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[71.184.117.43]) by smtp.gmail.com with ESMTPSA id m33sm7851275qte.17.2020.04.27.06.45.31 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 27 Apr 2020 06:45:32 -0700 (PDT) Content-Type: text/plain; charset=utf-8 Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.80.23.2.2\)) Subject: Re: compaction: VM_BUG_ON_PAGE(!zone_spans_pfn(page_zone(page), pfn)) From: Qian Cai In-Reply-To: <20200426144139.GA340887@linux.ibm.com> Date: Mon, 27 Apr 2020 09:45:31 -0400 Cc: Mel Gorman , Vlastimil Babka , Michal Hocko , David Hildenbrand , Linux-MM , LKML , Baoquan He Content-Transfer-Encoding: quoted-printable Message-Id: References: <8C537EB7-85EE-4DCF-943E-3CC0ED0DF56D@lca.pw> <20200426144139.GA340887@linux.ibm.com> To: Mike Rapoport X-Mailer: Apple Mail (2.3608.80.23.2.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > On Apr 26, 2020, at 10:41 AM, Mike Rapoport = 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=