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List-Unsubscribe: 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 trigg= ering an issue: >> lost connection to test machine >> >> >> >> Tested on: >> >> commit: d8795075 mm/huge_memory: do not change split_huge_page= =2E. >> 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=3D17ce96e258= 0000 >> kernel config: https://syzkaller.appspot.com/x/.config?x=3D714d45b613= 5c308e >> dashboard link: https://syzkaller.appspot.com/bug?extid=3De6367ea2fdab= 6ed46056 >> compiler: Debian clang version 20.1.8 (++20250708063551+0c9f909b= 7976-1~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-k= ernelci > alone is not enough. Perhaps on ARM64, the page cache pages of /dev/nu= llb0 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 fail= s, as the console message show: > [ 200.378989][T18221] Memory failure: 0x124d30: recovery action for un= split thp: Failed > > With lots of poisoned THP pages stuck in the page cache, OOM could trig= ger too soon. That is my understanding too. Thanks for the confirmation. > > I think it's worth to try add the additional changes I suggested earlie= r - > https://lore.kernel.org/lkml/7577871f-06be-492d-b6d7-8404d7a045e0@oracl= e.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 ma= ke syzbot check it again. Best Regards, Yan, Zi