[Freeswitch-users] 100% CPU usage

Wed Mar 22 14:20:14 MSK 2017

@Shuan, yes we are using the session:ready() method before we execute.
We are running all of our servers virtually and never had any issues up until now.
This same application ran on older versions of freeswitch without issues, even during and after high load.

@Antonio, thanks for the tips! I’ll have a look and try some stuff.

From: freeswitch-users-bounces at lists.freeswitch.org [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Antonio Silva
Sent: woensdag 22 maart 2017 10:09
To: freeswitch-users at lists.freeswitch.org
Subject: Re: [Freeswitch-users] 100% CPU usage

We had some issues using pcall functions like io.popen when trying to execute external commands, that block mod_lua, i end up replacing that with os.execute.

Recently i also had some issue with cpu hitting 100%,for what i could compile from debugging was something related with malloc calls. after compiling fs with tcmalloc the issue disappear, you could try this approach as well.

You can check jira: https://freeswitch.org/jira/browse/FS-9957 and  also in the malling: "CPU sys load issue"  for more info.

Regards,
António
On 03/22/2017 09:52 AM, Shaun Stokes wrote:
Are you using ‘if (session:ready()) then’ in your scripts before you execute?

Are you using virtual or physical hardware and what spec?

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Grant Bagdasarian
Sent: 22 March 2017 07:31
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org><mailto:freeswitch-users at lists.freeswitch.org>
Subject: Re: [Freeswitch-users] 100% CPU usage

Anthony, we triple checked the script and its dependencies. There are no loops at all in the script. The imported scripts are also written by us and they too do not contain any loops.
It’s just basic call handling with some playback and play_and_get_digits calls, and some pcall calls to query a database.

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: dinsdag 21 maart 2017 16:02
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] 100% CPU usage

I already told you why a week ago.  Your script most likely has an endless loop in it that does not check the condition session:ready()

However, Feel free to contact consulting at freeswitch.org<mailto:consulting at freeswitch.org> and we can formally diagnose it for a fee.

On Tue, Mar 21, 2017 at 6:42 AM Grant Bagdasarian <gb at cm.nl<mailto:gb at cm.nl>> wrote:
Attached are the logs for:

#check thread usage:

top -p $(cat /var/run/freeswitch/freeswitch.pid) -H -b -n 1

#memory mapping:

cat /proc/$(cat /var/run/freeswitch/freeswitch.pid)/maps

We’re unable to run gcore since freeswitch hogs all available cpu’s at 100%.
I tried changing the nice settings real-time but that didn’t work either.

At one point we had a huge spike in inbound traffic towards our freeswitch (valid traffic).
The traffic is handled by a lua application.
What we saw was calls hanging in freeswitch while they’ve already been physically disconnected.
After the huge spike freeswitch behaved normally for a couple of minutes and then suddenly started eating all the available cpu cores at 100%.

We have some db queries which are fired in the lua application, so these may cause the application to hang, but we haven’t reproduced it yet.

I’ll setup a test lab with the same configuration and fire sipp at it to see if I can reproduce the issue.
However, I probably won’t be able to run gcore for debugging. Any other suggestions?

Also we saw a lot of open udp ports and some had a huge read buffer size which did not decrease.

[cid:image001.png at 01D2A238.14965330]

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org>] On Behalf Of Grant Bagdasarian
Sent: maandag 13 maart 2017 09:04

To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] 100% CPU usage

Hi Antony and Antonio,

Thank you for the tips.
We haven’t had freeswitch going berserk anymore (not sure as to why it did perform without issue over the weekend), but will continue to monitor it and run the commands to trace the issue.

Regards,

Grant

From: freeswitch-users-bounces at lists.freeswitch.org<mailto:freeswitch-users-bounces at lists.freeswitch.org> [mailto:freeswitch-users-bounces at lists.freeswitch.org] On Behalf Of Anthony Minessale
Sent: zaterdag 11 maart 2017 00:07
To: FreeSWITCH Users Help <freeswitch-users at lists.freeswitch.org<mailto:freeswitch-users at lists.freeswitch.org>>
Subject: Re: [Freeswitch-users] 100% CPU usage

Make sure you lua script has all while loops including session:ready() as a condition to continue.  Its a common mistake that leads to loops spinning out of control on hungup channels.

On Fri, Mar 10, 2017 at 6:11 AM, Antonio Silva <asilva at wirelessmundi.com<mailto:asilva at wirelessmundi.com>> wrote:
Hi,

You can use the following commands:

#get a core:

gcore -o /home/gcore-$(date +%s) $(cat /var/run/freeswitch/freeswitch.pid)

#check thread usage:

top -p $(cat /var/run/freeswitch/freeswitch.pid) -H -b -n 1

#memory mapping:

cat /proc/$(cat /var/run/freeswitch/freeswitch.pid)/maps

you can get some info from fs:

fs_cli -x "sofia global siptrace on"

fs_cli -x "fsctl debug_level 10"

fs_cli -x "sofia loglevel all 9"

fs_cli -x "fsctl debug_sql "

fs_cli -x "sofia global debug presence"

Put everything into a jira so we can take a look.

Regards,
António

On 03/10/2017 11:08 AM, Grant Bagdasarian wrote:
Hi,

We’re currently experiencing a weird issue with one of our freeswitch servers where the CPU just goes berserk and stays at 100%.
There are no active calls at that moment, but FS is still using 100% CPU.

I was unable to get a debug using gdb, since freeswitch does not crash.

We had this issue on 1.6.13 and then I upgraded to 1.6.15 this morning, but the problem still persists.
There is currently only one active application running on this box which is using LUA. Maybe that is causing the issue?
We checked the code but there are no weird loops etc. Perhaps we are missing something?

Any ideas how to trace this?

Regards,

Grant

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Saludos / Regards / Cumprimentos,

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