/usr/lib/x86_64-linux-gnu/ is in libproc-processtable-perl 0.53-1build1.
This file is owned by root:root, with mode 0o755.
..
/usr/lib/x86_64-linux-gnu/perl5/
/usr/lib/x86_64-linux-gnu/perl5/5.22/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/Killfam.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/ProcessTable/
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/ProcessTable/Process.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/ProcessTable.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/Proc/Killall.pm
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Proc/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Proc/ProcessTable/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Proc/ProcessTable/ProcessTable.so
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Proc/ProcessTable/Process/
/usr/lib/x86_64-linux-gnu/perl5/5.22/auto/Proc/ProcessTable/Process/autosplit.ix