F39 - OpenMPI seems to be broken

I upgraded to Fedora 39 and the open source application code_saturne I am working on is no longer capable of running in parallel with the OpenMPI library. No code changes have been made but just a recompilation on Fedora 39. I can see the various tasks running in the background but they do nothing. Also no error messages are generated and the code runs properly in serial mode.

I switched to the MPICH library and now the code runs properly as before. I think that something in broken in the OpenMPI library on Fedora 39.

This probably warrants a bug report to bugzilla.redhat.com

Yes, but since this is work for me and not fun I cannot wait the months it usually takes for a bug in Fedora to be fixed. I switched to Ubuntu 22.04.