Puppet agent freeze on Ubuntu

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http://serverfault.com – I have 40 Ubuntu 12.04 servers. These servers are managed with puppet. Sometimes I have problem with puppet agent. puppet agent spawn child process (sh) and this process fails. Sh is zombie process. Puppet doesn't work, I must restart puppet agent to make it works. I use puppet to manage files, packages and services. Problematic agent didn't make any change before fails, server is up to date. (HowTos)