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Other page flags arriving here are > > not locked | uptodate. > > > > Git bisect says this is first bad patch (6.14 --> 6.15-rc1) > > 4996fc547f5b ("mm: let _folio_nr_pages overlay memcg_data in first tail page") > > > > Experimenting a bit with the patch, UN-defining NR_PAGES_IN_LARGE_FOLIO, > > avoids the problem. > > > > The way that patch is reusing memory in tail pages and the fact that it > > only fails in XFS (not ext4) suggests the XFS is depending on tail pages > > in a way that ext4 does not. > > IIRC, XFS supports large folios but ext4 does not. But I don't really > know how that interacts with DAX (if the same thing applies). Ordinary > XFS large folio tests seem to work just fine, so the question is what > DAX-specific is happening here. So with fsdax large-folios come from large-extents. I.e. you can have large fsdax folios regardless of whether the filesystem supports large folios for page-cache mappings. The dax unit tests have an easier time getting XFS to create large extents than ext4. > When we free large folios back to the buddy, we set "folio->_nr_pages = > 0", to make the "page->memcg_data" check in page_bad_reason() happy. > Also, just before the large folio split for ordinary large folios, we > set "folio->_nr_pages = 0". Ah, yes, that is definitely missing in the fsdax case.