[ofa-general] Intermittent: ib0: multicast join failed

[Sasha Khapyorsky]

On 16:45 Thu 18 Sep     , Roger Spellman wrote:
> I have many nodes, each with a Mellanox MT25204.  When I reboot some
> nodes, they occasionally get the following error:
> 
> ib0: multicast join failed

What is the software stack? Which version?

> Rebooting the system almost always solves this problem.
> 
> What causes this?

What are SM you using? If it is OpenSM you can see in the log
(/vat/log/opensm.log) why the join failed.

> Is there a way to solve this without rebooting?

Hard to say - the reason for failure is unknown. I could be port's low
speed/width or something else, hard to say without any details.

Sasha