From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pl0-f70.google.com (mail-pl0-f70.google.com [209.85.160.70]) by kanga.kvack.org (Postfix) with ESMTP id 4572B6B0005 for ; Wed, 11 Apr 2018 01:50:08 -0400 (EDT) Received: by mail-pl0-f70.google.com with SMTP id 61-v6so548735plz.20 for ; Tue, 10 Apr 2018 22:50:08 -0700 (PDT) Received: from mx2.suse.de (mx2.suse.de. [195.135.220.15]) by mx.google.com with ESMTPS id z79si337723pfa.120.2018.04.10.22.50.06 for (version=TLS1 cipher=AES128-SHA bits=128/128); Tue, 10 Apr 2018 22:50:07 -0700 (PDT) Date: Wed, 11 Apr 2018 07:50:02 +0200 From: Michal Hocko Subject: Re: [PATCH v3] writeback: safer lock nesting Message-ID: <20180411055002.GA30893@dhcp22.suse.cz> References: <201804080259.VS5U0mKT%fengguang.wu@intel.com> <20180410005908.167976-1-gthelen@google.com> <20180410063357.GS21835@dhcp22.suse.cz> <20180410134837.d2b0f2d1cd940bb08c2bad0a@linux-foundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20180410134837.d2b0f2d1cd940bb08c2bad0a@linux-foundation.org> Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Greg Thelen , Wang Long , Johannes Weiner , Tejun Heo , npiggin@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org On Tue 10-04-18 13:48:37, Andrew Morton wrote: > On Tue, 10 Apr 2018 08:33:57 +0200 Michal Hocko wrote: > > > > Reported-by: Wang Long > > > Signed-off-by: Greg Thelen > > > Change-Id: Ibb773e8045852978f6207074491d262f1b3fb613 > > > > Not a stable material IMHO > > Why's that? Wang Long said he's observed the deadlock three times? I thought it is just too unlikely to hit all the conditions. My fault, I have completely missed/forgot the fact Wang Long is seeing the issue happening. No real objection for the stable backport from me. -- Michal Hocko SUSE Labs