The intel 19 compiler and newer apparently miscompile GRhydro’s HLLE code when MHD is enabled. This results in either a SEGFAULT of con2prim failures. This has been in the ET tests since around 2021 (it shows up in the ET_2021_05_v0 release tests).

Pull request
https://bitbucket.org/einsteintoolkit/einsteinevolve/pull-requests/18
provides a workaround. With it the affected tests pass, see eg qb an supermuc on http://einsteintoolkit.org/testsuite_results/index.php

--
Ticket URL: https://bitbucket.org/einsteintoolkit/tickets/issues/2668/grhydro-work-around-intel-19-compiler