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Date:   Sun, 17 Jan 2021 11:08:09 +0100
From:   Dmitry Vyukov <>
To:     Matthew Wilcox <>
Cc:     Andrew Morton <>,
        syzbot <>,
        LKML <>,
        Linux-MM <>,
        syzkaller-bugs <>,
        Thomas Gleixner <>
Subject: Re: kernel BUG at include/linux/highmem.h:LINE!

On Tue, Nov 24, 2020 at 5:14 AM Matthew Wilcox <> wrote:
> On Mon, Nov 23, 2020 at 07:42:30PM -0800, Andrew Morton wrote:
> > Matthew's series "Overhaul multi-page lookups for THP" chnages the
> > shmem code quite a bit, and in the area of truncate.  Matthew, could
> > you please fire up that reproducer?
> Almost certainly my fault.  I was trying to get the shmem truncate code
> in better shape before posting my series of fixes.  I'll send you a batch
> of four which fix problems noticed by Hugh.  There's at least one more
> to come.

#syz fix: mm: support THPs in zero_user_segments

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