The ftrace() tapset function of SystemTap doesn't work as expected

Solution In Progress - Updated -

Issue

The ftrace() tapset function of SystemTap doesn't emit any output into the ftrace ring buffer when used on RHEL 7 and/or RHEL 8.

The function works fine on RHEL 6.

Environment

  • Red Hat Enterprise Linux 7
  • Red Hat Enterprise Linux 8

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