How do I automatically generate a vmcore to help analyse soft lockups?

Solution Verified - Updated -

Issue

  • My system is experiencing soft-lockups, e.g. BUG: soft lockup - CPU#3 stuck for 11s! [frob:2342]
  • Red Hat Support requests a vmcore from the system at the time of the soft-lockups to aid in the analysis of the underlying problem.
  • Monitoring and manual intervention to dump the vmcore during an occurrence by undertaking the methods described in the article What is the Sysrq facility and how do I use it? is not convenient.
  • I need to have a vmcore dump generated automatically when a soft-lockup occurs.

Environment

  • Red Hat Enterprise Linux 5.3 (or newer) - All architectures
  • Red Hat Enterprise Linux 6 - All architectures
  • Red Hat Enterprise Linux 7 - All architectures
  • Soft lockup messages in log files.

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