From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f69.google.com (mail-pg0-f69.google.com [74.125.83.69]) by kanga.kvack.org (Postfix) with ESMTP id A18D26B0033 for ; Sun, 10 Dec 2017 19:14:34 -0500 (EST) Received: by mail-pg0-f69.google.com with SMTP id x24so11489331pgv.5 for ; Sun, 10 Dec 2017 16:14:34 -0800 (PST) Received: from www262.sakura.ne.jp (www262.sakura.ne.jp. [2001:e42:101:1:202:181:97:72]) by mx.google.com with ESMTPS id a8si87102plz.534.2017.12.10.16.14.32 for (version=TLS1 cipher=AES128-SHA bits=128/128); Sun, 10 Dec 2017 16:14:33 -0800 (PST) Message-Id: <201712110014.vBB0ENwU088603@www262.sakura.ne.jp> Subject: Re: Google Chrome cause locks held in system (kernel 4.15 rc2) From: Tetsuo Handa MIME-Version: 1.0 Date: Mon, 11 Dec 2017 09:14:23 +0900 References: <201712092314.IGI39555.MtFFVLJFOQOSOH@I-love.SAKURA.ne.jp> <1512942574.23718.7.camel@gmail.com> In-Reply-To: <1512942574.23718.7.camel@gmail.com> Content-Type: text/plain; charset="ISO-2022-JP" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: mikhail Cc: Tetsuo Handa , mhocko@kernel.org, darrick.wong@oracle.com, linux-xfs@vger.kernel.org, linux-mm@kvack.org mikhail wrote: > On Sat, 2017-12-09 at 23:14 +0900, Tetsuo Handa wrote: > > Under OOM lockup situation, kernel messages can unlikely be saved to syslog > > files, for writing to files involves memory allocation. Can you set up > > netconsole or serial console explained at > > http://events.linuxfoundation.org/sites/events/files/slides/LCJ2014-en_0.pdf ? > > If neither console is possible, it would become difficult to debug. > > netconsole works only within local network? destination ip may be from > another network? netconsole can work with another network. (step 1) Verify that UDP packets are reachable. You can test with # echo test > /dev/udp/213.136.82.171/6666 if you are using bash. (step 2) Verify that you specified gateway's MAC address rather than target host's MAC address. "ff:ff:ff:ff:ff:ff" suggests that netconsole is unable to resolve correct MAC address. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org