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Function arguments can be accessed at kretprobe using $arg<N> fetcharg. This
is useful to record the function parameter and return value at once, and
-trace the difference of structure fields (for debuging a function whether it
+trace the difference of structure fields (for debugging a function whether it
correctly updates the given data structure or not).
See the :ref:`sample<fprobetrace_exit_args_sample>` in fprobe event for how
it works.