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Date: Mon, 11 Jun 2018 10:19:25 -0400
From: Johannes Weiner <hannes@cmpxchg.org>
Subject: Re: [PATCH] mm: fix null pointer dereference in mem_cgroup_protected
Message-ID: <20180611141925.GC1507@cmpxchg.org>
References: <20180608170607.29120-1-guro@fb.com>
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To: Roman Gushchin <guro@fb.com>
Cc: Andrew Morton <akpm@linux-foundation.org>, Shakeel Butt <shakeelb@google.com>, linux-mm@kvack.org, kernel-team@fb.com, linux-kernel@vger.kernel.org, Michal Hocko <mhocko@kernel.org>

On Fri, Jun 08, 2018 at 06:06:07PM +0100, Roman Gushchin wrote:
> Shakeel reported a crash in mem_cgroup_protected(), which
> can be triggered by memcg reclaim if the legacy cgroup v1
> use_hierarchy=0 mode is used:
...
> Reported-by: Shakeel Butt <shakeelb@google.com>
> Signed-off-by: Roman Gushchin <guro@fb.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: Michal Hocko <mhocko@kernel.org>
> Cc: Andrew Morton <akpm@linux-foundation.org>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>