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=-10.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham 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 84105C433E0 for ; Wed, 13 Jan 2021 12:25:47 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2CD6B2313C for ; Wed, 13 Jan 2021 12:25:47 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726386AbhAMMZq (ORCPT ); Wed, 13 Jan 2021 07:25:46 -0500 Received: from mail.kernel.org ([198.145.29.99]:55930 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725613AbhAMMZp (ORCPT ); Wed, 13 Jan 2021 07:25:45 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 0FB7F2313C; Wed, 13 Jan 2021 12:25:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610540704; bh=NJhusBOJQfLJVcAsWbNlHy8AAl5d7ZzV9WwA4RE4ZvQ=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=bLGbaaFOZvSLAuyEmoradN4wPB+5W5oHw1J6uUrAX0fDxfIN1ETRwNLdFMSi+NppK rTYVOnPbzWWLXIwaU2lDhkoZxzAMEbFe8ucYiJLtCmH5WDREcMo3EEOGPs3PcVDiOd nfg1TX8kVz7AYfREiehweAR4rQMsaR3P67GO5pO0= Date: Wed, 13 Jan 2021 13:26:11 +0100 From: Greg Kroah-Hartman To: Pintu Agarwal Cc: open list , "moderated list:ARM/FREESCALE IMX / MXC ARM ARCHITECTURE" , landy.gross@linaro.org, David Brown , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, indranilghsh428@gmail.com, stephen@networkplumber.org Subject: Re: [BUG]: Kernel 4.9: Kernel crash at fs/sysfs/file.c : sysfs_kf_seq_show Message-ID: References: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jan 13, 2021 at 05:35:18PM +0530, Pintu Agarwal wrote: > On Tue, 12 Jan 2021 at 17:39, Greg Kroah-Hartman > wrote: > > > > On Tue, Jan 12, 2021 at 05:31:54PM +0530, Pintu Agarwal wrote: > > > Hi, > > > > > > I am using Kernel: 4.9.217 for one of the ARM32 boards for Qualcomm SOC. > > > https://github.com/android-linux-stable/msm-4.9 > > > > > > But I think this is a general bug applicable to :Kernel 4.9 under > > > fs/sysfs/file.c > > > So, I wanted to quickly check here if others are familiar with this > > > issue and if it is fixed already. > > > Note, this issue does not occur in 4.14 Kernel. > > > > > > When I execute below command, the Kernel is crashing. > > > I tried to add few debug prints to find more details. I see that the > > > ops->show pointer is not valid (seems corrupted). > > > So I wanted to understand how this can happen only for this particular node. > > > Other sysfs entries are working fine. > > > > > I see that this issue was reported earlier as well by others. > https://syzkaller.appspot.com/bug?id=2ec2a9da5c711df3d3d12071bac487b96e75e103 > https://gitlab.freedesktop.org/drm/amd/-/issues/413 > https://bugzilla.redhat.com/show_bug.cgi?id=1615070 > > So it seems to be common issue and thus I wanted to check here if its similar. It's "common" in that this is core kernel code that any number of drivers could be causing to work incorrectly. Try fixing up the driver code, and odds are, that will fix this issue. good luck, and again, go ask for support from your vendor, you are paying for that! greg k-h