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Sat, 29 Jun 2024 22:22:22 -0400 (EDT) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.11.0-alpha0-538-g1508afaa2-fm-20240616.001-g1508afaa MIME-Version: 1.0 Message-Id: In-Reply-To: References: Date: Sun, 30 Jun 2024 03:22:05 +0100 From: "Jiaxun Yang" To: "Yu Zhao" , "linux-mips@vger.kernel.org" Cc: Linux-MM Subject: Re: MCEs on MIPS: multiple matching TLB entries Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable X-Stat-Signature: ge4kutxfxtiscow46sy9zwremx8onudo X-Rspamd-Queue-Id: CA94420006 X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1719714143-415734 X-HE-Meta: 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 Eb97c4DX audJhHU8ZshnMD+dNiY13mMfw5YgFrQD3On/8mtUq3ZebdjJDZdsfQE97q0I9GcmmtnG1911OfLLFy/p/L64V+hKmjAnPwyYr0qRO7lg3RQ36SDn6DiHXTeIPSMGqk6IQvO9X6QJDAERBE8yej9PztpmkR3SFkO/LqnoDKWoivSZ9kjdW9X4HXz14FVQqzRacJlRKeUfmefkkJ36IV2jqWO9t5pW7hhqkD8cyz5k/NFXXPOVep1W3H41ndMfoz96oSbmKiWCcnYF8GjDPF9ybPHaIUaxs7qGKZH4eEU+7N6YgG+91IvlTykF6GFi5aPZ4gl3/Syqjf5Nd4+WrMtbgeHPDrQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: =E5=9C=A82024=E5=B9=B46=E6=9C=8828=E6=97=A5=E5=85=AD=E6=9C=88 =E4=B8=8B=E5= =8D=886:57=EF=BC=8CYu Zhao=E5=86=99=E9=81=93=EF=BC=9A > Hi, > > OpenWrt folks ran into MCEs caused by multiple matching TLB entries > [1], after they updated their kernel from v6.1 to v6.6. > > I reported similar crashes previously [2], on v6.4. So they asked me > whether I'm aware of a fix from the mainline, which I am not. > on > I took a quick look from the MM's POV and found nothing obviously > wrong. I'm hoping they have better luck with the MIPS experts. Hi Yu, I never hit such problem on my (non-bcm) 74Kc systems. However a quick glance suggested it may be related to Wired TLB entries on your platform. Both duplicated TLB entries, Index 2 and 3, are all below "Wired" settin= g, which means they are not managed by mm, but platform code. Thanks - Jiaxun > > Thanks! > > [1] https://github.com/openwrt/openwrt/pull/15635 > [2]=20 > https://lore.kernel.org/linux-mm/CAOUHufbAjZd4Mxkio9OGct-TZ=3DL0QRG+_6= Xa7atQVFN_4ez86w@mail.gmail.com/ > --=20 - Jiaxun