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List-Unsubscribe: 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 trig= gering an issue: >>> lost connection to test machine >>> >>> >>> >>> Tested on: >>> >>> commit: d8795075 mm/huge_memory: do not change split_huge_pag= e.. >>> 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=3D17ce96e25= 80000 >>> kernel config: https://syzkaller.appspot.com/x/.config?x=3D714d45b61= 35c308e >>> dashboard link: https://syzkaller.appspot.com/bug?extid=3De6367ea2fda= b6ed46056 >>> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909= b7976-1~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-ke= rnelci >> alone is not enough. Perhaps on ARM64, the page cache pages of /dev/n= ullb0 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 fai= ls, as the console message show: >> [ 200.378989][T18221] Memory failure: 0x124d30: recovery action for u= nsplit thp: Failed >> >> With lots of poisoned THP pages stuck in the page cache, OOM could tri= gger too soon. > > That is my understanding too. Thanks for the confirmation. > >> >> I think it's worth to try add the additional changes I suggested earli= er - >> https://lore.kernel.org/lkml/7577871f-06be-492d-b6d7-8404d7a045e0@orac= le.com/ >> >> So that in the madvise HWPOISON cases, large huge pages are splitted t= o 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_orde= r_and_opt_memory_failure-for-kernelci -- Best Regards, Yan, Zi