After an update of my TrueNAS I started getting some strange double beeps. I thought it might be thermal warning, so I cleaned my NAS PC, put a monitor and keyboard on and booted it up.
I started to see some strange token series popping up, seemingly random: ^[[6~^ ^[[6~^.
I thought nothing of it.
Then more beeps, system froze. I checked the monitor. It was flooded with ^[[6~^ ^[[6~^.
I then rebooted my TrueNAS and went into the shell by pressing 9.
Now I see: ~~ and the same beeps occur when the characters appear. Roughly around every 8 seconds.
What is causing these? I tried unplugging all USB devices, I even tried to google. I found things like kbdcontrol, jons, crontab. But with my very limited Linux knowledge I could not make anything work.
Hoping someone can help me with this.
Something went wrong with the patching process (I guess)
How I fixed it:
In the GUI I went to System -> Boot
I reverted to the previous patch. Rebooted the system.
Issue still occurred.
Then I went to Dashboard -> check for updates.
It then went on and installed the update (as before).
Now the issue is resolved.