From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933057AbbLGP6N (ORCPT ); Mon, 7 Dec 2015 10:58:13 -0500 Received: from mail-yk0-f175.google.com ([209.85.160.175]:34919 "EHLO mail-yk0-f175.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932199AbbLGP6J (ORCPT ); Mon, 7 Dec 2015 10:58:09 -0500 Date: Mon, 7 Dec 2015 10:58:08 -0500 From: Tejun Heo To: Peter Zijlstra Cc: Ulrich Obergfell , Ingo Molnar , Andrew Morton , linux-kernel@vger.kernel.org, kernel-team@fb.com Subject: Re: [PATCH] workqueue: warn if memory reclaim tries to flush !WQ_MEM_RECLAIM workqueue Message-ID: <20151207155808.GG9175@mtj.duckdns.org> References: <20151203002810.GJ19878@mtj.duckdns.org> <20151203093350.GP17308@twins.programming.kicks-ass.net> <20151203100018.GO11639@twins.programming.kicks-ass.net> <20151203144811.GA27463@mtj.duckdns.org> <20151203150442.GR17308@twins.programming.kicks-ass.net> <20151203150604.GC27463@mtj.duckdns.org> <20151203192616.GJ27463@mtj.duckdns.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20151203192616.GJ27463@mtj.duckdns.org> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Dec 03, 2015 at 02:26:16PM -0500, Tejun Heo wrote: > Task or work item involved in memory reclaim trying to flush a > non-WQ_MEM_RECLAIM workqueue or one of its work items can lead to > deadlock. Trigger WARN_ONCE() if such conditions are detected. > > Signed-off-by: Tejun Heo > Cc: Peter Zijlstra Applied to wq/for-4.5. -- tejun