Description of problem: When I execute lsof on some systems, it doesn't report that certain file descriptors are sockets and what types of sockets (all are reported "unknown"), on others it works as expected. Version-Release number of selected component (if applicable): lsof-4.94.0-3.el9.x86_64 How reproducible: when it happens, it's fully reproducible, but not on all systems Steps to Reproduce: 1. provision machine in 1minutetip 2. ps aux | grep sshd 3. lsof -w -b -p $sshd_pid Actual results: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 3456 root cwd unknown / sshd 3456 root rtd unknown / sshd 3456 root txt unknown /usr/sbin/sshd sshd 3456 root mem REG 253,1 6753911 /usr/sbin/sshd sshd 3456 root mem REG 253,1 6522798 /usr/lib64/libnss_systemd.so.2 sshd 3456 root mem REG 253,1 6709939 /usr/lib64/libnss_sss.so.2 sshd 3456 root mem REG 253,1 4759913 /usr/lib64/security/pam_lastlog.so ... sshd 3456 root mem REG 253,1 6394687 /usr/lib64/ld-linux-x86-64.so.2 sshd 3456 root mem REG 0,20 19 /sys/fs/selinux/status sshd 3456 root 0 unknown /dev/null sshd 3456 root 1 unknown /dev/null sshd 3456 root 2 unknown /dev/null sshd 3456 root 3 unknown socket sshd 3456 root 4 unknown socket sshd 3456 root 5 unknown /dev/ptmx sshd 3456 root 6 unknown socket sshd 3456 root 7 unknown /run/systemd/sessions/3.ref sshd 3456 root 8 unknown socket Expected results: COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME sshd 6164 root cwd DIR 253,1 4096 2 / sshd 6164 root rtd DIR 253,1 4096 2 / sshd 6164 root txt REG 253,1 952568 3937467 /usr/sbin/sshd sshd 6164 root mem REG 253,1 6940392 1445554 /var/lib/sss/mc/group ... sshd 6164 root mem REG 253,1 135256 3995397 /usr/lib64/libaudit.so.1.0.0 sshd 6164 root mem REG 253,1 843032 3937850 /usr/lib64/ld-2.33.so sshd 6164 root 0r CHR 1,3 0t0 4 /dev/null sshd 6164 root 1u unix 0x0000000090427bf4 0t0 45521 type=STREAM (CONNECTED) sshd 6164 root 2u unix 0x0000000090427bf4 0t0 45521 type=STREAM (CONNECTED) sshd 6164 root 3r REG 253,1 9253600 1445549 /var/lib/sss/mc/passwd sshd 6164 root 4u unix 0x00000000967d618d 0t0 38647 type=STREAM (CONNECTED) sshd 6164 root 5u IPv4 45537 0t0 TCP *:ssh (LISTEN) sshd 6164 root 6r REG 253,1 6940392 1445554 /var/lib/sss/mc/group sshd 6164 root 7u IPv6 45539 0t0 TCP *:ssh (LISTEN) Additional info: