The patch titled
Subject: mm/mempolicy.c: fix an incorrect rebind node in mpol_rebind_nodemask
has been added to the -mm tree. Its filename is
mm-mempolicy-fix-an-incorrect-rebind-node-in-mpol_rebind_nodemask.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-mempolicy-fix-an-incorrect-rebind-node-in-mpol_rebind_nodemask.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-mempolicy-fix-an-incorrect-rebind-node-in-mpol_rebind_nodemask.patch
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------------------------------------------------------
From: zhong jiang <zhongjiang@xxxxxxxxxx>
Subject: mm/mempolicy.c: fix an incorrect rebind node in mpol_rebind_nodemask
We bind an different node to different vma, Unluckily, it will bind a
different vma to the same node by checking /proc/pid/numa_maps.
213980c0f23b ("mm, mempolicy: simplify rebinding mempolicies when updating
cpusets") introduced the issue. When we change memory policy by setting
cpuset.mems, a process will rebind the specified policy more than one
time. If cpuset_mems_allowed is not equal to the user specified nodes the
issue will trigger. This may result in an OOM when allocating memory from
the same node.
Link: http://lkml.kernel.org/r/1558768043-23184-1-git-send-email-zhongjiang@xxxxxxxxxx
Fixes: 213980c0f23b ("mm, mempolicy: simplify rebinding mempolicies when updating cpusets")
Signed-off-by: zhong jiang <zhongjiang@xxxxxxxxxx>
Cc: Oscar Salvador <osalvador@xxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Ralph Campbell <rcampbell@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/mempolicy.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/mm/mempolicy.c~mm-mempolicy-fix-an-incorrect-rebind-node-in-mpol_rebind_nodemask
+++ a/mm/mempolicy.c
@@ -306,7 +306,7 @@ static void mpol_rebind_nodemask(struct
else {
nodes_remap(tmp, pol->v.nodes,pol->w.cpuset_mems_allowed,
*nodes);
- pol->w.cpuset_mems_allowed = tmp;
+ pol->w.cpuset_mems_allowed = *nodes;
}
if (nodes_empty(tmp))
_
Patches currently in -mm which might be from zhongjiang@xxxxxxxxxx are
mm-mempolicy-fix-an-incorrect-rebind-node-in-mpol_rebind_nodemask.patch
