To answer my own question above, I found these posts:
https://lkml.org/lkml/2018/1/8/81 .
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https://bugs.launchpad.net/bugs/1629509
Title:
Cannot mount overlay with upperdir on overlay
Commit link:
https://github.com/torvalds/linux/commit/76bc8e2843b66f8205026365966b49ec6da39ae7
Does anyone understand enough about "This does not work and does not
make sense." to log an upstream/kernel bug, to request a
fix/reconsideration? I wonder what broke in overlay-on-overlay.
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I switched to devicemapper as the storage driver.
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Title:
Cannot mount overlay with upperdir on overlay
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Any workaround found so far? (still affect kernel 4.9 [both host and
guest])
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Title:
Cannot mount overlay with upperdir on overlay
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** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Changed in: linux (Ubuntu Xenial)
Status: Incomplete => Confirmed
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Hmm, looking at the kernel source this seems intentional. See commit
76bc8e2843b66f8205026365966b49ec6da39ae7.
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Title:
Cannot mount overlay with
Yes, exists in 4.4.23-040423-generic as well.
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Title:
Cannot mount overlay with upperdir on overlay
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Would it be possible for you to test the latest upstream stable kernel?
Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the
latest v4.4 stable kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel
