b0.Event("GoCreateSyscall", trace.GoID(4))
	b0.Event("GoSyscallEndBlocked")
	b0.Event("ProcStatus", trace.ProcID(0), go122.ProcIdle)
	b0.Event("ProcStart", trace.ProcID(0), testgen.Seq(1))
	b0.Event("GoStatus", trace.GoID(4), trace.NoThread, go122.GoRunnable)
	b0.Event("GoStart", trace.GoID(4), testgen.Seq(1))
	b0.Event("GoSyscallBegin", testgen.Seq(2), testgen.NoStack)
	b0.Event("GoDestroySyscall")

	case "stack":
		u = b.gen.Stack(arg.([]trace.StackFrame))
	case "seq":
		u = uint64(arg.(Seq))
	case "pstatus":
		u = uint64(arg.(go122.ProcStatus))
	case "gstatus":
		u = uint64(arg.(go122.GoStatus))
	case "g":
		u = uint64(arg.(trace.GoID))
	case "m":
		u = uint64(arg.(trace.ThreadID))
	case "p":
		u = uint64(arg.(trace.ProcID))
	case "string":
		u = b.gen.String(arg.(string))
	case "task":