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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,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 771A5C6778A for ; Mon, 9 Jul 2018 11:25:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 32FED20896 for ; Mon, 9 Jul 2018 11:25:42 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 32FED20896 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=linux.intel.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932866AbeGILZj (ORCPT ); Mon, 9 Jul 2018 07:25:39 -0400 Received: from mga01.intel.com ([192.55.52.88]:50038 "EHLO mga01.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932528AbeGILZh (ORCPT ); Mon, 9 Jul 2018 07:25:37 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga005.jf.intel.com ([10.7.209.41]) by fmsmga101.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 09 Jul 2018 04:25:37 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.51,330,1526367600"; d="scan'208";a="238889405" Received: from smile.fi.intel.com (HELO smile) ([10.237.72.86]) by orsmga005.jf.intel.com with ESMTP; 09 Jul 2018 04:25:34 -0700 Message-ID: <79db809d74dcbe84b7ed3001dd7c82649227783a.camel@linux.intel.com> Subject: Re: droid 4 in v4.18-rc: grep -r adasfasd /sys/ oopses From: Andy Shevchenko To: Pavel Machek , kernel list , linux-arm-kernel , linux-omap@vger.kernel.org, tony@atomide.com, sre@kernel.org, nekit1000@gmail.com, mpartap@gmx.net, merlijn@wizzup.org Cc: "Rafael J. Wysocki" , Linux-pm mailing list Date: Mon, 09 Jul 2018 14:25:33 +0300 In-Reply-To: <20180709104943.GA5212@amd> References: <20180708174939.GA10002@amd> <20180708193720.GA13262@amd> <20180709102852.GA20580@amd> <20180709104943.GA5212@amd> Organization: Intel Finland Oy Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.28.1-2 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2018-07-09 at 12:49 +0200, Pavel Machek wrote: > Hi! > > > > > grep in /sys produces a nasty oops: > > > > > > > > I guess next step is trying to find out which file that is.. > > > > > > Let me see... > > > > > > openat(6, "suspend", > > > O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 > > > fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0 > > > read(4, 0x4d2000, 32768) = -1 EINVAL (Invalid > > > argument) > > > write(2, "grep: ", 6grep: ) = 6 > > > write(2, "/sys/kernel/debug/pm_debug/cefus"..., > > > 47/sys/kernel/debug/pm_debug/cefuse_pwrdm/suspend) = 47 > > > write(2, ": Invalid argument", 18: Invalid argument) = 18 > > > write(2, "\n", 1 > > > ) = 1 > > > close(4) = 0 > > > close(6) = 0 > > > openat(5, "time", > > > O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) > > > = 4 > > > fstat64(4, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0 > > > read(4, "cefuse_pwrdm (OFF),OFF:641441757"..., 32768) = 849 > > > read(4, "", 28672) = 0 > > > close(4) = 0 > > > openat(5, "count", > > > O_RDONLY|O_NOCTTY|O_NONBLOCK|O_LARGEFILE|O_NOFOLLOW) = 4 > > > Connection to usb closed by remote host. > > > Connection to usb closed. > > > pavel@half:~$ > > > > > > Ok, so it seems to be: > > > > > > user@devuan:~$ cat /sys/kernel/debug/pm_debug/count > > > (oops). > > > > > > The file seems to be world-readable. > > > > > > user@devuan:~$ ls -al /sys/kernel/debug/pm_debug/count > > > -r--r--r-- 1 root root 0 Jan 1 1970 > > > /sys/kernel/debug/pm_debug/count > > > > > > But on PC, that file does not exist. > > > > Ok, it is easier to reproduce like this: > > > > sudo mount /dev/zero -t debugfs /sys/kernel/debug/ > > sudo cat /sys/kernel/debug/pm_debug/count > > > > I tried adding debugging like this: > > Confused. > > > > seq_printf(s, "%s->%s (%d)\n", clkdm->name, clkdm- > > >pwrdm.ptr->name, > > clkdm->usecount); > > I replaced seq_prinf with printk, and it still crashes, after > producing reasonable output. > You need to add printk to the show function as well. It might be last item in the list which is problematic (or one after cefuse CLK domain. > [ 74.852508] cmp... > [ 74.855773] printf... > [ 74.859313] l4_cfg_clkdm->core_pwrdm (0) > [ 74.864532] done... > [ 74.867889] cmp... > [ 74.871154] printf... > [ 74.874694] l4_cefuse_clkdm->cefuse_pwrdm (0) > [ 74.880340] done... > [ 74.883728] ------------[ cut here ]------------ > [ 74.889709] WARNING: CPU: 0 PID: 2127 at > drivers/bus/omap_l3_noc.c:147 l3_interrupt_handler+0x23c/0x380 > [ 74.900695] 44000000.ocp:L3 Custom Error: MASTER MPU TARGET L4PER2 > (Read): Data Access in User mode during Functional access > [ 74.915222] Modules linked in: > [ 74.919982] CPU: 0 PID: 2127 Comm: cat Not tainted > 4.18.0-rc4-88970-gf075a2c-dirty #763 > [ 74.929870] Hardware name: Generic OMAP4 (Flattened Device Tree) > [ 74.937805] [] (unwind_backtrace) from [] > (show_stack+0x10/0x14) > > > Pavel -- Andy Shevchenko Intel Finland Oy