Bug 2063956

Summary: lsof loses ability to resolve protocol types in certain environments (unknown protocol for IPv4 sockets)
Product: Red Hat Enterprise Linux 9 Reporter: Hubert Kario <hkario>
Component: lsofAssignee: Jan Rybar <jrybar>
Status: NEW --- QA Contact: qe-baseos-daemons
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 9.0   
Target Milestone: rc   
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Hardware: Unspecified   
OS: Unspecified   
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Description Hubert Kario 2022-03-14 17:44:16 UTC 
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: