While trying to install Oracle Database 11gR2 on a Red Hat Enterprise Linux Server release 6.0 (Santiago), guest host on vmware ESX5i.
You might encounter the following error:

To fixed this error, execute this command on shell before launching the oracle runInstaller

Then the installer will run normally.

Oracle Database 11gR2 - runInstaller

Oracle Database 11gR2 runInstaller – An unexpected error [ld-linux-x86-64.so.2+0x14d70]