Haven't had a chance to investigate at all, but noticed on CI:
2024-06-07T16:58:25.6537546Z -- Found BLAS: /usr/lib/x86_64-linux-gnu/libopenblas.so
2024-06-07T16:58:25.6539546Z -- BLAS libs: /usr/lib/x86_64-linux-gnu/libopenblas.so
2024-06-07T16:58:25.7005768Z -- BLAS vendor is probably not OpenBLAS. Make sure it doesn't try to do multithreading that might conflict with Charm++ parallelism.
Haven't had a chance to investigate at all, but noticed on CI: