Kernel panic 'not syncing: hung_task: blocked tasks' on restart after crash.

Solution Unverified - Updated -

Issue

  • Server has crashed, produced a coredump,
  • Afterwards it doesn't boot as it gives a kernel panic (when starting PowerPath, apparently).
  • Unable to start the system in single user mode (even adding 'single' after grub boot line).

Environment

  • Red Hat Enterprise Linux 5.8

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