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    SubjectRe: [PATCH 0/7] HWPoison: Refactor get page interface
    On Wed, Dec 02, 2020 at 08:34:57AM -0500, Qian Cai wrote:
    > On Thu, 2020-11-19 at 11:57 +0100, Oscar Salvador wrote:
    > > Hi,
    > >
    > > following up on previous fix-ups an refactors, this patchset simplifies
    > > the get page interface and removes the MF_COUNT_INCREASED trick we have
    > > for soft offline.
    >
    > Well, the madvise() EIO is back. I don't understand why we can't test it on a
    > NUMA system before posting this over and over again.
    >
    > # git clone https://e.coding.net/cailca/linux/mm
    > # cd mm; make
    > # ./ranbug 1
    > - start: migrate_huge_offline
    > - use NUMA nodes 0,3.
    > - mmap and free 8388608 bytes hugepages on node 0
    > - mmap and free 8388608 bytes hugepages on node 3
    > madvise: Input/output error

    I tried it out myself enlarging the window race artificially but I was not able
    to get -EIO anymore.
    But as Vlastimil pointed out in the respective patch, it is better to keep the
    page pinned for madvise.

    I am planning to re-post leaving out the patches that remove the pinning.

    Anyway, thanks for the report.

    --
    Oscar Salvador
    SUSE L3

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