There's a btrfs filesystem crashing, most likely the docker image, you should recreate it.
CPU is still overheating:
Mar 12 08:25:50 Valyria kernel: CPU6: Package temperature above threshold, cpu clock throttled (total events = 51)
Mar 12 08:25:50 Valyria kernel: CPU14: Package temperature above threshold, cpu clock throttled (total events = 51)
Mar 12 08:25:50 Valyria kernel: CPU8: Package temperature above threshold, cpu clock throttled (total events = 51)
Mar 12 08:25:50 Valyria kernel: CPU3: Package temperature above threshold, cpu clock throttled (total events = 51)
Mar 12 08:25:50 Valyria kernel: CPU11: Package temperature above threshold, cpu clock throttled (total events = 51)