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[209.85.220.65]) by mx.google.com with SMTPS id b2sor8314660edd.17.2019.05.17.10.25.01 for (Google Transport Security); Fri, 17 May 2019 10:25:01 -0700 (PDT) Received-SPF: pass (google.com: domain of pasha.tatashin@soleen.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@soleen.com header.s=google header.b=h+8kfPwU; spf=pass (google.com: domain of pasha.tatashin@soleen.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=pasha.tatashin@soleen.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=soleen.com; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=KwxwPmgRkigdfsb2Wkb3RXFjzIqZbXV/qcyPm1HcIzw=; b=h+8kfPwUUJsUPbqk+gDlpRaeblBYE2fVW4Jl93m9L3oQKmknNCCYpao0UAd7gBMUks hPvzLnV7CdDh1/rNOvJ7v46flOg1P7P7cz6XzbCBCYHErwbjvAFHO8kAhowextIXP4K4 wzyiG8+QdxKuZNzJAzTPlvWNsDUXruxytbe9VLr0sdzVqplAx0E4U5nvXrgAe4wbMxl6 QCdQFy8r/2NXOgZ7Bbo8ZNYPwRVsY0c/6q0Ka037S0t7VHH6Oc7AMl/o6AVCy4Fohq/H 1yjg5kwJzWMAQJFZgNugwf1zgUhfH+A3fbYIKv1b5n1rqomPr0aaze9q+ODnrQSUr8zZ LBbg== X-Google-Smtp-Source: APXvYqwuyoSofrRAesux3TtniZbFtgeLGQpt/aaMsVyOQkqGRmuP2nmCLcnqBJYgiPbnM95G5HbA4GXqURtKw0f2SUc= X-Received: by 2002:a50:ec87:: with SMTP id e7mr58594743edr.126.1558113901537; Fri, 17 May 2019 10:25:01 -0700 (PDT) MIME-Version: 1.0 References: <20190517143816.GO6836@dhcp22.suse.cz> In-Reply-To: From: Pavel Tatashin Date: Fri, 17 May 2019 13:24:50 -0400 Message-ID: Subject: Re: NULL pointer dereference during memory hotremove To: Michal Hocko Cc: "Verma, Vishal L" , "linux-kernel@vger.kernel.org" , "jmorris@namei.org" , "tiwai@suse.de" , "sashal@kernel.org" , "linux-mm@kvack.org" , "dave.hansen@linux.intel.com" , "david@redhat.com" , "bp@suse.de" , "akpm@linux-foundation.org" , "linux-nvdimm@lists.01.org" , "jglisse@redhat.com" , "zwisler@kernel.org" , "Jiang, Dave" , "bhelgaas@google.com" , "Busch, Keith" , "thomas.lendacky@amd.com" , "Huang, Ying" , "Wu, Fengguang" , "baiyaowei@cmss.chinamobile.com" Content-Type: text/plain; charset="UTF-8" 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: On Fri, May 17, 2019 at 1:22 PM Pavel Tatashin wrote: > > On Fri, May 17, 2019 at 10:38 AM Michal Hocko wrote: > > > > On Fri 17-05-19 10:20:38, Pavel Tatashin wrote: > > > This panic is unrelated to circular lock issue that I reported in a > > > separate thread, that also happens during memory hotremove. > > > > > > xakep ~/x/linux$ git describe > > > v5.1-12317-ga6a4b66bd8f4 > > > > Does this happen on 5.0 as well? > > Yes, just reproduced it on 5.0 as well. Unfortunately, I do not have a > script, and have to do it manually, also it does not happen every > time, it happened on 3rd time for me. Actually, sorry, I have not tested 5.0, I compiled 5.0, but my script still tested v5.1-12317-ga6a4b66bd8f4 build. I will report later if I am able to reproduce it on 5.0. Pasha