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If I'm reading the error right, it attempted to access a memory address in the 140 TB range and I'm assuming you don't have >140 TB of RAM. Not sure on how to fix it, I'd poke around for config items that might be the wrong type or might've gotten turned into a -1 or maybe had a decimal value get interpreted as hex.

what happened prior to this?

I don't think anything odd happened, but this system has been like this for as far our logs go back.

Remember sometimes devices get mapped to out there memory ranges so maybe if you had a device failure, though I'm not sure why etcd would be directly trying to talk to device memory.