Try updating to v6.11.0-rc4, if that doesn't help and IIRC a user with a similar error KVM error fixed it by creating as new identical VM, i.e., it was something in that specif VM.
Log shows many NMI events before the crash, and before those events are some WSD strange errors, WSD is known to some times cause high CPU usage, so I would starta with disabling that: Settings -> SMB Settings
According to the manual the slot is not shared, look for a BIOS update, it that doesn't help IMHO the best bet would be a different board (or controller).
Try connecting just the cache device on the board controller, it might be a compatibility issue, if the controller is based on the JMB585 chipset they usually work fine.
Num Test_Description Status Remaining LifeTime(hours) LBA_of_first_error
# 1 Extended offline Completed: read failure 30% 55735 6445056640
Test failed, disk should be replaced.