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    SubjectRe: [PATCH 3.16 327/346] mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()
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    On Mon, 2016-11-14 at 10:42 -0500, Johannes Weiner wrote:
    > On Mon, Nov 14, 2016 at 12:14:20AM +0000, Ben Hutchings wrote:
    > > 3.16.39-rc1 review patch.  If anyone has any objections, please let me know.
    > >
    > > ------------------
    > >
    > > From: Johannes Weiner <hannes@cmpxchg.org>
    > >
    > > commit 22f2ac51b6d643666f4db093f13144f773ff3f3a upstream.
    [...]
    > The added sanity checks in this patch can crash kernels built with
    > CONFIG_DEBUG_VM. While I doubt many people run 3.16 with that enabled,
    > please also consider taking the following two changes. The first one
    > changes the new VM_BUG_ONs to mere warnings, and the second patch
    > addresses the underlying issue that triggered them in the first place.
    >
    > 21f54ddae449 Using BUG_ON() as an assert() is _never_ acceptable
    > d3798ae8c6f3 mm: filemap: don't plant shadow entries without radix tree node
    >
    > Attaching the latter below, since it's drastically different than the
    > upstream change, but a lot simpler because it predates the DAX stuff.
    [...]

    Thanks, I've added these two.

    Ben.

    --
    Ben Hutchings
    Lowery's Law:
                 If it jams, force it. If it breaks, it needed replacing
    anyway.

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