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

Solution Verified - Updated 2018-03-19T17:16:17+00:00 -

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
Processes in uninterruptible sleep (D state)

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