mcmgr process has crashed


Userlevel 3
Hi everybody.

I have a strange message in log.
Process mcmgr pid 1487 died with signal 11[/code]Then switch immediately reboted.

What does this proceess responsible for?

9 replies

Userlevel 3
Hi,

Process mcmgr is the multicast manager which takes care of storing the multicast entries. Looks like this process got crashed which led to switch reboot.

I would recommend you to open a case with GTAC to further investigate the crash.

While opening a case, I would recommend you to include following details to the case:

1. Was there any configuration change made to the network or switch prior to the crash?
2. Provide the complete show tech all output
3. We would also need the core dump which is available in ls internal-memory which can be taken out using the "upload debug " command.
Userlevel 3
Senguttuvan, Arun wrote:

Hi,

Process mcmgr is the multicast manager which takes care of storing the multicast entries. Looks like this process got crashed which led to switch reboot.

I would recommend you to open a case with GTAC to further investigate the crash.

While opening a case, I would recommend you to include following details to the case:

1. Was there any configuration change made to the network or switch prior to the crash?
2. Provide the complete show tech all output
3. We would also need the core dump which is available in ls internal-memory which can be taken out using the "upload debug " command.

Thanks!
Userlevel 4
Hello,

Adding to the comments by Arun would like to post few things for the possible reason of Mcmgr being triggered as below:

1: while trying to save/retrieve the mcmgr configuration, this might have been seen. If so then the root cause would be mcmgr process is trying to get VLAN information and it did not get a response,which resulted in the crash.

2: Mcmgr process crashes sometimes after removing a slot from an existing stack and unconfiguring that slot using "unconf slot command

Thanks
Ranjan
Userlevel 3
Hello again!
I'm unlucky fellow. My second core MLAG switch has rebooted recently.

I have some messages like below in log
pibL3MTUExceededInstallFilterLag(): Could not add action to send to CPU on 1:48, unit 1 (Table full).[/code]
And then...
CPU 1 Unable to handle kernel paging request at virtual address 00000000, epc == 80434b98, ra == 80434b40[/code]Could anyone advise what happened?
Userlevel 2
Hi,
From the logs "Kernel paging" it appears that Kernel crash occurred and this mostly occurs because of memory corruption in kernel.

Can you please refer below link and try to correlate with your case if matches:

https://gtacknowledge.extremenetworks.com/articles/Solution/xos0060100-Kernel-oops-occurs-due-to-mem...

I would recommend you to open a GTAC case for further investigation and if required.
explanation

Many thanks,
Syed
Userlevel 3
Rahmathullah, Syed Nishath wrote:

Hi,
From the logs "Kernel paging" it appears that Kernel crash occurred and this mostly occurs because of memory corruption in kernel.

Can you please refer below link and try to correlate with your case if matches:

https://gtacknowledge.extremenetworks.com/articles/Solution/xos0060100-Kernel-oops-occurs-due-to-mem...

I would recommend you to open a GTAC case for further investigation and if required.
explanation

Many thanks,
Syed

Thanks. It seems very useful!

What XOS version is recommended for X670 and X480?
Userlevel 2
Rahmathullah, Syed Nishath wrote:

Hi,
From the logs "Kernel paging" it appears that Kernel crash occurred and this mostly occurs because of memory corruption in kernel.

Can you please refer below link and try to correlate with your case if matches:

https://gtacknowledge.extremenetworks.com/articles/Solution/xos0060100-Kernel-oops-occurs-due-to-mem...

I would recommend you to open a GTAC case for further investigation and if required.
explanation

Many thanks,
Syed


Hi,
For both Summit X480 & X670, EXOS 15.5.4.2 is recommended by engineering.


You can refer below link in future as well: https://gtacknowledge.extremenetworks.com/articles/Q_A/What-Is-The-Recommended-Release-of-EXOS-For-M...

Syed
Userlevel 3
Rahmathullah, Syed Nishath wrote:

Hi,
From the logs "Kernel paging" it appears that Kernel crash occurred and this mostly occurs because of memory corruption in kernel.

Can you please refer below link and try to correlate with your case if matches:

https://gtacknowledge.extremenetworks.com/articles/Solution/xos0060100-Kernel-oops-occurs-due-to-mem...

I would recommend you to open a GTAC case for further investigation and if required.
explanation

Many thanks,
Syed

I'm sorry. https://clck.yandex.ru/click/dtype=stred/pid=20/cid=71883/path=page-translation.fulltext/*https://slovari.yandex.ru/%D0%AF%20%D0%BD%D0%B5%20%D0%BC%D0%BE%D0%B3%D1%83%20%D0%BF%D1%80%D0%B8%D0%B2%D1%8B%D0%BA%D0%BD%D1%83%D1%82%D1%8C%20%D0%BA%20%D1%8D%D1%82%D0%BE%D0%BC%D1%83./%D0%BF%D0%B5%D1%80%D0%B5%D0%B2%D0%BE%D0%B4/ I can't get used to use GTAC Knowledge Base.
Userlevel 6
Rahmathullah, Syed Nishath wrote:

Hi,
From the logs "Kernel paging" it appears that Kernel crash occurred and this mostly occurs because of memory corruption in kernel.

Can you please refer below link and try to correlate with your case if matches:

https://gtacknowledge.extremenetworks.com/articles/Solution/xos0060100-Kernel-oops-occurs-due-to-mem...

I would recommend you to open a GTAC case for further investigation and if required.
explanation

Many thanks,
Syed

Is there anything you'd like us to work on, with respect to GTAC Knowledge? Its a new site, so maybe you just mean you're still getting used to it as a resource. Either way, let us know if there is an improvement you'd like us to work on.

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