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 2wQIAMWu 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Tue, Jul 07, 2026 at 03:01:56PM +0100, Lorenzo Stoakes wrote: > +cc Balbir > > Thanks for the series! > > I think Balbir should be cc'd no? > Thanks, my linux-mm monitoring has been largely skimming through the list. Explict cc's are always appreciated. > On Tue, Jul 07, 2026 at 06:45:06AM -0700, Usama Arif wrote: > > Since commit 368076f52ebe ("mm/huge_memory: add device-private THP support > > to PMD operations") a PMD may hold a device-private swap entry whenever > > an HMM-based GPU driver migrates an anonymous THP folio to device memory > > via migrate_vma_pages(). > > > > pmd_trans_huge_lock() succeeds for such PMDs (pmd_is_huge() returns true > > for any non-present, non-none huge PMD), so several MM walk callbacks > > that used to assume present THP or migration entry are now reachable with > > a device-private PMD. The results range from a VM_BUG_ON() firing on debug > > kernels, to an oops on a bogus vmemmap dereference, to silently isolating > > an unrelated live folio from LRU in the aliasing case. > > > > The first 2 fixes were reported as pre-existing issues by sashiko in my > > PMD swap entry series [1]. Hopefully sashiko won't point these out > > in the next PMD swap entry series :) > > Yeah I don't love these 'existing problem' reports (distracting from other work, > add workload, really it feels like that should be a passive reporting mode for > sashiko not arbitrarily added to other series), but sending it as a separate > series is indeed the right way :) > > These of course should never block an unrelated series. > > > > > [1] https://sashiko.dev/#/patchset/20260703173903.3789516-1-usama.arif%40linux.dev?part=6 > > Hmm we've had a whole host of issues with device-private PMDs recently. > > Balbir - would it be possible to audit all of the code paths and proactively see > if there's anything else that could hit problems here? > Let me run through this and audit them. My usage of device private PMD did not expose them, but I can see a bunch of reports in the link above > > > > Usama Arif (3): > > mm/mempolicy: skip device-private PMDs when queueing folios > > mm/madvise: skip device-private PMDs in cold and pageout walks > > mm/huge_memory: skip device-private PMDs in madvise_free_huge_pmd > > > > mm/huge_memory.c | 3 +++ > > mm/madvise.c | 3 +++ > > mm/mempolicy.c | 2 ++ > > 3 files changed, 8 insertions(+) > > > > -- > > 2.53.0-Meta > > > Thanks Lorenzo! Balbir