Issue

• Can I detect a hung process?

• What are the following variables? What do these hung task configuration parameters and their values mean and control?

  # sysctl -a --pattern hung
  kernel.hung_task_warnings = 10
  kernel.hung_task_timeout_secs = 120
  kernel.hung_task_check_count = 32768
  kernel.hung_task_panic = 0
  

• How can I use hung task check?

  • How to automatically collect vmcore when "hung_task_timeout_secs" messages are logged?

    INFO: task <process>:<pid> blocked for more than 120 seconds.  
    "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.  
    

• How to set 'hung_task_panic' parameter ?

  • When or under what circumstances should I avoid setting 'hung_task_panic'?

• How can I reduce or disable the number of "task ... blocked for more than N seconds" events being logged?