Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
        id S1751077AbcKEWkO (ORCPT <rfc822;w@1wt.eu>);
        Sat, 5 Nov 2016 18:40:14 -0400
Received: from mail-wm0-f65.google.com ([74.125.82.65]:35883 "EHLO
        mail-wm0-f65.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
        with ESMTP id S1750820AbcKEWkM (ORCPT
        <rfc822;linux-kernel@vger.kernel.org>);
        Sat, 5 Nov 2016 18:40:12 -0400
To: lkml <linux-kernel@vger.kernel.org>
Cc: tglx@linutronix.de, mingo@kernel.org
From: Gabriel C <nix.or.die@gmail.com>
Subject: Linux 4.9-rcX: rcu_preempt detected stalls on CPUs/tasks messages
Message-ID: <34665aff-45cf-11b8-8b0f-21e9e3a89205@gmail.com>
Date: Sat, 5 Nov 2016 23:38:50 +0100
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101
 Thunderbird/45.4.0
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
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: 2934
Lines: 50

Hello ,


I've tested 4.9-rcX and Linus git tree and have on this box the following messages :

.....

Nov 05 20:26:40 zwerg kernel: INFO: rcu_preempt detected stalls on CPUs/tasks:
Nov 05 20:26:40 zwerg kernel:         Tasks blocked on level-0 rcu_node (CPUs 0-15): P0
Nov 05 20:26:40 zwerg kernel:         (detected by 8, t=60002 jiffies, g=2426, c=2425, q=789)
Nov 05 20:26:40 zwerg kernel: swapper/0       R  running task        0     0      0 0x00200000
Nov 05 20:26:40 zwerg kernel:  0000000000000000 ffff88043fc0c6c0 ffffffff810ca25e 0000000000000004
Nov 05 20:26:40 zwerg kernel:  0000000000000002 0000000000000003 0000000000000010 ffffffff814b936f
Nov 05 20:26:40 zwerg kernel:  ffff88043fc1d600 ffffffff81893f00 0000000000000003 ffffffff81893de0
Nov 05 20:26:40 zwerg kernel: Call Trace:
Nov 05 20:26:40 zwerg kernel:  [<ffffffff810ca25e>] ? __tick_broadcast_oneshot_control+0x5e/0x220
Nov 05 20:26:40 zwerg kernel:  [<ffffffff814b936f>] ? intel_idle+0xef/0xfe
Nov 05 20:26:40 zwerg kernel:  [<ffffffff813d3b45>] ? cpuidle_enter_state+0x125/0x200
Nov 05 20:26:40 zwerg kernel:  [<ffffffff81096e0f>] ? cpu_startup_entry+0x13f/0x230
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9e69>] ? start_kernel+0x428/0x430
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9120>] ? early_idt_handler_array+0x120/0x120
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e937a>] ? x86_64_start_kernel+0xef/0xfe
Nov 05 20:26:40 zwerg kernel: swapper/0       R  running task        0     0      0 0x00200000
Nov 05 20:26:40 zwerg kernel:  0000000000000000 ffff88043fc0c6c0 ffffffff810ca25e 0000000000000004
Nov 05 20:26:40 zwerg kernel:  0000000000000002 0000000000000003 0000000000000010 ffffffff814b936f
Nov 05 20:26:40 zwerg kernel:  ffff88043fc1d600 ffffffff81893f00 0000000000000003 ffffffff81893de0
Nov 05 20:26:40 zwerg kernel: Call Trace:
Nov 05 20:26:40 zwerg kernel:  [<ffffffff810ca25e>] ? __tick_broadcast_oneshot_control+0x5e/0x220
Nov 05 20:26:40 zwerg kernel:  [<ffffffff814b936f>] ? intel_idle+0xef/0xfe
Nov 05 20:26:40 zwerg kernel:  [<ffffffff813d3b45>] ? cpuidle_enter_state+0x125/0x200
Nov 05 20:26:40 zwerg kernel:  [<ffffffff81096e0f>] ? cpu_startup_entry+0x13f/0x230
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9e69>] ? start_kernel+0x428/0x430
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e9120>] ? early_idt_handler_array+0x120/0x120
Nov 05 20:26:40 zwerg kernel:  [<ffffffff818e937a>] ? x86_64_start_kernel+0xef/0xfe

.....

When I boot to console mode the system seems to work at least when I'm loggen in from tty1.
Switching to other tty's sometimes works sometimes not.. Starting X makes the box hang.. sddm starts but I
never get to the logn screen. After some minutes I have to hard reset the box..

Latest tested git kernel is 4.9.0-rc3-00429-g03daa36 , the box is a FUJITSU PRIMERGY TX200 S5.

config used and dmesg can be found there :

http://ftp.frugalware.org/pub/other/people/crazy/kernel/

Best Regards

Gabriel C