/usr/share/octave/site/m/sundialsTB/idas/idm/ is in octave-sundials 2.5.0-3+b1.
This file is owned by root:root, with mode 0o755.
..
/usr/share/octave/site/m/sundialsTB/idas/idm/Contents.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_bjac.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_bjacB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_djac.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_djacB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_gcom.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_gcomB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_gloc.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_glocB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_jtv.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_jtvB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_monitor.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_monitorB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_options.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_pset.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_psetB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_psol.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_psolB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_res.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_resB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_resS.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_rhsQ.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_rhsQB.m
/usr/share/octave/site/m/sundialsTB/idas/idm/idm_root.m