/usr/lib/x86_64-linux-gnu/ is in liblinux-fd-perl 0.011-1build3.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.26/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/FD/
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/FD/Event.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/FD/Signal.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/FD/Timer.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/Linux/FD.pm
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Linux/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Linux/FD/
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Linux/FD/FD.bs
/usr/lib/x86_64-linux-gnu/perl5/5.26/auto/Linux/FD/FD.so