Received: by 10.213.65.68 with SMTP id h4csp4370789imn; Tue, 10 Apr 2018 13:52:39 -0700 (PDT) X-Google-Smtp-Source: AIpwx4/HDwzw9WXTW+g2eBTG1lKvxKn45ckjoakXrkDY6uRodXs0+ugmE1E9ap+SnORMi37OzRZ2 X-Received: by 10.101.87.136 with SMTP id b8mr1358618pgr.282.1523393558987; Tue, 10 Apr 2018 13:52:38 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1523393558; cv=none; d=google.com; s=arc-20160816; b=Psm6+gBEhFhDcyuUXSfNReoILicKNnW+0GgCCNneG/WHy3UA4tNFH2ijS/tvICeHWF +FZy6J3IVNHxPz9sQVEhS7fru1LdPgTzJNR8tX+NCJoM4KVSFViN0IotnTyr+NlUcBkL 6d7fSQvDXRHKNiLQIPaHfdJrSvgl41ij+fstqEoIrtlfQq646tla580CwulYuUemiuFG 4OzBsUEaVHVoh5YRm2g9EU/u3SscgJB+4ZI+bkwU3d+BkW2bA3Y1i+1HEdcyfm1nZIvO NwxhJn8/l9iBGEEBM47+ZSkb7Jr590BIlnz6bbn4hB5j18/EGh/dvmnj3CAEDNHeLMqL a/XA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :arc-authentication-results; bh=Wk7jQJGKmw8ewBBG5f9+xdmOQJi4SsrAW+yTxD5Bfuc=; b=CeK/QDQgtOGdiUzKRAPV7GEg/A0/DXGNvxJPOEaqsULXz8q8VCfFFFr7QGXlwguCyY C9vsC5IXzSIwlxdwcsgpSktGdULbXHGMBBPZMocgCLaTX9OLFuovb54yrCHtM+IW6uDD Aaoqd5V2kcbr/CDhzqnhenwqpCz9hmHnzJWyzWBOrdx75FH0ke2ocbIxQi1ltjQp3HoZ rasKdIM5kKCKxyylU64nUrlpzdjkS0vQ8aFhzvrhs3tUFvyn8QFNvXkKZ3kyrp6JOAqP dOCIB79Oh8cplUoSqQNGkB9C4iH/0r/EsffLPggT8cK92uDvo0zP6ijyphfq9c+ZWKYY 15xA== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id u10-v6si2792830plr.123.2018.04.10.13.52.02; Tue, 10 Apr 2018 13:52:38 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752163AbeDJUsj (ORCPT + 99 others); Tue, 10 Apr 2018 16:48:39 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:41946 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751589AbeDJUsi (ORCPT ); Tue, 10 Apr 2018 16:48:38 -0400 Received: from akpm3.svl.corp.google.com (unknown [104.133.9.71]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 46F0ADDB; Tue, 10 Apr 2018 20:48:38 +0000 (UTC) Date: Tue, 10 Apr 2018 13:48:37 -0700 From: Andrew Morton To: Michal Hocko Cc: Greg Thelen , Wang Long , Johannes Weiner , Tejun Heo , npiggin@gmail.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v3] writeback: safer lock nesting Message-Id: <20180410134837.d2b0f2d1cd940bb08c2bad0a@linux-foundation.org> In-Reply-To: <20180410063357.GS21835@dhcp22.suse.cz> References: <201804080259.VS5U0mKT%fengguang.wu@intel.com> <20180410005908.167976-1-gthelen@google.com> <20180410063357.GS21835@dhcp22.suse.cz> X-Mailer: Sylpheed 3.5.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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?