6978187: G1: assert(ParallelGCThreads> 1 || n_yielded() == _hrrs->occupied()) strikes again Summary: An evacuation failure while copying the roots caused an object, A, to be forwarded to itself. During the subsequent RSet updating a reference to A was processed causing the reference to be added to the RSet of A's heap region. As a result of adding to the remembered set we ran into the issue described in 6930581 - the sparse table expanded and the RSet scanning code walked the cards in one instance of RHashTable (_cur) while the occupied() counts the cards in the expanded table (_next). Reviewed-by: tonyp, iveresov

os_family = linux

arch = x86

arch_model = x86_64

os_arch = linux_x86

os_arch_model = linux_x86_64

lib_arch = amd64

compiler = gcc

sysdefs = -DLINUX -D_GNU_SOURCE -DAMD64