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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. > 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 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. 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. thanks, -jane