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Date:   Tue, 24 Nov 2020 04:14:17 +0000
From:   Matthew Wilcox <willy@infradead.org>
To:     Andrew Morton <akpm@linux-foundation.org>
Cc:     syzbot <syzbot+dcb847a3e1e0ecd191ab@syzkaller.appspotmail.com>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        syzkaller-bugs@googlegroups.com,
        Thomas Gleixner <tglx@linutronix.de>
Subject: Re: kernel BUG at include/linux/highmem.h:LINE!
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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.