Messages in this thread | | | From | Bhupesh Sharma <> | Subject | [PATCH 0/2] arm64/kdump: Fix OOPS and OOM issues in kdump kernel | Date | Thu, 2 Jul 2020 03:44:18 +0530 |
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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 <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: James Morse <james.morse@arm.com> Cc: Mark Rutland <mark.rutland@arm.com> Cc: Will Deacon <will@kernel.org> Cc: Catalin Marinas <catalin.marinas@arm.com> 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 <pkushwaha@marvell.com> Signed-off-by: Bhupesh Sharma <bhsharma@redhat.com>
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
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