Mailing List Archive

On Sat, Jul 8, 2023 at 2:59?AM Karl Buckland <buckland.karl@gmail.com>
wrote:

> I'm running v33.1+fixes.202307022004.83e1df82c2~ubuntu20.04.1. This
> problem has been happening for a little while now and I've recently
> updated packages to see if that would help, but to no avail.
>
> I'm running Ubuntu 20.04 in a container under proxmox. If I reboot the
> container, mythbackend starts again normally with normal CPU usage.
> The problem seems to return after many hours. Once the high CPU starts
> it seems to stay until I restart mythbackend.
>
> I've tried looking through the mythbackend log but there doesn't seem
> to be any obvious cause of the problem while it's happening.
>
> What can I do to get more information on this?
>
> mythbackend --setloglevel debug



Regards,
>
> Karl
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>

Every now and then there are similar threads about high CPU usage when
mythbackend is in idle mode.

In most cases, there has been multiple paths enabled to collect the EPG
data,
either multiple tuners has been configured for collecting EIT (active EIT
scan)
or XMLTV and active EIT scan have been configured to collect data for the
same source.

Another possibility is that the system runs out of disk space or swap space.

IIRC there was one security incident not caused by MythTV but maybe
triggered by mythbackend that caused
high CPU load on a single kworker thread.

Roland


On Sat, Jul 8, 2023 at 9:14?PM Larry Kennedy <lunchtimelarry@gmail.com>
wrote:

>
>
> On Sat, Jul 8, 2023 at 2:59?AM Karl Buckland <buckland.karl@gmail.com>
> wrote:
>
>> I'm running v33.1+fixes.202307022004.83e1df82c2~ubuntu20.04.1. This
>> problem has been happening for a little while now and I've recently
>> updated packages to see if that would help, but to no avail.
>>
>> I'm running Ubuntu 20.04 in a container under proxmox. If I reboot the
>> container, mythbackend starts again normally with normal CPU usage.
>> The problem seems to return after many hours. Once the high CPU starts
>> it seems to stay until I restart mythbackend.
>>
>> I've tried looking through the mythbackend log but there doesn't seem
>> to be any obvious cause of the problem while it's happening.
>>
>> What can I do to get more information on this?
>>
>> mythbackend --setloglevel debug
>
>
>
> Regards,
>>
>> Karl
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users@mythtv.org
>> http://lists.mythtv.org/mailman/listinfo/mythtv-users
>> http://wiki.mythtv.org/Mailing_List_etiquette
>> MythTV Forums: https://forum.mythtv.org
>>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org
>

On Mon, Jul 10, 2023 at 6:24?AM Roland Ernst <rcrernst@gmail.com> wrote:

> Every now and then there are similar threads about high CPU usage when
> mythbackend is in idle mode.
>
> In most cases, there has been multiple paths enabled to collect the EPG
> data,
> either multiple tuners has been configured for collecting EIT (active EIT
> scan)
> or XMLTV and active EIT scan have been configured to collect data for the
> same source.
>
> Another possibility is that the system runs out of disk space or swap
> space.
>
> IIRC there was one security incident not caused by MythTV but maybe
> triggered by mythbackend that caused
> high CPU load on a single kworker thread.
>
> Roland
>
>
> On Sat, Jul 8, 2023 at 9:14?PM Larry Kennedy <lunchtimelarry@gmail.com>
> wrote:
>
>>
>>
>> On Sat, Jul 8, 2023 at 2:59?AM Karl Buckland <buckland.karl@gmail.com>
>> wrote:
>>
>>> I'm running v33.1+fixes.202307022004.83e1df82c2~ubuntu20.04.1. This
>>> problem has been happening for a little while now and I've recently
>>> updated packages to see if that would help, but to no avail.
>>>
>>> I'm running Ubuntu 20.04 in a container under proxmox. If I reboot the
>>> container, mythbackend starts again normally with normal CPU usage.
>>> The problem seems to return after many hours. Once the high CPU starts
>>> it seems to stay until I restart mythbackend.
>>>
>>> I've tried looking through the mythbackend log but there doesn't seem
>>> to be any obvious cause of the problem while it's happening.
>>>
>>> What can I do to get more information on this?
>>>
>>> mythbackend --setloglevel debug
>>
>>
I have in the past had a lot of mythcommflag processes hogging CPU that
never ended until I killed them manually.

