  Exponential stability of the second order linear delay differential equation
in $x$ and $u$-control $$
\ddot{x}(t)+a_1(t)\dot{x}(h_1(t))+a_2(t)x(h_2(t))+a_3(t)u(h_3(t))=0 $$ is
studied, where indirect feedback control
$\dot{u}(t)+b_1(t)u(g_1(t))+b_2(t)x(g_2(t))=0$ connects $u$ with the solution.
Explicit sufficient conditions guarantee that both $x$ and $u$ decay
exponentially.
