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=-1.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,SUBJ_ALL_CAPS,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 1F22BC432C3 for ; Tue, 3 Dec 2019 12:03:09 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E57EF2068E for ; Tue, 3 Dec 2019 12:03:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575374589; bh=X3xxWWIPEUious9vCNNY5FmVrTaTZ1isVPGSJ+SVmvE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=N1319V1f7DygB6PoVw/Yk1+SWcWEeDhHX6HcCL0c+sEWPs0CrdzBqn4LcFNUSDH7A aqQ2SNE8Yrlu47uH4ROmdrdlKgweVAv/aGsuAUEuhVUthVAi3hvvQtVurNw6shDtGv 7V+PQRFc1CcqPDWaGjIzUZq/Fh53KN/Ix5K8a3Ho= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726674AbfLCMDI (ORCPT ); Tue, 3 Dec 2019 07:03:08 -0500 Received: from mail.kernel.org ([198.145.29.99]:40398 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725954AbfLCMDH (ORCPT ); Tue, 3 Dec 2019 07:03:07 -0500 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 04D872068E; Tue, 3 Dec 2019 12:03:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1575374586; bh=X3xxWWIPEUious9vCNNY5FmVrTaTZ1isVPGSJ+SVmvE=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=mRwFLE5SiCcv4UB1m9HGKPNV7kwg7Z58Zi2nNNXc94MJRyYtkmHQgjs6tZ7tyv0FS zfJxyXEev4XRO1uJUIAsvBpytUBUmxO+KlVHQLUy15duz6PSpFm+3NeQhuqAVmUmdf tan0usNmmWpILPrTssIozou+ssfjSom5WjlAcMxg= Date: Tue, 3 Dec 2019 13:03:04 +0100 From: Greg KH To: Amol Grover Cc: stable@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: Re: [STABLE TEST] 5.3.13 Message-ID: <20191203120304.GA2126088@kroah.com> References: <20191203062503.GA3467@workstation-kernel-dev> <20191203064052.GA1788679@kroah.com> <20191203071415.GA9640@workstation-portable> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20191203071415.GA9640@workstation-portable> User-Agent: Mutt/1.12.2 (2019-09-21) Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org On Tue, Dec 03, 2019 at 12:44:15PM +0530, Amol Grover wrote: > On Tue, Dec 03, 2019 at 07:40:52AM +0100, Greg KH wrote: > > On Tue, Dec 03, 2019 at 11:55:03AM +0530, Amol Grover wrote: > > > Compiled, Booted, however I'm getting the following errors when running > > > "make kselftest" > > > > > > sudo dmesg -l alert > > > > > > [34381.903893] BUG: kernel NULL pointer dereference, address: 0000000000000008 > > > [34381.903904] #PF: supervisor read access in kernel mode > > > [34381.903908] #PF: error_code(0x0000) - not-present page > > > > Which test causes this problem? > > IIRC I didn't run make kselftest with summary=1 option. Is there any > other way to get that information? The logs that kselftest generated > also don't seem to help in this. Watch the output when you run this? I don't know, try re-running it with that option. > > ANd is it new in 5.3.13? > > > > I previously ran kselftest on 5.4-rc7 and 5.3.9 (default kernel shipped > by openSUSE), both were fine. However, a bit of backstory: > > A day ago I used kselftest from the linux/next branch and ran it (w/o > sudo). It showed me the exact same error. However, I was running a > modified version of 5.3.13, but those modifications were actually > trivial (5 lines changed) and shouldn't have resulted in this kernel > error. So, I switched to the vanilla 5.3.13 and ran kselftest (w/o sudo) > again. I ran it 3 times (w/o any errors), switched back to the modified > kernel and ran kselftest (w/o root) 2 more times and everything was > fine. Then I decided to test the vanilla one again for the 4th time, but > this time I ran kselftest as root where this BUG popped again. Try a kernel.org 5.3.9 and if that works, then try 5.3.13 and if that fails, run 'git bisect' and try to find the offending kernel commit. thanks, greg k-h