> Excellent. Sanity check here: This also means that trusty is not affected
> because the udev
> rules don't match.
...
> in xenial...
> and includes ATTR{[dmi/id]sys_vendor}=="Xen", GOTO="vm_hotadd_apply" which
> does trigger the bug.
that's correct, on 14.04 the Xen balloon memory is not switched online
because the rule doesn't match on Xen systems, as you pointed out. In
an AWS instance, commenting out the memory hotadd udev rule in 16.04
changes its behavior (re: memory hotadd) to match 14.04, which works
around the bug.
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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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