JDK-8304815 introduced using NMT for more precise hs_err file printing. It came with gtests that test correct live- and dead-block printing.

Live/dead-block printing: given a pointer into or very nearby live/dead malloced block, it tests that the printout identifies that block correctly.

Unfortunately, the dead-block-printing tests are prone to intermittent errors, typically on platforms I don't own and cannot test. These tests are not worth the maintenance burden and should just be removed.