topic RE: mcmgr process has crashed in ExtremeSwitching (EXOS/Switch Engine)

mcmgr process has crashed

eyeV — Mon, 17 Aug 2015 10:18:00 GMT

Hi everybody.

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

What does this proceess responsible for?

RE: mcmgr process has crashed

Senguttuvan__Ar — Mon, 17 Aug 2015 10:42:00 GMT

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.

RE: mcmgr process has crashed

eyeV — Mon, 17 Aug 2015 10:42:00 GMT

Thanks!

RE: mcmgr process has crashed

Tripathy__Priya — Mon, 17 Aug 2015 10:58:00 GMT

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

RE: mcmgr process has crashed

eyeV — Tue, 18 Aug 2015 11:10:00 GMT

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).
And then...
CPU 1 Unable to handle kernel paging request at virtual address 00000000, epc == 80434b98, ra == 80434b40Could anyone advise what happened?

RE: mcmgr process has crashed

Rahmathullah__S — Tue, 18 Aug 2015 11:42:00 GMT

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

RE: mcmgr process has crashed

eyeV — Tue, 18 Aug 2015 11:42:00 GMT

Thanks. It seems very useful!

What XOS version is recommended for X670 and X480?

RE: mcmgr process has crashed

Rahmathullah__S — Tue, 18 Aug 2015 11:42:00 GMT

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

RE: mcmgr process has crashed

eyeV — Tue, 18 Aug 2015 11:42:00 GMT

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.

RE: mcmgr process has crashed

Ryan_Mathews — Tue, 18 Aug 2015 11:42:00 GMT

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.