http://sagetrac.org/sage_trac/ticket/6453
The T2+ is used in the Sun T5240 at t2.math.washington.edu.
Sun have sent me a 'T' patch, which I have installed on t2.math.washington.edu.
This fixes the bug. This patch will soon be available on Sunsolve soon as
142542-01, though currently it is not generally available.
Oops, sun4m are quite old. It is sun4v which is effected by this bug.