[Bug libc/30789] [2.38 Regression] sem_open will fail on multithreaded scenarios when semaphore file doesn't exist (O_CREAT)

["sergiodj at sergiodj dot net" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30789

--- Comment #1 from Sergio Durigan Junior <sergiodj at sergiodj dot net> ---
The bug can be reproduced in Ubuntu Mantic (development version).  Here are the
steps:

As root:

# apt update
# apt install -y mpi-default-bin python3-h5py-mpi

As a regular user:

$ 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

You will notice that the mpirun process hangs indefinitely and consumes 100% of
two CPUs.

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