Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751220AbdLUPBg (ORCPT <rfc822;w@1wt.eu>);
        Thu, 21 Dec 2017 10:01:36 -0500
Received: from mail.monom.org ([188.138.9.77]:33582 "EHLO mail.monom.org"
        rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
        id S1751424AbdLUPBf (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
        Thu, 21 Dec 2017 10:01:35 -0500
Subject: Re: [v4.14-rt][report] arm: run: stress-ng --class os --all 0 -t 5m
To: Grygorii Strashko <grygorii.strashko@ti.com>
Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Steven Rostedt <rostedt@goodmis.org>,
        linux-rt-users <linux-rt-users@vger.kernel.org>,
        LKML <linux-kernel@vger.kernel.org>
References: <e421665a-8438-a1c0-4516-1b23dc758fc8@ti.com>
 <20171219082739.d6oxzkjkdicfu3hq@linutronix.de>
 <40bb8ed5-d0e7-72e8-ab20-89431263af48@ti.com>
From: Daniel Wagner <wagi@monom.org>
Message-ID: <f7351d16-ed63-b47d-ac9c-db194e2934f0@monom.org>
Date: Thu, 21 Dec 2017 16:01:30 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101
 Thunderbird/52.5.0
MIME-Version: 1.0
In-Reply-To: <40bb8ed5-d0e7-72e8-ab20-89431263af48@ti.com>
Content-Type: text/plain; charset=utf-8
Content-Language: en-US
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org
Content-Length: 2106
Lines: 35

Hi Grygorii,

On 12/20/2017 01:33 AM, Grygorii Strashko wrote:

> I've run test few times - can't see "WARNING: possible circular locking dependency detected"
> any more. Below warning happened once.
> 
> [ 3091.593894] ------------[ cut here ]------------
> [ 3091.593909] WARNING: CPU: 0 PID: 1797 at kernel/rcu/tree_plugin.h:310 rcu_note_context_switch+0x554/0x950
> [ 3091.593912] Modules linked in:
> [ 3091.593923] CPU: 0 PID: 1797 Comm: stress-ng-clock Not tainted 4.14.6-rt7-dirty #37
> [ 3091.593926] Hardware name: Generic DRA74X (Flattened Device Tree)
> [ 3091.593941] [<c0110090>] (unwind_backtrace) from [<c010c710>] (show_stack+0x10/0x14)
> [ 3091.593952] [<c010c710>] (show_stack) from [<c08388b8>] (dump_stack+0xa0/0xd4)
> [ 3091.593964] [<c08388b8>] (dump_stack) from [<c013668c>] (__warn+0xd8/0x104)
> [ 3091.593975] [<c013668c>] (__warn) from [<c0136764>] (warn_slowpath_null+0x20/0x28)
> [ 3091.593984] [<c0136764>] (warn_slowpath_null) from [<c01b8efc>] (rcu_note_context_switch+0x554/0x950)
> [ 3091.593996] [<c01b8efc>] (rcu_note_context_switch) from [<c084e08c>] (__schedule+0xc4/0xa7c)
> [ 3091.594005] [<c084e08c>] (__schedule) from [<c084eaa4>] (schedule+0x60/0xf8)
> [ 3091.594016] [<c084eaa4>] (schedule) from [<c08505b4>] (rt_spin_lock_slowlock_locked+0xa8/0x304)
> [ 3091.594026] [<c08505b4>] (rt_spin_lock_slowlock_locked) from [<c0851060>] (__read_rt_lock+0xc0/0xf4)
> [ 3091.594036] [<c0851060>] (__read_rt_lock) from [<c01398cc>] (pin_current_cpu+0x3c/0x11c)
> [ 3091.594047] [<c01398cc>] (pin_current_cpu) from [<c0167ce0>] (migrate_disable+0x78/0x1e8)
> [ 3091.594057] [<c0167ce0>] (migrate_disable) from [<c085248c>] (rt_spin_lock+0x14/0x4c)
> [ 3091.594066] [<c085248c>] (rt_spin_lock) from [<c01cb150>] (__lock_timer+0xc0/0x220)
> [ 3091.594076] [<c01cb150>] (__lock_timer) from [<c01cc2b8>] (SyS_timer_gettime+0x14/0xb8)
> [ 3091.594087] [<c01cc2b8>] (SyS_timer_gettime) from [<c01079c8>] (__sys_trace_return+0x0/0x10)
> [ 3091.594091] ---[ end trace 0000000000000002 ]---

Known problem:

https://marc.info/?l=linux-rt-users&m=151206631210170&w=2

Thanks,
Daniel