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kN6Xnww6XIBJUhM0+2jxxjhpeFO2JJT1vuEh6LsgKSuy3wdZidzvyv7s0TmCwGxvloNwyWWYlQfE06achMXDMAl+CgSQpcuMuPGaXoWL2b9NIFTF2UueRS5MuIyEhvmuTlNvLaaCrVVs4AgDofRTMG32DDrZb+H7gVJQJ0U3iFl1ln7hKEYm19om+95dkZ8d/xCILtexZGYJqjDw3+qMqnEFSq5VDyymX9jqVcriz5ZYYhR/CmZ2Intsa3hgfOZtvPed9hYT8ZwKuJ/E= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2 Oct 2025, at 1:23, jane.chu@oracle.com wrote: > On 10/1/2025 7:04 PM, Zi Yan wrote: >> On 1 Oct 2025, at 20:38, Zi Yan wrote: >> >>> On 1 Oct 2025, at 19:58, jane.chu@oracle.com wrote: >>> >>>> Hi, Zi Yan, >>>> >>>> On 9/30/2025 9:51 PM, syzbot wrote: >>>>> Hello, >>>>> >>>>> syzbot has tested the proposed patch but the reproducer is still tr= iggering an issue: >>>>> lost connection to test machine >>>>> >>>>> >>>>> >>>>> Tested on: >>>>> >>>>> commit: d8795075 mm/huge_memory: do not change split_huge_p= age.. >>>>> git tree: https://github.com/x-y-z/linux-dev.git fix_split_pa= ge_min_order-for-kernelci >>>>> console output: https://syzkaller.appspot.com/x/log.txt?x=3D17ce96e= 2580000 >>>>> kernel config: https://syzkaller.appspot.com/x/.config?x=3D714d45b= 6135c308e >>>>> dashboard link: https://syzkaller.appspot.com/bug?extid=3De6367ea2f= dab6ed46056 >>>>> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f9= 09b7976-1~exp1~20250708183702.136), Debian LLD 20.1.8 >>>>> userspace arch: arm64 >>>>> >>>>> Note: no patches were applied. >>>>> >>>> >>> >>> Thank you for looking into this. >>> >>>> My hunch is that >>>> https://github.com/x-y-z/linux-dev.git fix_split_page_min_order-for-= kernelci >>>> alone is not enough. Perhaps on ARM64, the page cache pages of /dev= /nullb0 in >>> Yes, it only has the first patch, which fails a split if it cannot be= >>> split to the intended order (order-0 in this case). >>> >>> >>>> the test case are probably with min_order > 0, therefore THP split f= ails, as the console message show: >>>> [ 200.378989][T18221] Memory failure: 0x124d30: recovery action for= unsplit thp: Failed >>>> >>>> With lots of poisoned THP pages stuck in the page cache, OOM could t= rigger too soon. >>> >>> That is my understanding too. Thanks for the confirmation. >>> >>>> >>>> I think it's worth to try add the additional changes I suggested ear= lier - >>>> https://lore.kernel.org/lkml/7577871f-06be-492d-b6d7-8404d7a045e0@or= acle.com/ >>>> >>>> So that in the madvise HWPOISON cases, large huge pages are splitted= to smaller huge pages, and most of them remain usable in the page cache.= >>> >>> Yep, I am going to incorporate your suggestion as the second patch an= d make >>> syzbot check it again. >> >> >> > > There is a bug here, > > if (try_to_split_thp_page(p, new_order, false) || new_order) { > res =3D -EHWPOISON; > kill_procs_now(p, pfn, flags, folio); <--- > > If try_to_split_thp_page() succeeded on min_order, 'folio' should be re= taken: folio =3D page_folio(page) before moving on to kill_procs_now(). #syz test: https://github.com/x-y-z/linux-dev.git fix_split_page_min_orde= r_and_opt_memory_failure_v2-for-kernelci Best Regards, Yan, Zi