KVM guest hangs at boottime - last message is from serial port driver

Solution Unverified - Updated -

Issue

A Red Hat Enterprise Linux 6.2 KVM guest hangs at boottime after the serial port driver has logged the following console message:

Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled

This issue can only occur with KVM guests that have more than one virtual CPU and that are using the clocksource kvm-clock.

Environment

  • Red Hat Enterprise Linux 6.3 KVM host
  • Red Hat Enterprise Linux 6.2 KVM guest

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