Try this:

$ CONF=linux-x86-server-fastdebug make images run-test TEST=runtime/Metaspace/elastic/

# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/home/shade/trunks/jdk/src/hotspot/share/memory/metaspace/testHelpers.cpp:69), pid=2383937, tid=2383977
# assert(is_aligned(reserve_limit, Metaspace::reserve_alignment_words())) failed: reserve_limit (524288) not aligned to metaspace reserve alignment (1048576)
#