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[209.132.183.28]) by mx.google.com with ESMTPS id 1si2778958qvx.176.2019.05.17.07.58.52 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 17 May 2019 07:58:52 -0700 (PDT) Received-SPF: pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of david@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx04.intmail.prod.int.phx2.redhat.com [10.5.11.14]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 0D90A309264C; Fri, 17 May 2019 14:58:44 +0000 (UTC) Received: from [10.36.118.100] (unknown [10.36.118.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id 123265DA63; Fri, 17 May 2019 14:58:33 +0000 (UTC) Subject: Re: NULL pointer dereference during memory hotremove To: Michal Hocko , 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" , "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" References: <20190517143816.GO6836@dhcp22.suse.cz> From: David Hildenbrand Openpgp: preference=signencrypt Autocrypt: addr=david@redhat.com; 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Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.6.1 MIME-Version: 1.0 In-Reply-To: <20190517143816.GO6836@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.43]); Fri, 17 May 2019 14:58:51 +0000 (UTC) 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 17.05.19 16:38, 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? > We have on the list [PATCH V3 1/4] mm/hotplug: Reorder arch_remove_memory() call in __remove_memory() Can that help? -- Thanks, David / dhildenb