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From:   huang ying <huang.ying.caritas@gmail.com>
Date:   Mon, 22 Jul 2019 09:37:37 +0800
Message-ID: <CAC=cRTMz5S636Wfqdn3UGbzwzJ+v_M46_juSfoouRLS1H62orQ@mail.gmail.com>
Subject: Re: kernel BUG at mm/swap_state.c:170!
To:     Mikhail Gavrilov <mikhail.v.gavrilov@gmail.com>
Cc:     Linux List Kernel Mailing <linux-kernel@vger.kernel.org>,
        linux-mm@kvack.org, Huang Ying <ying.huang@intel.com>
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Hi, Mikhail,

On Wed, May 29, 2019 at 12:05 PM Mikhail Gavrilov
<mikhail.v.gavrilov@gmail.com> wrote:
>
> Hi folks.
> I am observed kernel panic after update to git tag 5.2-rc2.
> This crash happens at memory pressing when swap being used.
>
> Unfortunately in journalctl saved only this:
>
> May 29 08:02:02 localhost.localdomain kernel: page:ffffe90958230000
> refcount:1 mapcount:1 mapping:ffff8f3ffeb36949 index:0x625002ab2
> May 29 08:02:02 localhost.localdomain kernel: anon
> May 29 08:02:02 localhost.localdomain kernel: flags:
> 0x17fffe00080034(uptodate|lru|active|swapbacked)
> May 29 08:02:02 localhost.localdomain kernel: raw: 0017fffe00080034
> ffffe90944640888 ffffe90956e208c8 ffff8f3ffeb36949
> May 29 08:02:02 localhost.localdomain kernel: raw: 0000000625002ab2
> 0000000000000000 0000000100000000 ffff8f41aeeff000
> May 29 08:02:02 localhost.localdomain kernel: page dumped because:
> VM_BUG_ON_PAGE(entry != page)
> May 29 08:02:02 localhost.localdomain kernel: page->mem_cgroup:ffff8f41aeeff000
> May 29 08:02:02 localhost.localdomain kernel: ------------[ cut here
> ]------------
> May 29 08:02:02 localhost.localdomain kernel: kernel BUG at mm/swap_state.c:170!

I am trying to reproduce this bug.  Can you give me some information
about your test case?

Best Regards,
Huang, Ying