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dkim=fail ("headers rsa verify failed") header.d=fujitsu.com header.s=fj1 header.b=ZG+79UWn; arc=pass ("microsoft.com:s=arcselector9901:i=1"); spf=pass (imf01.hostedemail.com: domain of a.naribayashi@fujitsu.com designates 216.71.158.33 as permitted sender) smtp.mailfrom=a.naribayashi@fujitsu.com; dmarc=pass (policy=none) header.from=fujitsu.com X-Stat-Signature: 3ug5ms5id61hj74n91z8tiridmb1e1o1 X-HE-Tag: 1667972535-596110 X-Bogosity: Ham, tests=bogofilter, spamicity=0.153587, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, 7 Nov 2022 15:43:56 +0000, Mei Gorman wrote: > On Mon, Nov 07, 2022 at 12:32:34PM +0000, Akira Naribayashi (Fujitsu) wro= te: > > > Under what circumstances will this panic occur? I assume those > > > circumstnces are pretty rare, give that 6e2b7044c1992 was nearly two > > > years ago. > > >=20 > > > Did you consider the desirability of backporting this fix into earlie= r > > > kernels? > >=20 > >=20 > > Panic can occur on systems with multiple zones in a single pageblock. > >=20 >=20 > Please provide an example of the panic and the zoneinfo. This issue is occurring in our customer's environment and cannot=20 be shared publicly as it contains customer information. Also, the panic is occurring with the kernel in RHEL and may not=20 panic with Upstream's community kernel. In other words, it is possible to panic on older kernels. I think this fix should be backported to stable kernel series. > > The reason it is rare is that it only happens in special configurations= . >=20 > How is this special configuration created? This is the case when the node boundary is not aligned to pageblock boundar= y.