It's not clear to me whether Kubernetes 1.10.0 had the buggy volume mount subpath (https://github.com/kubernetes/kubernetes/issues/61076). It was fixed around the time of the 1.10.0 release, but the 1.10.x release notes (https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG-1.10.md) have fixes for subpath mounting in versions up to 1.10.3. I'd suggest trying Kubernetes 1.10.5 (which is what we test in travis) and see if you still see the nginx crash loop.
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