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From:   Aleksandr Nogikh <nogikh@google.com>
Date:   Fri, 2 Sep 2022 14:32:19 +0200
Message-ID: <CANp29Y5f0YNsPSzeNao7_1a8WUJTNBZuLX1sDQGey_7qC2tKcw@mail.gmail.com>
Subject: Re: [syzbot] WARNING: CPU: NUM PID: NUM at mm/huge_memory.c:LINE split_huge_page_to_l
To:     syzbot <syzbot+2184d61af7d9d86337fc@syzkaller.appspotmail.com>
Cc:     Andrew Morton <akpm@linux-foundation.org>,
        LKML <linux-kernel@vger.kernel.org>, linux-mm@kvack.org,
        "'Aleksandr Nogikh' via syzkaller-bugs" 
        <syzkaller-bugs@googlegroups.com>
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#syz dup: WARNING in split_huge_page_to_list (2)

On Wed, Aug 24, 2022 at 3:02 AM syzbot
<syzbot+2184d61af7d9d86337fc@syzkaller.appspotmail.com> wrote:
>
> Hello,
>
> syzbot found the following issue on:
>
> HEAD commit:    680fb5b009e8 Merge tag 'arm64-upstream' into for-kernelci
> git tree:       git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-kernelci
> console output: https://syzkaller.appspot.com/x/log.txt?x=13d186a5080000
> kernel config:  https://syzkaller.appspot.com/x/.config?x=4557ad2600fc45f4
> dashboard link: https://syzkaller.appspot.com/bug?extid=2184d61af7d9d86337fc
> compiler:       Debian clang version 13.0.1-++20220126092033+75e33f71c2da-1~exp1~20220126212112.63, GNU ld (GNU Binutils for Debian) 2.35.2
> userspace arch: arm64
> syz repro:      https://syzkaller.appspot.com/x/repro.syz?x=13c0bffd080000
> C reproducer:   https://syzkaller.appspot.com/x/repro.c?x=1217ce8d080000
>
> IMPORTANT: if you fix the issue, please add the following tag to the commit:
> Reported-by: syzbot+2184d61af7d9d86337fc@syzkaller.appspotmail.com
>
> raw: 05ffc00000010801 0000000000000000 dead000000000122 0000000000000000
> raw: 0000000000000000 0000000000000000 00000002ffffffff 0000000000000000
> page dumped because: VM_WARN_ON_ONCE_PAGE(is_hzp)
> ------------[ cut here ]------------
> WARNING: CPU: 0 PID: 3026 at mm/huge_memory.c:2555 split_huge_page_to_l
>
>
> ---
> This report is generated by a bot. It may contain errors.
> See https://goo.gl/tpsmEJ for more information about syzbot.
> syzbot engineers can be reached at syzkaller@googlegroups.com.
>
> syzbot will keep track of this issue. See:
> https://goo.gl/tpsmEJ#status for how to communicate with syzbot.
> syzbot can test patches for this issue, for details see:
> https://goo.gl/tpsmEJ#testing-patches
>
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