Also, both versions of PETSc were built with ^hdf5 at 1.10.5 ^mpich at 3.3 %gcc at 8.3.0 so the error is most likely not from hdf5. -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.mcs.anl.gov/pipermail/petsc-users/attachments/20191011/0f3fa0f0/attachment.html>