Comment 3 for bug 1304001

Munehisa Kamata (https://launchpad.net/~kamatam) took at a look at this from our side and he believes that

"the following commit has introduced this. It is in Linux kernel 3.13 or later, and I've confirmed that kernel 3.14 still shows the same symptom.

http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/xen/balloon.c?id=c275a57f5ec3056f732843b11659d892235faff7

Looking at the change, only HVM will exhibit this. Also, it seems that this can only happen on c3.large and m3.medium, they have < 4GB of memory. The following discussion may be related to this, but I'm not sure if it is.

http://lists.xen.org/archives/html/xen-devel/2014-01/msg01524.html"