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Wed, 01 Jul 2020 15:14:41 -0700 (PDT) Received: from localhost ([110.227.183.4]) by smtp.gmail.com with ESMTPSA id i196sm6902130pgc.55.2020.07.01.15.14.40 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 01 Jul 2020 15:14:41 -0700 (PDT) From: Bhupesh Sharma To: cgroups@vger.kernel.org, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org Cc: bhsharma@redhat.com, bhupesh.linux@gmail.com, Johannes Weiner , Michal Hocko , Vladimir Davydov , James Morse , Mark Rutland , Will Deacon , Catalin Marinas , linux-kernel@vger.kernel.org, kexec@lists.infradead.org Subject: [PATCH 0/2] arm64/kdump: Fix OOPS and OOM issues in kdump kernel Date: Thu, 2 Jul 2020 03:44:18 +0530 Message-Id: <1593641660-13254-1-git-send-email-bhsharma@redhat.com> X-Mailer: git-send-email 2.7.4 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=bhsharma@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=US-ASCII X-Rspamd-Queue-Id: 01D7E18038E68 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 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: Prabhakar recently reported a kdump kernel boot failure on ThunderX2 arm64 plaforms (which I was able to reproduce on ampere arm64 machines as well), (see [1]), which is seen when a corner case is hit on some arm64 boards when kdump kernel runs with "cgroup_disable=memory" passed to the kdump kernel (via bootargs) and the crashkernel was originally allocated from either a ZONE_DMA32 memory or mixture of memory chunks belonging to both ZONE_DMA and ZONE_DMA32 regions. While [PATCH 1/2] fixes the OOPS inside mem_cgroup_get_nr_swap_pages() function, [PATCH 2/2] fixes the OOM seen inside the kdump kernel by allocating the crashkernel inside ZONE_DMA region only. [1]. https://marc.info/?l=kexec&m=158954035710703&w=4 Cc: Johannes Weiner Cc: Michal Hocko Cc: Vladimir Davydov Cc: James Morse Cc: Mark Rutland Cc: Will Deacon Cc: Catalin Marinas Cc: cgroups@vger.kernel.org Cc: linux-mm@kvack.org Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Cc: kexec@lists.infradead.org Reported-by: Prabhakar Kushwaha Signed-off-by: Bhupesh Sharma Bhupesh Sharma (2): mm/memcontrol: Fix OOPS inside mem_cgroup_get_nr_swap_pages() arm64: Allocate crashkernel always in ZONE_DMA arch/arm64/mm/init.c | 16 ++++++++++++++-- mm/memcontrol.c | 9 ++++++++- 2 files changed, 22 insertions(+), 3 deletions(-) -- 2.7.4