OOM KILLER triggered when running apparently innocent shell script - Red Hat Customer Portal

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Issue

The first user logging into the system runs a bash script that sets some variables and cd's you into a directory and puts you out to a command prompt.
From there, running something as simple as the "date" command the session locks up. Shortly after, it disconnects the user and on the console of the system you start seeing "OOM KILLER" messages.
Sometimes the system comes back to a login prompt on the console; other times the entire system stops responding and must be rebooted.

Environment

Red Hat Enterprise Linux 6

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