[Bug]: pgrep reporting PIDs that do not exist sometimes and causes server crash when monitoring enabled.

[Kr3m]

User story

when monitoring is enabled, the server crashes.

Game

Quake 3

Linux distro

Ubuntu 22.04

Command

command: monitor

Further information

When server monitoring is enabled, sometimes it fails and sends a soft quit to the server.

Oct 18 05:00:23.812 q3server: MONITOR: ERROR: Checking session: ERROR
Oct 18 05:00:23.955 q3server: MONITOR: ERROR: Checking session: PIDS with old type tmux session are running
Oct 18 05:00:24.162 q3server: MONITOR: ERROR: Checking session: Killing session with the session name q3server
Oct 18 05:00:32.936 q3server: STOP: INFO: Graceful: sending "quit"
Oct 18 05:00:34.450 q3server: STOP: PASS: Graceful: sending "quit": OK: 1 seconds```

### Relevant log output

_No response_

### Steps to reproduce

Enable server monitoring in cron jobs for q3server or qlserver

[dgibbs64]

a reboot of the server should resolve this issue if lingering.

[Kr3m]

This still seems to be an issue. I have monitoring disabled for now.

[tk1114632]

I think I have the same issue with cs2server. issue