Bug#1145118: adios4dolfinx: FTBFS: E ValueError: [Sat Aug 22 10:11:38 2026] [ADIOS2 EXCEPTION] <Core> <IOHDF5> <MakeEngineHDF5> : A serial HDF5 engine cannot be used with a communicator that is MPI-based.

[Santiago Vila]

On Mon, Aug 31, 2026 at 11:22:49AM +0200, Drew Parsons wrote:
> Source: adios4dolfinx
> Followup-For: Bug #1145118
> Control: tags -1 ftbfs
> 
> This error makes no sense.  It's saying that adios2 is using serial
> HDF5, when MPI parallel HDF5 is needed.  That bit makes sense.
> What does not make sense is that it is
> adios2.bindings.adios2_bindings_mpi.ADIOS reporting this error,
> i.e. the MPI build is saying it's using the serial engine.
> 
> Looks like something's gone wrong in adios2.
> Perhaps they're not properly updated for HDF5 v2.

Note: Some hdf5-related bugs have fixed themselves recently without
doing anything in the package itself, which means the problem was
really in some build-dependency.

I'm retesting this one right now, and will close it if it works today.

(Normally I like to use debbisect to reassign the bug where it belongs,
but there are too many affected packages for that).

Thanks.