Comment 6 for bug 2031912

Here is a shorter one:

$ cat > test.py << EOF
from h5py import File
from mpi4py import MPI

with File('/tmp/aaaa', 'w', driver='mpio', comm=MPI.COMM_WORLD) as f:
  print(f)
EOF

$ mpirun -n 2 python3 test.py

It's just not as reliable, sometimes it works hehe

All the process will stuck in a poll loop waiting for IO on a couple of sockets. The timeout is zero so all the process will eat the CPUs alive...