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=-6.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE, SPF_PASS,UNPARSEABLE_RELAY,USER_AGENT_SANE_1 autolearn=no 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 C4C80C432BE for ; Tue, 31 Aug 2021 08:31:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A866F60F9E for ; Tue, 31 Aug 2021 08:31:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240299AbhHaIcQ (ORCPT ); Tue, 31 Aug 2021 04:32:16 -0400 Received: from out30-54.freemail.mail.aliyun.com ([115.124.30.54]:36328 "EHLO out30-54.freemail.mail.aliyun.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240190AbhHaIcO (ORCPT ); Tue, 31 Aug 2021 04:32:14 -0400 X-Alimail-AntiSpam: AC=PASS;BC=-1|-1;BR=01201311R571e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=e01e04400;MF=jnwang@linux.alibaba.com;NM=1;PH=DS;RN=6;SR=0;TI=SMTPD_---0Umjn3cu_1630398676; Received: from B-VE2WML7H-1820.local(mailfrom:jnwang@linux.alibaba.com fp:SMTPD_---0Umjn3cu_1630398676) by smtp.aliyun-inc.com(127.0.0.1); Tue, 31 Aug 2021 16:31:16 +0800 Subject: Re: kernel hang during reboot when cmdline include a non-exist console device To: Petr Mladek , Sergey Senozhatsky Cc: Linus Torvalds , Steven Rostedt , John Ogness , Linux Kernel Mailing List References: From: James Wang Message-ID: <6970d88b-03e4-61ee-c280-1206d3ace0d9@linux.alibaba.com> Date: Tue, 31 Aug 2021 16:31:16 +0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 在 2021/8/31 PM4:14, Petr Mladek 写道: > Adding the reporter into Cc. > > On Tue 2021-08-31 12:17:59, Sergey Senozhatsky wrote: >> On (21/08/30 19:53), Linus Torvalds wrote: >>> There's a bugzilla for this, but let's just move it to reguilar email, >>> unless some of you want to track it that way. >>> >>> The bugzilla entry says >>> >>> "When reboot， the capslock key of thinkpad x1 starts blinking" >>> >>> which sounds like there's an oops that just isn't showing, quite >>> possibly because the console has already been shut down. >>> >>> I didn't test this out, and would sincerely hope that somebody else is >>> willing to follow up on it since I'm in the busiest part of the merge >>> window. >> [..] >> >>>> https://bugzilla.kernel.org/show_bug.cgi?id=214201 >> I think normally wrong/empty console boot argument should not cause >> problems. We have a huge number of devices that use console="", for >> instance. But on some hardware this triggers panic(), very early on. >> >> I have the same symptoms on my laptop, and so far haven't been able >> to figure out how to track it down, but I need to re-start my investigation. > Sergey, I think that you talk about the crash where there is no registered > console and console_on_rootfs() fails to create stdin, stdout, and > stderr for the init process. As a result the kernel crashes > during boot. > > But the bugreport says that the system booted. It crashed later during > reboot. It will likely be in the shutdown phase. It still might be still > be caused by the missing console. But we should rule out other > problems. > > James, do you see the problem: > > 1. When there is a real console registered. When you remove the > wrong console= parameter. if I use a real tty, no problem; > > 2. When using "reboot -f" so that the system reboots a dirty way > without trying to shut down services. Yes，I have to use "reboot -f" to avoid a cold reboot; > Best Regards, > Petr