/usr/lib/x86_64-linux-gnu/libpfm.so.4 is in libpfm4 4.4.0+git47-g71166e2-1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/lib/x86_64-linux-gnu/libpfm.so.4.4.0
/usr/lib/x86_64-linux-gnu/libpfm.so.4.4.0