Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.14 308/496] mm, slab: memcg_link the SLABs kmem_cache | Date | Mon, 28 May 2018 12:01:33 +0200 |
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4.14-stable review patch. If anyone has any objections, please let me know.
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From: Shakeel Butt <shakeelb@google.com>
[ Upstream commit 880cd276dff17ea29e9a8404275c9502b265afa7 ]
All the root caches are linked into slab_root_caches which was introduced by the commit 510ded33e075 ("slab: implement slab_root_caches list") but it missed to add the SLAB's kmem_cache.
While experimenting with opt-in/opt-out kmem accounting, I noticed system crashes due to NULL dereference inside cache_from_memcg_idx() while deferencing kmem_cache.memcg_params.memcg_caches. The upstream clean kernel will not see these crashes but SLAB should be consistent with SLUB which does linked its boot caches (kmem_cache_node and kmem_cache) into slab_root_caches.
Link: http://lkml.kernel.org/r/20180319210020.60289-1-shakeelb@google.com Fixes: 510ded33e075c ("slab: implement slab_root_caches list") Signed-off-by: Shakeel Butt <shakeelb@google.com> Cc: Tejun Heo <tj@kernel.org> Cc: Vladimir Davydov <vdavydov.dev@gmail.com> Cc: Greg Thelen <gthelen@google.com> Cc: Christoph Lameter <cl@linux.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: David Rientjes <rientjes@google.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Sasha Levin <alexander.levin@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- mm/slab.c | 1 + 1 file changed, 1 insertion(+)
--- a/mm/slab.c +++ b/mm/slab.c @@ -1283,6 +1283,7 @@ void __init kmem_cache_init(void) nr_node_ids * sizeof(struct kmem_cache_node *), SLAB_HWCACHE_ALIGN); list_add(&kmem_cache->list, &slab_caches); + memcg_link_cache(kmem_cache); slab_state = PARTIAL; /*
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