Developers

@george1421 As well there should be CONFIG_CRYPTO_XTS (see https://cateee.net/lkddb/web-lkddb/CRYPTO_XTS.html) - but you need to enable CONFIG_EXPERIMENTAL for that option to show up.

@humoss233 As well run cryptsetup --help and check the last couple of lines for cipher information (from https://superuser.com/questions/1039487/check-that-kernel-supports-aes-xts-plain64-cipher).

@george1421 said in rcu_sched stall OR kernel panic on PowerEdge R640:

And on the other side we really don’t know what the impact could be.

Yes, because of that I don’t like switching it on.

What can it hurt?

I don’t know. Stalls on older CPUs?

@george1421 Looking through a stack of other rcu_sched stall topics in the forums I can’t seem to find any thread where I’d think that people had CPUs with more than 8 cores. Sure sooner or later this will be state of the art but I don’t reckon we should step ahead of this. We know the current kernel works pretty good on most CPUs and I’d rather point people to this topic and provide compile instructions than setting CONFIG_MAXSMP as default. Hmm?

@Greg-Plamondon How did you setup the cronjob? Or to be more specific - which user runs the cronjob? See here: https://serverfault.com/questions/352835/crontab-running-as-a-specific-user

@benjamind Do you still get the very same error message (Error returned: <empty>)??

@Quazz @george1421 Ok, back from travels… what shall we do with this pending topic. I do understand that adding CONFIG_MAXSMP does fix the rcu_sched stall issue on PowerEdge R640. But do we know if this fixes rcu_sched stalls on other platforms as well? Would we get at least two more people to test this before we add it to the official kernel?

@george1421 Did you get to test this kernel on your fleet of Dell hardware to see if it might cause any other harm?

@martial There is a good description on how to find which hosts are causing this: https://forums.fogproject.org/topic/8448/response-error-multiple-hosts-returned-for-list-of-mac-addresses

@mjaskowski From the things you wrote weeks ago I though you where way beyond that point already. The development tools are needed to compile the kernel from source code. You install those on a machine you want to use for playing with the kernel build. You can use your FOG server for this but any other Linux machine will do just as well. Doesn’t really matter.

@vangrimoire Which version of FOG do you run?