After upgrading from RHEL5.3 to RHEL5.4, systems are crashing during boot

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Issue

Two HP DL360 G5 servers running RHEL 5.3 that were upgraded to 5.4 last night. After installing the packages and rebooting each server, both crashed during boot right after starting ntpd. System boots up fine with the previous kernel.

Environment

Red Hat Enterprise Linux 5.4

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