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=-2.9 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,URIBL_BLOCKED,USER_AGENT_NEOMUTT 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 DB23BC04EB8 for ; Wed, 12 Dec 2018 13:36:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A1BED20873 for ; Wed, 12 Dec 2018 13:36:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A1BED20873 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=suse.com 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 S1727521AbeLLNgI (ORCPT ); Wed, 12 Dec 2018 08:36:08 -0500 Received: from mx2.suse.de ([195.135.220.15]:45868 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726245AbeLLNgI (ORCPT ); Wed, 12 Dec 2018 08:36:08 -0500 X-Virus-Scanned: by amavisd-new at test-mx.suse.de Received: from relay1.suse.de (unknown [195.135.220.254]) by mx1.suse.de (Postfix) with ESMTP id 140EAAD0C; Wed, 12 Dec 2018 13:36:06 +0000 (UTC) Date: Wed, 12 Dec 2018 14:36:03 +0100 From: Petr Mladek To: Sergey Senozhatsky Cc: Sasha Levin , Daniel Wang , Steven Rostedt , stable@vger.kernel.org, Alexander.Levin@microsoft.com, Andrew Morton , byungchul.park@lge.com, dave.hansen@intel.com, hannes@cmpxchg.org, jack@suse.cz, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mathieu Desnoyers , Mel Gorman , mhocko@kernel.org, pavel@ucw.cz, penguin-kernel@i-love.sakura.ne.jp, Peter Zijlstra , tj@kernel.org, Linus Torvalds , vbabka@suse.cz, Cong Wang , Peter Feiner Subject: Re: 4.14 backport request for dbdda842fe96f: "printk: Add console owner and waiter logic to load balance console writes" Message-ID: <20181212133603.yyu2zvw7g454zdqd@pathway.suse.cz> References: <20181022100952.GA1147@jagdpanzerIV> <20181109064740.GE599@jagdpanzerIV> <20181212052126.GF431@jagdpanzerIV> <20181212062841.GI431@jagdpanzerIV> <20181212064841.GB2746@sasha-vm> <20181212081034.GA32687@jagdpanzerIV> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20181212081034.GA32687@jagdpanzerIV> User-Agent: NeoMutt/20170421 (1.8.2) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed 2018-12-12 17:10:34, Sergey Senozhatsky wrote: > On (12/12/18 01:48), Sasha Levin wrote: > > > > > I guess we still don't have a really clear understanding of what exactly > > > > is going in your system > > > > > > > > I would also like to get to the bottom of it. Unfortunately I haven't > > > > got the expertise in this area nor the time to do it yet. Hence the > > > > intent to take a step back and backport Steven's patch to fix the > > > > issue that has resurfaced in our production recently. > > > > > > No problem. > > > I just meant that -stable people can be a bit "unconvinced". > > > > The -stable people tried adding this patch back in April, but ended up > > getting complaints up the wazoo (https://lkml.org/lkml/2018/4/9/154) > > about how this is not -stable material. > > OK, really didn't know that! I wasn't Cc-ed on that AUTOSEL email, > and I wasn't Cc-ed on this whole discussion and found it purely > accidentally while browsing linux-mm list. I am sorry that I did not CC you. There were so many people in CC. I expected that all people mentioned in the related commit message were included by default. > So if you are willing to backport this set to -stable, then I wouldn't > mind, probably would be more correct if we don't advertise this as a > "panic() deadlock fix" This should not be a problem. I guess that stable does not modify the original commit messages unless there is a change. > In the meantime, I can add my Acked-by to this backport if it helps. I am fine with back-porting the patches now. They have got much more testing in the meantime and nobody reported any regression. They seems to help in more situations than we expected. Finally, there is someone requesting the backport who spent non-trivial time on tracking the problem and testing. Best Regards, Petr