Date:   Mon, 08 May 2017 09:43:15 +0300
From:   mitko@...-bg.com
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Josh Triplett <josh@...htriplett.org>,
        linux-kernel@...r.kernel.org,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: BUG: rcu_sched detected stalls on CPUs

On 2017-01-20 17:19, Steven Rostedt wrote:
> On Fri, 20 Jan 2017 10:43:50 +0200
> mitko@...-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@...e64) (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 Have you tried a newer version of the kernel?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]  [<ffffffffa5cecd79>] ? intel_idle+0x109/0x110
[240000.066625]  [<ffffffffa5ba9d93>] ? cpuidle_enter_state+0x103/0x2b0
[240000.066629]  [<ffffffffa5ba9f77>] ? cpuidle_enter+0x17/0x20
[240000.066638]  [<ffffffffa50d5d73>] ? call_cpuidle+0x23/0x40
[240000.066641]  [<ffffffffa50d5fd7>] ? cpu_startup_entry+0x147/0x220
[240000.066647]  [<ffffffffa503ecfd>] ? start_secondary+0x12d/0x140
[240000.066650] Task dump for CPU 3:
[240000.066651] swapper/3       R  running task        0     0      1 
0x00200000

Regards,
Mitko

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