Alex,
These messages seems to be a hardware failure, we could try booting the switch from an alternate partition and see if it helps.
Please click on the below mentioned Article to see the steps for booting the switch from an alternate partition:-
https://gtacknowledge.extremenetworks.com/articles/Solution/PANIC-Unexpected-General-exception
In case, if its not helping you to recover the switch, we would need to RMA the switch. Open a case with our TAC team along with the session logs.
Note:- I don't think, we would be able to recover the switch configuration. The above article only helps you to recover the switch. In case, if you have an old show tech or a working configuration file, we could copy paste the configuration to the switch, once it is recovered.
Regards,
Sumeesh