$ grep 0 /sys/devices/system/memory/memory*/online
/sys/devices/system/memory/memory504/online:0


$ grep memory /lib/udev/rules.d/* /etc/udev/rules.d/*
/lib/udev/rules.d/40-vm-hotadd.rules:# On Hyper-V and Xen Virtual Machines we 
want to add memory and cpus as soon as they appear
/lib/udev/rules.d/40-vm-hotadd.rules:#SUBSYSTEM=="memory", ACTION=="add", 
DEVPATH=="/devices/system/memory/memory[0-9]*", TEST=="state", 
ATTR{state}="online"

I ran update-initramfs and rebooted again, but was still able to
reproduce the error with dd

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https://bugs.launchpad.net/bugs/1668129

Title:
  Amazon I3 Instance Buffer I/O error on dev nvme0n1

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