Kdump kernel cannot boot up, hangs at "Switching to clocksource tsc"

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Issue

Kernel was upgraded from 2.6.32-131.0.15.el6 to 2.6.32-279.5.2.el6
After updating, when a panic is triggered, the kdump kernel hangs after following messages

Refined TSC clocksource calibration: 2133.408 MHz
Switching to clocksource tsc

Environment

Red Hat Enterprise Linux 6.3
kernel-2.6.32-279.5.2.el6
kexec-tools-2.0.0-188.el6.x86_64

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