******************* This email originates from outside Imperial. Do not click on links and attachments unless you recognise the sender. If you trust the sender, add them to your safe senders list https://spam.ic.ac.uk/SpamConsole/Senders.aspx to disable email stamping for this address. ******************* Hi there, We're trying to install nektar++ 5.6.0 from source on our HPC system and are having trouble passing two parallel tests: MultiRegions_Helmholtz2D_CG_P7_Modes_AllBCs_iter_ml_par3 MultiRegions_Helmholtz3D_CG_Hex_AllBCs_iter_ml_par3 In both cases they hang. Have tried openmpi, intelmpi and mvapich2. Attaching strace to the processes reveals a lot of polling and not much else. To simplify, I've reproduced this on a separate Rocky 8.10 system + EPEL packages and building against master (7b1aa23bb) in case it has already been fixed. openmpi is 4.1.1: git clone http://gitlab.nektar.info/nektar/nektar.git mkdir build cd build cmake -D NEKTAR_USE_MPI=ON ../nektar make -j24 ctest Are these tests known to be problematic, please? Thanks, Mark