[Bug]: Failures in HDF5Write_test

Description

The HDF5Write_test unit test is currently failing with segmentation violations:

2026-Jun-25 11:53:43,106 ERROR [static void ers::ErrorHandler::SignalHandler::action(int, siginfo_t*, void*) at /tmp/root/spack-stage/spack-stage-ers-NB_DEV_260625_A9-qimn5nong7ycomi2ldzkm47tzf2slyky/spack-src/src/ErrorHandler.cpp:101] Got signal 11 Segmentation fault (invalid memory reference)
        Parameters = 'name=Segmentation fault (invalid memory reference)' 'signum=11' 
        Qualifiers = 'unknown' 
        host = daq.fnal.gov
        user = amogan (52279)
        process id = 4073458
        thread id = 4073458

Steps to reproduce

In a fresh shell on daq.fnal.gov,

source /cvmfs/dunedaq.opensciencegrid.org/setup_dunedaq.sh
setup_dbt latest
dbt-create -n last_fddaq dev
cd dev && source env.sh
cd sourcecode
git clone https://github.com/DUNE-DAQ/dfmodules
dbt-build --unittest dfmodules

Version and environment

This appears to be only from the latest nightly. This did not happen during the nightly unit tests two days ago.

$ dbt-info release
Release type: fddaq
Release name: NFD_DEV_260625_A9
Base release name: NB_DEV_260625_A9
Release dir: /cvmfs/dunedaq-development.opensciencegrid.org/nightly/NFD_DEV_260625_A9

Impact

Small/Isolated

Anything else?

No response

Reproduce HDF5Write_test from a fresh shell on daq.fnal.gov using the listed setup_dunedaq, setup_dbt, dbt-create, clone, and dbt-build commands. Begin by confirming the failure in the NFD_DEV_260625_A9 nightly environment; done means the unit test no longer segfaults and the dfmodules unit-test build completes successfully.