FYI, to debug the test script use:
impish/tools/testing/selftests/ftrace$ sudo ./ftracetest test.d/ftrace/func_stack_tracer.tc -v -d
FYI, to debug the test script use:
impish/ tools/testing/ selftests/ ftrace$ sudo ./ftracetest test.d/ ftrace/ func_stack_ tracer. tc -v -d