linux-kernel - Re: kernel BUG at include/linux/highmem.h:LINE!

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Message-ID: <CACT4Y+ZXqLNbFVdvOrfUyStf9OWhbg4QREu50_D4U5hUb9En2A@mail.gmail.com>
Date:   Sun, 17 Jan 2021 11:08:09 +0100
From:   Dmitry Vyukov <dvyukov@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        syzbot <syzbot+dcb847a3e1e0ecd191ab@...kaller.appspotmail.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Linux-MM <linux-mm@...ck.org>,
        syzkaller-bugs <syzkaller-bugs@...glegroups.com>,
        Thomas Gleixner <tglx@...utronix.de>
Subject: Re: kernel BUG at include/linux/highmem.h:LINE!

On Tue, Nov 24, 2020 at 5:14 AM Matthew Wilcox <willy@...radead.org> 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