Bug#1127800: fenics-dolfinx autopkgtest timeout with the nanobind 2.11.0 rebuild

[Drew Parsons]

Source: fenics-dolfinx
Followup-For: Bug #1127800
X-Debbugs-Cc: 1127672 at bugs.debian.org

I'm confident now that Bugs #1127672 and #1127800 are triggered by the
same underlying issue.

I could clear out problems importing dolfinx on my local machine by
clearing the fenics cache
  rm -r ~/.cache/fenics/
  
After that I can reproduce issues with the same 5 tests found failing
on the 32-bit arches (with mpich) on my local machine (amd64 with
openmpi).

The difference is that serial tests (including mpirun -n 1) pass with
openmpi where they fail with mpich (#1127672)

The other difference is that nanobind with mpich triggers the
"incompatible function arguments" error reported in the 5 tests in
#1127672,
while with multiprocess openmpi (mpirun -n 2) the first test
(test_read_write_mixed_topology in test_vtkhdf.py) times out
(#1127800), so debci doesn't get to see the problem with the other 4
tests.