From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752856AbdEHGuS (ORCPT ); Mon, 8 May 2017 02:50:18 -0400 Received: from stz-bg.com ([46.40.123.212]:49766 "EHLO mail.stzbg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750797AbdEHGuQ (ORCPT ); Mon, 8 May 2017 02:50:16 -0400 X-Greylist: delayed 411 seconds by postgrey-1.27 at vger.kernel.org; Mon, 08 May 2017 02:50:15 EDT MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Date: Mon, 08 May 2017 09:43:15 +0300 From: mitko@stz-bg.com To: Steven Rostedt Cc: "Paul E. McKenney" , Josh Triplett , linux-kernel@vger.kernel.org, Mathieu Desnoyers , Lai Jiangshan Subject: Re: BUG: rcu_sched detected stalls on CPUs In-Reply-To: <20170120101912.00498a6e@gandalf.local.home> References: <20170120101912.00498a6e@gandalf.local.home> Message-ID: <9976847ad11196cfb6a586217c1bc523@stz-bg.com> User-Agent: Roundcube Webmail/1.2.5 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 2017-01-20 17:19, Steven Rostedt wrote: > On Fri, 20 Jan 2017 10:43:50 +0200 > mitko@stz-bg.com wrote: > >> [1.] One line summary of the problem: >> >> rcu_sched detected stalls on CPUs and few minutes server not respond. > > Is this reproducible? Or was this a one time ordeal? > >> >> [2.] Full description of the problem/report: >> >> Load of my server (postgres database) isnt big less then 0.50 and when >> error occured rcu_sched detected stalls on CPUs >> server freeze and nothing is work for 3-5 minute. >> No network, no video signal, no keyboard, no mouse. Nothing is worked. >> After these few minutes everything continue normal. >> This usual is happend once per day. When I check in google find a lots >> of ppl complain of this error, but no solution. >> Do any one know can help me to resolve it ? I spoke with few friends >> and >> they trying to convince me the problem is in CPU. >> I did not believe after a 3 years working CPU suddenly stop working >> correctly, but I might be wrong. >> >> [3.] Keywords (i.e., modules, networking, kernel): >> >> kernel >> >> [4.] Kernel information >> [4.1.] Kernel version (from /proc/version): >> >> Linux version 4.4.38 (root@hive64) (gcc version 5.4.0 (GCC) ) #2 SMP >> Sun >> Dec 11 16:11:02 CST 2016 >> > > Have you tried a newer version of the kernel? > > -- Steve Hello, yesterday I change to new kernel: 4.9.26 and still no effect. I trying to figure out what I need to buy because I read on google a lots of posts about that problem, some ppl suggest is BIOS firmware bug, some ppl tell that when they swap CPU problem is resolved. May be problem was started when I first time boot 4.x kernel and there have cpu microcode updates. Im 3.x kernels this feature was not in kernel, but I don't know, only guess. Can some one point me clearly: You need to change this one and problem will be solved ? [239940.067938] clocksource: timekeeping watchdog on CPU26: Marking clocksource 'tsc' as unstable because the skew is too large: [239940.067943] clocksource: 'hpet' wd_now: ecb521ce wd_last: ca45912d mask: ffffffff [239940.067946] clocksource: 'tsc' cs_now: 2d12df5f88d08 cs_last: 29fffbe2d36d6 mask: ffffffffffffffff [239940.068357] clocksource: Switched to clocksource hpet [240000.066457] INFO: rcu_sched detected stalls on CPUs/tasks: [240000.066488] 2-...: (38 GPs behind) idle=f1a/0/0 softirq=2417028/2417028 fqs=0 [240000.066491] 3-...: (27 GPs behind) idle=0bc/0/0 softirq=3076046/3076047 fqs=0 [240000.066494] 4-...: (1006 GPs behind) idle=308/0/0 softirq=1474922/1474922 fqs=0 [240000.066497] 5-...: (8034 GPs behind) idle=7b4/0/0 softirq=69165/69166 fqs=0 [240000.066499] 6-...: (1665 GPs behind) idle=716/0/0 softirq=16465/16465 fqs=0 [240000.066502] 7-...: (8034 GPs behind) idle=bd0/0/0 softirq=15923/15924 fqs=0 [240000.066505] 8-...: (1665 GPs behind) idle=a62/0/0 softirq=93861/93861 fqs=0 [240000.066507] 9-...: (1258 GPs behind) idle=a8c/0/0 softirq=21608/21608 fqs=0 [240000.066510] 11-...: (1665 GPs behind) idle=8e6/0/0 softirq=18844/18844 fqs=0 [240000.066512] 13-...: (1665 GPs behind) idle=ab8/0/0 softirq=21278/21278 fqs=0 [240000.066515] 14-...: (4854 GPs behind) idle=578/0/0 softirq=25624/25626 fqs=0 [240000.066517] 15-...: (8034 GPs behind) idle=f5e/0/0 softirq=18114/18115 fqs=0 [240000.066520] 16-...: (1665 GPs behind) idle=b66/0/0 softirq=19511/19511 fqs=0 [240000.066528] 17-...: (0 ticks this GP) idle=e18/0/0 softirq=16163/16163 fqs=0 [240000.066531] 18-...: (1665 GPs behind) idle=a18/0/0 softirq=16424/16424 fqs=0 [240000.066533] 19-...: (1665 GPs behind) idle=944/0/0 softirq=17920/17920 fqs=0 [240000.066549] 20-...: (20991 GPs behind) idle=750/0/0 softirq=17549/17552 fqs=0 [240000.066552] 21-...: (0 ticks this GP) idle=9e0/0/0 softirq=18937/18937 fqs=0 [240000.066555] 22-...: (14519 GPs behind) idle=95e/0/0 softirq=16122/16124 fqs=0 [240000.066557] 23-...: (1665 GPs behind) idle=bbc/0/0 softirq=16316/16316 fqs=0 [240000.066560] 24-...: (0 ticks this GP) idle=c56/0/0 softirq=20070/20070 fqs=0 [240000.066563] 27-...: (8034 GPs behind) idle=bdc/0/0 softirq=18291/18292 fqs=0 [240000.066566] 28-...: (8034 GPs behind) idle=4f8/0/0 softirq=22313/22314 fqs=0 [240000.066568] 29-...: (3443 GPs behind) idle=22a/0/0 softirq=24975/24976 fqs=0 [240000.066571] 30-...: (1665 GPs behind) idle=940/0/0 softirq=89382/89382 fqs=0 [240000.066572] (detected by 10, t=60002 jiffies, g=4843721, c=4843720, q=659) [240000.066578] Task dump for CPU 2: [240000.066581] swapper/2 R running task 0 0 1 0x00200000 [240000.066588] 0000000000000083 ffffffffa5cecd79 ffff8aca3eea1e00 ffffffffa64cab40 [240000.066593] 0000000000000005 ffffffffa64cad38 ffffa96c80073eb0 ffffffffa5ba9d93 [240000.066597] ffff8aca3eea1e00 000000000e94fec6 ffff8aca38535940 0000000000000002 [240000.066601] Call Trace: [240000.066617] [] ? intel_idle+0x109/0x110 [240000.066625] [] ? cpuidle_enter_state+0x103/0x2b0 [240000.066629] [] ? cpuidle_enter+0x17/0x20 [240000.066638] [] ? call_cpuidle+0x23/0x40 [240000.066641] [] ? cpu_startup_entry+0x147/0x220 [240000.066647] [] ? start_secondary+0x12d/0x140 [240000.066650] Task dump for CPU 3: [240000.066651] swapper/3 R running task 0 0 1 0x00200000 Regards, Mitko