_Finalize();
return 0;
}
```

3. Compile code `gcc test.c -lmpi`.

4. Run code twice: `mpirun -np 2 a.out && mpirun -np 2 a.out`

The expected output (order does not matter) is
```
Hello, I am rank 0 in the merged comm
Hello, I am rank 1 in the merged comm
Hello, I am rank 0 in the merged comm
Hello, I am rank 1 in the merged comm
``

Sadly, my output is only the first two lines. It gets stuck without printing the other two lines. Debugging using gdb confirms that it is stuck somewhere in the MPI_File_open call.