Puppet users - Jun 2014 - Problem after updating to puppet-3.6.2-1

Hi

I am having an issues after updating to puppet-3.6.2-1. Main problem is
that few nodes are failing with  "Error: Could not retrieve catalog;
skipping run " all the time.  I am running puppet with passenger and it was
working perfectly before upgrade. I am managing almost 200 nodes with
puppet.
Added debug to /usr/share/puppet/rack/puppetmasterd/config.ru and I can see
a lot of logs at master but there is no error in it.
puppet server is running on a vm with 8GB RAM and 4 core.

It seems that the main culprit is a module which creates user account on
the machine. I want to create  around 4000 pool accounts and it worked
really well before update. But now I can not create all these accounts
together although it work in small chunks.

I have looked into passenger-status and there are enough memory left so it
doesn't look like memory issue.

I don't understand that what has change with new update. I will appreciate
any pointer or suggestion .

Thanks
Kashif

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