On Sat,  3 Mar 2018 01:12:26 +0100 Daniel Vacek <ne...@redhat.com> wrote:

> Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns
> where possible") introduced a bug where move_freepages() triggers a
> VM_BUG_ON() on uninitialized page structure due to pageblock alignment.

b92df1de5d28 was merged a year ago.  Can you suggest why this hasn't
been reported before now?

This makes me wonder whether a -stable backport is really needed...

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