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Subject: Re: compaction: VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn))
From:   Qian Cai <cai@lca.pw>
In-Reply-To: <20200426144139.GA340887@linux.ibm.com>
Date:   Mon, 27 Apr 2020 09:45:31 -0400
Cc:     Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>,
        Michal Hocko <mhocko@kernel.org>,
        David Hildenbrand <david@redhat.com>,
        Linux-MM <linux-mm@kvack.org>,
        LKML <linux-kernel@vger.kernel.org>, Baoquan He <bhe@redhat.com>
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Message-Id: <AFCC92A8-8D2F-4A52-9656-7627904D0AFE@lca.pw>
References: <8C537EB7-85EE-4DCF-943E-3CC0ED0DF56D@lca.pw>
 <20200426144139.GA340887@linux.ibm.com>
To:     Mike Rapoport <rppt@linux.ibm.com>
Sender: linux-kernel-owner@vger.kernel.org
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> On Apr 26, 2020, at 10:41 AM, Mike Rapoport <rppt@linux.ibm.com> =
wrote:
>=20
> Hi,
>=20
> On Thu, Apr 23, 2020 at 05:25:56PM -0400, Qian Cai wrote:
>> Compaction starts to crash below on linux-next today. The faulty page =
belongs to Node 0 DMA32 zone.
>> I=E2=80=99ll continue to narrow it down, but just want to give a =
headup in case someone could beat me to it.
>>=20
>> Debug output from free_area_init_core()
>> [    0.000000] KK start page =3D ffffea0000000040, end page =3D =
ffffea0000040000, nid =3D 0 DMA
>> [    0.000000] KK start page =3D ffffea0000040000, end page =3D =
ffffea0004000000, nid =3D 0 DMA32
>> [    0.000000] KK start page =3D ffffea0004000000, end page =3D =
ffffea0012000000, nid =3D 0 NORMAL
>> [    0.000000] KK start page =3D ffffea0012000000, end page =3D =
ffffea0021fc0000, nid =3D 4 NORMAL
>>=20
>> I don=E2=80=99t understand how it could end up in such a situation. =
There are several recent patches look
>> more related than some others.
>=20
> Can you please add "mminit_loglevel=3D4 memblock=3Ddebug" to the =
kernel
> command line?

https://cailca.github.io/files/dmesg.txt=