Received: by 2002:ac0:a582:0:0:0:0:0 with SMTP id m2-v6csp3451676imm; Fri, 19 Oct 2018 10:46:58 -0700 (PDT) X-Google-Smtp-Source: ACcGV63rXr5v+CX9K9ethXISGXsWrHUX+RWXngZ0+yGzsbYjmn4rnz5Ef1HMDwJS9mOtKGShUD+Y X-Received: by 2002:a17:902:bd0a:: with SMTP id p10-v6mr33980834pls.245.1539971218884; Fri, 19 Oct 2018 10:46:58 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1539971218; cv=none; d=google.com; s=arc-20160816; b=wcDOg2Z1hn51sgrJh4K6d9dVCyxMhJw38R2X4tdZTPIU4+Ya2dY7qnoUI9s4sSfYTC 6mcx1bknqFPQnb9SK+SJ2jxBT20lFGVzY5CHUuRZO6QRhYiKYk5rAB/uCpfNs3wfxnp5 6BQAHZ3KwRHSaTDiWuv0MYfTVZhwADvEkZrtKsYOpsIChEcmKsY7RfQF/tniWm16hUQ4 6B36OPrm2FiAe2Pf9yoyt2W1ctSOPqzHbBxif+uHsk3FHs1lCHTeomYtsrlieoWd4G6f J4E1yIL1fViCmy2z6ew418URTxApEr4qraJCvLwEVTLtmUyWhd/OgvkhTHgVLuZLr2pl 8jKQ== 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:from:subject:cc:to:message-id:date; bh=T2sdgh+uFTd4VboP7o95YNm9OJbNcJoPi2AP9EdgJzc=; b=PfcWAIH5OgUyfivIqCIYLZcTC36mta2tpaqOaRKAxZ5z89zvhqzsM08LI1IuH4M+s7 l00HDKKjZ0dwM+cH1CjafVQUrRjOz/GukZGnpqetj9ygL9EDnLYqicqlOZBDk0yOt7D2 kvtq8KJC40ZWbtQvLCmJWaDJV6JkjYlgdb9NDw+lKSBDbsevQP/v+xRISJgbR1iRk8YT Fo2I5vvP2fqQNNJOKSRuHjg5joP0HYe629+NjsakQVDria4VROPafyPHJEb2XVsNoRgn ZzM9ocj3y4zdYYvLRgNM5xDVjg9I4pRF9UkMo7pqjhyqL4QmAwtE1eE3/EaTRVgX/+y0 im8w== 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 m15-v6si24683907pga.114.2018.10.19.10.46.43; Fri, 19 Oct 2018 10:46:58 -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 S1728036AbeJTBxC (ORCPT + 99 others); Fri, 19 Oct 2018 21:53:02 -0400 Received: from shards.monkeyblade.net ([23.128.96.9]:46312 "EHLO shards.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728014AbeJTBxC (ORCPT ); Fri, 19 Oct 2018 21:53:02 -0400 Received: from localhost (unknown [IPv6:2601:601:9f80:35cd::cf9]) (using TLSv1 with cipher AES256-SHA (256/256 bits)) (Client did not present a certificate) (Authenticated sender: davem-davemloft) by shards.monkeyblade.net (Postfix) with ESMTPSA id 5B8141438CA8D; Fri, 19 Oct 2018 10:45:56 -0700 (PDT) Date: Fri, 19 Oct 2018 10:45:55 -0700 (PDT) Message-Id: <20181019.104555.830780623382872282.davem@davemloft.net> To: davej@codemonkey.org.uk Cc: mroos@linux.ee, xiyou.wangcong@gmail.com, linux-kernel@vger.kernel.org, netdev@vger.kernel.org Subject: Re: netconsole warning in 4.19.0-rc7 From: David Miller In-Reply-To: <20181019134704.ky2vqeij6m77qrpg@codemonkey.org.uk> References: <20181018145922.ytqxvdihp3iqounl@codemonkey.org.uk> <20181019134704.ky2vqeij6m77qrpg@codemonkey.org.uk> X-Mailer: Mew version 6.7 on Emacs 26 / Mule 6.0 (HANACHIRUSATO) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.5.12 (shards.monkeyblade.net [149.20.54.216]); Fri, 19 Oct 2018 10:45:56 -0700 (PDT) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Dave Jones Date: Fri, 19 Oct 2018 09:47:04 -0400 > On Fri, Oct 19, 2018 at 12:51:38PM +0300, Meelis Roos wrote: > > > > > I took another look at that error path. Turns out this is all we need I > > > > > think.. > > > > > > > > With this patch applied on top of 4.19-rc8, I stll get the warning: > > > > > > > > [ 13.722919] WARNING: CPU: 0 PID: 0 at kernel/softirq.c:168 __local_bh_enable_ip+0x2e/0x44 > > > > > > It's going to be a couple days before I get chance to get back to this. > > > Did the previous patch in this thread (without the _bh) fare any better? > > > > Tried it with rcu_read_unlock() instead, still the same. > > Ok, this is going to take more time than I have. DaveM, do you want > to revert 6fe9487892b32cb1c8b8b0d552ed7222a527fe30, or do you want a > patch doing the same ? > > That'll bring back the rcu warning, but fewer people were complaining > about that than this new issue.. I'll revert. Thanks Dave.