{name: "schedtrace", value: &debug.schedtrace},
	{name: "traceadvanceperiod", value: &debug.traceadvanceperiod},
	{name: "traceallocfree", atomic: &debug.traceallocfree},
	{name: "tracecheckstackownership", value: &debug.traceCheckStackOwnership},
	{name: "tracebackancestors", value: &debug.tracebackancestors},
	{name: "tracefpunwindoff", value: &debug.tracefpunwindoff},
}

func parsedebugvars() {
	// defaults

	applies if a program is built with GOEXPERIMENT=exectracer2. Used primarily for testing
	and debugging the execution tracer.

	tracecheckstackownership: setting tracecheckstackownership=1 enables a debug check in the
	execution tracer to double-check stack ownership before taking a stack trace.

	asyncpreemptoff: asyncpreemptoff=1 disables signal-based

	// Figure out gp and mp for the backtrace.
	var mp *m
	if gp == nil {
		mp = getg().m
		gp = mp.curg
	}

	// Double-check that we own the stack we're about to trace.
	if debug.traceCheckStackOwnership != 0 && gp != nil {
		status := readgstatus(gp)
		// If the scan bit is set, assume we're the ones that acquired it.
		if status&_Gscan == 0 {
			// Use the trace status to check this. There are a number of cases

		}
		cmd.Args = append(cmd.Args, testPath)
		cmd.Env = append(os.Environ(), "GOEXPERIMENT=rangefunc")
		// Add a stack ownership check. This is cheap enough for testing.
		godebug := "tracecheckstackownership=1"
		if stress {
			// Advance a generation constantly to stress the tracer.
			godebug += ",traceadvanceperiod=0"
		}
		if extraGODEBUG != "" {
			// Add extra GODEBUG flags.