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

Solution Verified - Updated -


  • /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?


  • 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)

Subscriber exclusive content

A Red Hat subscription provides unlimited access to our knowledgebase, tools, and much more.

Current Customers and Partners

Log in for full access

Log In