My system sometimes crashes suddenly and reboots itself. It's random, browsing web, idling, checking mails, I couldn't find the trigger. This is the only log I could find about the crash
The only software thing to try would be making sure your CPU's microcode and BIOS/firmware is up to date.
But that's definitely pointing to a hardware issue otherwise. Could be PSU if you have somewhat unclean power here you are, it takes just a tiny dip to cause the CPU to miscompute and report a machine check error.
Did it start doing it after that or has it done it before that? Also did you update anything since?
If you didn't update your computer, changed nothing and it definitely started after the power outage then yes, clues definitely points towards the PSU.
It's really a process of elimination: if you had it before the power outage then it can't be the power outage. If it started after but you also installed a bunch of updates, now you have two potential things to blame.
Lol those cores are totally there for redundancy... Right? :P
I have an old itanium server that 'boots' with like 3/8 working cores... Unfortunately the hardware has some other unknown issues that panic Linux shortly after loading. Somehow the efi system seems to be stable...