Ok, I figured out the problem.
You're using the yakkety kernel, 4.8. In the Xenial 4.4 kernel, memory
hotplug auto-onlining is disabled; however in the 4.8 kernel, memory
hotplug auto-onlining is enabled, so disabling the udev rule with the
4.8 kernel does nothing - the kernel's already onlined the balloon
memory region.
Edit your /etc/default/grub.d/50-cloudimg-settings.cfg file to add a
kernel boot param "memhp_default_state=offline", e.g.:
--- /etc/default/grub.d/50-cloudimg-settings.cfg.orig 2017-03-21
17:52:26.604389516 +0000
+++ /etc/default/grub.d/50-cloudimg-settings.cfg 2017-03-21
17:52:46.564462247 +0000
@@ -8,7 +8,7 @@
GRUB_TIMEOUT=0
# Set the default commandline
-GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0"
+GRUB_CMDLINE_LINUX_DEFAULT="console=tty1 console=ttyS0
memhp_default_state=offline"
# Set the grub console type
GRUB_TERMINAL=console
Then, run:
$ sudo update-grub
make sure you see the new boot param in your grub.cfg, e.g.:
$ grep memhp_default_state /boot/grub/grub.cfg
linux /boot/vmlinuz-4.8.0-41-generic
root=UUID=765f00af-531a-44bc-a083-66143320d408 ro console=tty1 console=ttyS0
memhp_default_state=offline
Then reboot, and when it comes back up, check to make sure memory auto-onlining
is disabled now:
$ cat /sys/devices/system/memory/auto_online_blocks
offline
Note, you still need to disable the udev memory hotplug online rule, as
mentioned in previous comments.
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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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