linux-kernel - Re: BUG: rcu_sched detected stalls on CPUs

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Date:   Sat, 21 Jan 2017 09:09:15 +0200
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?

It's happened usual once per day and can't be reproducible. If server 
load average is more then
0.70 it's will happened twice per day.

> 
>> 
>> [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 Have you tried a newer version of the kernel?

No, for the moment I didnt because I can't find new one in slackware 
repos.
My last kernel compile was almost 7 years ago and I do not feel safe 
now, I guess a lot of things have changed.


> 
> -- Steve

Regards,
Mitko