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Date: Tue, 10 Apr 2018 13:48:37 -0700
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v3] writeback: safer lock nesting
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References: <201804080259.VS5U0mKT%fengguang.wu@intel.com>
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To: Michal Hocko <mhocko@kernel.org>
Cc: Greg Thelen <gthelen@google.com>, Wang Long <wanglong19@meituan.com>, Johannes Weiner <hannes@cmpxchg.org>, Tejun Heo <tj@kernel.org>, npiggin@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org

On Tue, 10 Apr 2018 08:33:57 +0200 Michal Hocko <mhocko@kernel.org> wrote:

> > Reported-by: Wang Long <wanglong19@meituan.com>
> > Signed-off-by: Greg Thelen <gthelen@google.com>
> > Change-Id: Ibb773e8045852978f6207074491d262f1b3fb613
> 
> Not a stable material IMHO

Why's that?  Wang Long said he's observed the deadlock three times?