From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CE691C00449 for ; Fri, 5 Oct 2018 19:46:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9E32D2064A for ; Fri, 5 Oct 2018 19:46:43 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 9E32D2064A Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=linux-foundation.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728805AbeJFCqy (ORCPT ); Fri, 5 Oct 2018 22:46:54 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:35708 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728170AbeJFCqy (ORCPT ); Fri, 5 Oct 2018 22:46:54 -0400 Received: from akpm3.svl.corp.google.com (unknown [104.133.8.65]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 370B767B0; Fri, 5 Oct 2018 19:46:40 +0000 (UTC) Date: Fri, 5 Oct 2018 12:46:40 -0700 From: Andrew Morton To: Dave Chinner Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org Subject: Re: [PATCH] writeback: fix range_cyclic writeback vs writepages deadlock Message-Id: <20181005124640.3de2ba9dec8c713ee8cf286b@linux-foundation.org> In-Reply-To: <20181005054526.21507-1-david@fromorbit.com> References: <20181005054526.21507-1-david@fromorbit.com> X-Mailer: Sylpheed 3.6.0 (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 Fri, 5 Oct 2018 15:45:26 +1000 Dave Chinner wrote: > From: Dave Chinner > > We've recently seen a workload on XFS filesystems with a repeatable > deadlock between background writeback and a multi-process > application doing concurrent writes and fsyncs to a small range of a > file. > > ... > > Signed-off-by: Dave Chinner > Reviewed-by: Jan Kara Not a serious enough problem for a -stable backport?