Dear, It is either one of the task hold and time out due to system memory resource management of Linux

Explain By default Linux uses up to 40% of the available memory for file system caching. After this mark has been reached the file system flushes all outstanding data to disk causing all following IOs going synchronous. For flushing out this data to disk this there is a time limit of 120 seconds by default. In the case here the IO subsystem is not fast enough to flush the data withing 120 seconds. As IO subsystem responds slowly and more requests are served, System Memory gets filled up resulting in the above error, thus serving HTTP requests.

Source --> https://www.blackmoreops.com/2014/09/22/linux-kernel-panic-issue-fix-hung_ta sk_timeout_secs-blocked-120-seconds-problem/

Hope that helps! Xlord

-----Original Message----- From: CentOS-virt [mailto:centos-virt-bounces@centos.org] On Behalf Of Gokan Atmaca Sent: Wednesday, December 7, 2016 10:16 PM To: Discussion about the virtualization on CentOS centos-virt@centos.org Subject: Re: [CentOS-virt] vm.dirty_ratio

Please check if there is also error log contained OOM kill?

It does not appear.

On Wed, Dec 7, 2016 at 4:41 PM, -=X.L.O.R.D=- xlord.sl@gmail.com wrote:

Dear, Please check if there is also error log contained OOM kill?

Xlord

-----Original Message----- From: CentOS-virt [mailto:centos-virt-bounces@centos.org] On Behalf Of Gokan Atmaca Sent: Wednesday, December 7, 2016 9:16 PM To: Discussion about the virtualization on CentOS centos-virt@centos.org Subject: [CentOS-virt] vm.dirty_ratio

Hello

I get the following error on the server. The problem is resolved when you restart. But is this causing the problem?

messages_log: INFO: task jbd2/dm-1-8:674 blocked for more than 120 seconds echo 0 > /proc/sys/kernel/hung_task_timeout_secs

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