Good morning!
I was testing myself a particle in minecraft, running it on repeating_command_block to see how it looked, but when it came to the one called minecraft:conduit_attack_emitter, it first crashed and then shut down my PC. When I checked the cause, it turned out to be due to excessive CPU usage. it was so high that it made it impossible to use the PC, so I couldn't turn off the command block.
P.S. Besides the processor, the memory usage was increasing all the time, but I'm not able to show it, because it crashed my hardware and I didn't manage to take a screenshot.