Man pages matching name debugfs.reiser4 in section 8:

debugfs.reiser4.8.en	debian 10 / reiser4progs
debugfs.reiser4.8.fr	debian 11 / manpages-fr
debugfs.reiser4.8.en	debian 11 / reiser4progs
debugfs.reiser4.8.fr	debian 12 / manpages-fr
debugfs.reiser4.8.en	debian 12 / reiser4progs