ORPort []:9050
This config line will probably cause a parse error.
If this is meant to be an IPv6 ORPort, try:
ORPort [::]:9050
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Indeed, ORPort []:9050 is incorrect, even it's not the reason of the error described in this message.
Sorry for the confusion I had removed the ipv6 address before sending the email. But it would be ORPort [ipv6_address]:9050
Back to the err message: I see you use two Tor instances and properly set up two different datadirectories for each, one in /var/lib/tor/data and one in /var/lib/tor2/data -- so the possibility of two (Tor) processes running in the same datadirectory shouldn't be of concern.
Please follow-up this bug, maybe downgrade your logs to at least info level and monitor the processes running and using the Tor DataDirectory paths.
I have been using nyx to monitor the relay process via "sudo -u tor nyx" I will stop using it for the time being and just monitor the files.
Already crashed twice so far? Which instance crashed the one running a relay or the one hosting onion services?
The relay has crashed twice, the one hosting the onion service has been unaffected.