There was only one commit that sticks out between 4.10-rc2 and
v4.10-rc3, it is kvm and s390 related:

cabab3f ("s390/kbuild: enable modversions for symbols exported from
asm")

I built a Xenial test kernel with a pick of this commit.  The test kernel can 
be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1735420/

Can you test this kernel and see if it resolves the bug?  If it does
not, we'll have to reverse bisect to identify the commit.

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https://bugs.launchpad.net/bugs/1735420

Title:
  Avoid creation of /dev/kvm in Xenial KVM virtual machines on s390x

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