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[195.135.220.15]) by mx.google.com with ESMTPS id e52si11883462edb.265.2019.05.20.00.03.20 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 20 May 2019 00:03:20 -0700 (PDT) Received-SPF: softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) client-ip=195.135.220.15; Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning mhocko@kernel.org does not designate 195.135.220.15 as permitted sender) smtp.mailfrom=mhocko@kernel.org; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay2.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 6293CAE48; Mon, 20 May 2019 07:03:19 +0000 (UTC) Date: Mon, 20 May 2019 09:03:17 +0200 From: Michal Hocko To: Pavel Tatashin 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" Subject: Re: NULL pointer dereference during memory hotremove Message-ID: <20190520070317.GU6836@dhcp22.suse.cz> References: <20190517143816.GO6836@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) 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 17-05-19 13:33:25, Pavel Tatashin wrote: > On Fri, May 17, 2019 at 1:24 PM Pavel Tatashin > wrote: > > > > 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. > > OK, confirmed on 5.0 as well, took 4 tries to reproduce: What is the last version that survives? Can you bisect? -- Michal Hocko SUSE Labs