Why Red Hat Enterprise Linux 5 is getting Soft lockup in evdev_open()?

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Issue

System experiences soft lockups in evdev_open() which requires a forced reboot to recover.
System experiences a memory leak when keyboard or mouse input devices are removed.

Environment

Red Hat Enterprise Linux 5.7 and 5.8
kernel-2.6.18-274.17.1.el5
kernel-2.6.18-308.1.1.el5

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