SB-IMPL::RELEASE-FD-STREAM-RESOURCES eats up deadline restarts
Lorenz Mösenlechner via lists.sourcefor
SIGNAL-DEADLINE if a deadline is signaled inside the HANDLER-CASE form
conditions are caught and re-signaled outside the WITH-INTERRUPTS form
which causes SIGNAL-DEADLINE including its restarts to be unwound.
That means it becomes impossible to defer or cancel the deadline and
DEADLINE-TIMEOUT conditions occur.