What causes of 'sending NMI to all CPUs'?

Solution Verified - Updated -

Issue

  • System is showing lots of NMI backtrace for cpu X with call traces
  • also INFO: rcu_sched detected stalls on CPUs/tasks:
  • Before this, it shows 'sending NMI to all CPUs'
  • What's the reason of this NMI messages which is not triggered by hardware

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 6

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