Why server rebooted with "PANIC: Timer expired!" or "kernel: DEADMAN: System is set to reboot when the safety time expires" message?

Solution Verified - Updated -

Issue

  • Why server rebooted unexpectedly with kernel: DEADMAN: System is set to reboot when the safety time expires error message ?
  • Panic occurred with following messages.
Kernel panic - not syncing: PANIC: Timer expired! 

Environment

  • Red Hat Enterprise Linux
  • Service guard cluster is configured.

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