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 8R4mYbEY 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000032, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: * Linus Torvalds [230916 15:32]: > On Sat, 16 Sept 2023 at 04:43, Bagas Sanjaya wrote: > > > > Thanks for the regression report. Michael had already bisected it [1], so > > telling regzbot: > > > > #regzbot ^introduced: 408579cd627a15 > > #regzbot title: huge committed memory due to returning 0 on do_vmi_align_mmunmap() success > > > > [1]: https://lore.kernel.org/linux-parisc/30f16b4f-a2fa-fc42-fe6e-abad01c3f794@virtuozzo.com/ > > Funky. That commit isn't actually supposed to change anything, and the > only locking change was because it incorrectly ended up doing the > unlock a bit too early (before it did a validate_mm() - fixed in > commit b5641a5d8b8b ("mm: don't do validate_mm() unnecessarily and > without mmap locking"). > > HOWEVER. > > Now that I look at it again, I note this change in move_vma(). > > - if (do_vmi_munmap(&vmi, mm, old_addr, old_len, uf_unmap, false) < 0) { > + if (!do_vmi_munmap(&vmi, mm, old_addr, old_len, uf_unmap, false)) { > > and I think that is wrong. > > The return value that changed was the old "return 1 if successful > _and_ lock downgraded". > > Now it does "lock is always released on success if requested". So the > special "1" return went away, but the failure case didn't change. > > So that change to "move_vma()" seems to be bogus. It used to do "if > failed". Now it does "if success". > > Does the attached patch fix the problem? > > Liam - or am I just crazy? That return value check change really looks > bogus to me, but it looks *so* bogus that it makes me think I'm > missing something. You are correct. I should not have changed that check. I haven't devised a way to check this on parisc (I finally have a qemu parisc vm booting), but it should happen on any call to move_vma(). It looks like you have a tester though, so I'll return to dinner. Thanks, Liam