On Sat, 8 Jul 2023 at 20:12, Larry Kennedy <lunchtimelarry@gmail.com> wrote:
>
>
>
> On Sat, Jul 8, 2023 at 2:59?AM Karl Buckland <buckland.karl@gmail.com> wrote:
>>
>> I'm running v33.1+fixes.202307022004.83e1df82c2~ubuntu20.04.1. This
>> problem has been happening for a little while now and I've recently
>> updated packages to see if that would help, but to no avail.
>>
>> I'm running Ubuntu 20.04 in a container under proxmox. If I reboot the
>> container, mythbackend starts again normally with normal CPU usage.
>> The problem seems to return after many hours. Once the high CPU starts
>> it seems to stay until I restart mythbackend.
>>
>> I've tried looking through the mythbackend log but there doesn't seem
>> to be any obvious cause of the problem while it's happening.
>>
>> What can I do to get more information on this?
>>
> mythbackend --setloglevel debug
>
>
>
>> Regards,
>>
>> Karl
>> _______________________________________________
>> mythtv-users mailing list
>> mythtv-users@mythtv.org
>> http://lists.mythtv.org/mailman/listinfo/mythtv-users
>> http://wiki.mythtv.org/Mailing_List_etiquette
>> MythTV Forums: https://forum.mythtv.org

The issue has occurred again. I was logging the result of the 'uptime'
command every 30 seconds so it's fairly clear when the problem
started.
https://logpaste.com/8pmt9UqV
Something happens around or shortly after 11:27 and the load climbs up.

I have extracted the relevant few minutes either side of the times
when the issue started, but I do not see anything obvious in the log?
Compared to long before and after, the messages look to be the same,
with the same frequency, etc.
https://logpaste.com/UtyM77hv

Does anyone have any thoughts?

Right now, top shows mythbackend at 100% so the issue is ongoing. Can
I find anything out while the problem is happening? Again, current
mythbackend logs look normal to me.

Karl
_______________________________________________
mythtv-users mailing list
mythtv-users@mythtv.org
http://lists.mythtv.org/mailman/listinfo/mythtv-users
http://wiki.mythtv.org/Mailing_List_etiquette
MythTV Forums: https://forum.mythtv.org

On Mon, 10 Jul 2023 at 23:46, Greg Oliver <oliver.greg@gmail.com> wrote:
>
> On Mon, Jul 10, 2023 at 6:24?AM Roland Ernst <rcrernst@gmail.com> wrote:
>>
>> Every now and then there are similar threads about high CPU usage when mythbackend is in idle mode.
>>
>> In most cases, there has been multiple paths enabled to collect the EPG data,
>> either multiple tuners has been configured for collecting EIT (active EIT scan)
>> or XMLTV and active EIT scan have been configured to collect data for the same source.
>>
>> Another possibility is that the system runs out of disk space or swap space.
>>
>> IIRC there was one security incident not caused by MythTV but maybe triggered by mythbackend that caused
>> high CPU load on a single kworker thread.
>>
>> Roland
>>
>>
>> On Sat, Jul 8, 2023 at 9:14?PM Larry Kennedy <lunchtimelarry@gmail.com> wrote:
>>>
>>>
>>>
>>> On Sat, Jul 8, 2023 at 2:59?AM Karl Buckland <buckland.karl@gmail.com> wrote:
>>>>
>>>> I'm running v33.1+fixes.202307022004.83e1df82c2~ubuntu20.04.1. This
>>>> problem has been happening for a little while now and I've recently
>>>> updated packages to see if that would help, but to no avail.
>>>>
>>>> I'm running Ubuntu 20.04 in a container under proxmox. If I reboot the
>>>> container, mythbackend starts again normally with normal CPU usage.
>>>> The problem seems to return after many hours. Once the high CPU starts
>>>> it seems to stay until I restart mythbackend.
>>>>
>>>> I've tried looking through the mythbackend log but there doesn't seem
>>>> to be any obvious cause of the problem while it's happening.
>>>>
>>>> What can I do to get more information on this?
>>>>
>>> mythbackend --setloglevel debug
>
>
> I have in the past had a lot of mythcommflag processes hogging CPU that never ended until I killed them manually.
>
> _______________________________________________
> mythtv-users mailing list
> mythtv-users@mythtv.org
> http://lists.mythtv.org/mailman/listinfo/mythtv-users
> http://wiki.mythtv.org/Mailing_List_etiquette
> MythTV Forums: https://forum.mythtv.org

Does mythcommflag run as a separate process? I am seeing mythbackend
using the cpu

Karl
_______________________________________________
mythtv-users mailing list
mythtv-users@mythtv.org
http://lists.mythtv.org/mailman/listinfo/mythtv-users
http://wiki.mythtv.org/Mailing_List_etiquette
MythTV Forums: https://forum.mythtv.org