[Pacemaker] Process cib loops infinitely with 100% cpu usage and can't be killed

[Andrew Beekhof]

On 10 Jun 2014, at 9:56 am, Gabriel Gomiz <ggomiz at cooperativaobrera.coop> wrote:

> On 05/30/2014 12:12 AM, Andrew Beekhof wrote:
>> There have been some big steps forward in cib for the next upstream release (its basically 2 orders of magnitude faster/more efficient).
>> Current versions will regularly max out a core, albeit for hopefully short periods of time depending on the cluster size:
>> 
>> 	https://twitter.com/beekhof/status/412913549837475840
>> 
>> Its also a vicious circle - a busy cib leads to failed resource actions, which leads to recovery operations, which leads to more work for the cib.
>> 
>> Looking at the size of your cluster, 87 resources on 4 nodes... I can imagine that benefitting greatly from the coming version.
>> 
>> I notice you're using a rhel package, are you a RH customer or is this on a clone?
> Clone. CentOS.

Ah ok.  In that case your best bet is to keep using upstream until 1.1.12 filters down to RHEL and then CentOS

>> Also, did anything specific happen prior to the CIB going nuts?
>>> Only thing that I can think of is a lot of calls to crm_mon via a shell script that we use to check
>>> which resource groups each node is servicing (attached if you're curious).
>>> We use this script to apply puppet manifests conditionally to our nodes and do some monitoring. Also
>>> we have cron jobs checking via the script if the resource group is active before running.
>>> Maybe the sum of that calls can make cib process very busy...?
>> If you were running it every second... maybe. But something is _seriously_ wrong if -KILL isn't working!
>> I wonder how much memory it was using at the time... perhaps the kernel was trying to write a huge core file?
> I don't think so. It was several days in that state.
> 
> Is there any way to check if a node has a resource group via a single simple call to crm resource?
> Because I didn't found a way we had to make a script that parse the entire crm_mon output.
>> 
>>> Anyway, I've built 1.1.12 rc1 RPMS and this morning I've upgraded the cluster. Will let you know if
>>> there is something weird after this upgrade.
>> Ok, I'd be interested to hear your feedback.
> 
> 1.1.12 rc1 working flawlessly until now. So it looks like it's fixed in that version.
> 
> Thanks!

Glad to hear we could give you a solution :)

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