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=-9.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 A00D3C433DF for ; Sun, 2 Aug 2020 10:58:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7EB5F20738 for ; Sun, 2 Aug 2020 10:58:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596365907; bh=MOrzMj2W55UJKJyvuXI+G/4EBNaq8w1o1Kkvy6T/r2k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=U5Nfx+saov5s0kjGvNw+XkOE1/DOy5Im89C2sC3UWEcjsEZzfPxUZxeWsGPtBL6+q KXRVtx7agbtm7zzo9n58ho8bM7Ubw6xzWNfACJyksoxxDMK0fvUTCMzhNeIdrl7tFI Pr6//P5kpAcyXGFsz1PP1CuMza7YtPWPQIgldpEI= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728062AbgHBK60 (ORCPT ); Sun, 2 Aug 2020 06:58:26 -0400 Received: from mail.kernel.org ([198.145.29.99]:36828 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726765AbgHBK60 (ORCPT ); Sun, 2 Aug 2020 06:58:26 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 136C020738; Sun, 2 Aug 2020 10:58:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596365905; bh=MOrzMj2W55UJKJyvuXI+G/4EBNaq8w1o1Kkvy6T/r2k=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=JzBSDUgWdyzOLKpSKMOlE16XUzUVspN0ZmE9otAJGyosykI2/eLOjQSykhqPY0vgw f7D7uP/xQ2VXsJlsivi6B+zgfOaGvVrLO3hV2OAn19dIKlYHM4l0Ndl4ft2padKoKZ s2cUzeqK0bwnClj3LrW9rKKsJwYIONXivcrj+rlQ= Date: Sun, 2 Aug 2020 12:58:08 +0200 From: Greg Kroah-Hartman To: Andy Shevchenko Cc: kernel test robot , Andy Shevchenko , LKML , "open list:SERIAL DRIVERS" , lkp@lists.01.org Subject: Re: [serial] 679193b7ba: BUG:spinlock_bad_magic_on_CPU Message-ID: <20200802105808.GA164531@kroah.com> References: <20200802054852.GR23458@shao2-debian> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Sun, Aug 02, 2020 at 01:50:29PM +0300, Andy Shevchenko wrote: > On Sun, Aug 2, 2020 at 8:54 AM kernel test robot wrote: > > > > Greeting, > > > > FYI, we noticed the following commit (built with gcc-9): > > > > commit: 679193b7baf8d88e41cbeb397ca17f797654947d ("serial: 8250: Let serial core initialise spin lock") > > https://git.kernel.org/cgit/linux/kernel/git/gregkh/tty.git tty-next > > > > > > in testcase: boot > > > > on test machine: qemu-system-x86_64 -enable-kvm -cpu SandyBridge -smp 2 -m 16G > > > > caused below changes (please refer to attached dmesg/kmsg for entire log/backtrace): > > > > > > +-------------------------------+------------+------------+ > > | | f3af1b68fc | 679193b7ba | > > +-------------------------------+------------+------------+ > > | boot_successes | 4 | 0 | > > | boot_failures | 0 | 4 | > > | BUG:spinlock_bad_magic_on_CPU | 0 | 4 | > > +-------------------------------+------------+------------+ > > > > > > If you fix the issue, kindly add following tag > > Reported-by: kernel test robot > > Thanks for the report. I didn't see it on real hardware though. Maybe > because of timing (race?) differences. > > Greg, I think the best is to revert the change until I will have better one. Can you send me a revert patch with the reported-by: set up? thanks, greg k-h