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zuVF6V4M1WyEBSKXD1g1WtThCADXudHcgPg+ooXGP36gzftdatQTDdUQuA2Hmg0h6g1J7tuDWxe1CEiLMtMvN9CbPKJLWxgvACGXo9m/4TQDqs3SJeyJrg== 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 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 triggering an issue: >>>> lost connection to test machine >>>> >>>> >>>> >>>> Tested on: >>>> >>>> commit: d8795075 mm/huge_memory: do not change split_huge_page.. >>>> git tree: https://github.com/x-y-z/linux-dev.git fix_split_page_min_order-for-kernelci >>>> console output: https://syzkaller.appspot.com/x/log.txt?x=17ce96e2580000 >>>> kernel config: https://syzkaller.appspot.com/x/.config?x=714d45b6135c308e >>>> dashboard link: https://syzkaller.appspot.com/bug?extid=e6367ea2fdab6ed46056 >>>> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b7976-1~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 fails, 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 trigger too soon. >> >> That is my understanding too. Thanks for the confirmation. >> >>> >>> I think it's worth to try add the additional changes I suggested earlier - >>> https://lore.kernel.org/lkml/7577871f-06be-492d-b6d7-8404d7a045e0@oracle.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 and make >> syzbot check it again. > > > #syz test: https://github.com/x-y-z/linux-dev.git fix_split_page_min_order_and_opt_memory_failure-for-kernelci > There is a bug here, if (try_to_split_thp_page(p, new_order, false) || new_order) { res = -EHWPOISON; kill_procs_now(p, pfn, flags, folio); <--- If try_to_split_thp_page() succeeded on min_order, 'folio' should be retaken: folio = page_folio(page) before moving on to kill_procs_now(). thanks, -jane > > -- > Best Regards, > Yan, Zi