VM crashes due to failed assertion "assert(thread < _num_vtimes) failed: just checking" when G1ConcRefinementThreads > ParallelGCThreads:

jdk1.8.0/fastdebug/bin/java -XX:+UseG1GC -XX:G1ConcRefinementThreads=2 -XX:ParallelGCThreads=1 -version

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/g1RemSetSummary.cpp:70
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/HUDSON/workspace/8-2-build-linux-amd64/jdk8/254/hotspot/src/share/vm/gc_implementation/g1/g1RemSetSummary.cpp:70), pid=12479, tid=139827559917312
# assert(thread < _num_vtimes) failed: just checking
#
# JRE version: (8.0-b108) (build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.0-b50-fastdebug mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /tmp/8/hs_err_pid12479.log