In case anyone is looking for a (sort of) workaround: a separate non-LVM
boot partition (/boot as mountpoint) circumvents the problem.
I'm not sure how easy this is to set up on an existing system. I had the
luxury of being able to do a clean install without much trouble. Of
course, this "workaround" is a bit heavy-handed, and should not be
necessary at all, as grub2 supports booting from LVM. But at least it
allows having the rest of the root filesystem on LVM volume(s).
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LVM-based filesystem does not boot with kernel 4.4 (but works with
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