System becomes unresponsive with message "INFO: task <process>:<pid> blocked for more than 120 seconds".

Solution Verified - Updated -

Issue

  • /var/log/messages had a series of following messages before the system became unresponsive:
INFO: task <process>:<pid> blocked for more than 120 seconds
  • What is the reason behind above messages and what kind of information is needed to troubleshoot them?

Environment

  • Red Hat Enterprise Linux (RHEL) 5.5 (kernel-2.6.18-194) or above
  • Red Hat Enterprise Linux (RHEL) 6
  • Red Hat Enterprise Linux (RHEL) 7
  • Red Hat Enterprise Linux (RHEL) 8
  • Processes in uninterruptible sleep (D state)

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