SingleStep JVMTI event fails assertion with fastdebug jdk version:

#
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (/BUILD_AREA/jdk6.0/hotspot/src/share/vm/prims/jvmtiEventController.cpp, 590), pid=3265, tid=1075637168
#
# Java VM: Java HotSpot(TM) Client VM (1.6.0-rc-fastdebug-b61-debug mixed mode)
#
# Error: assert(false,"should never come here before live phase")
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#


To reproduce:
1. Add /net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/src/nsk/share/lib/$ARCH$
   in LD_LIBRARY_PATH

   ex: export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/net/vmsqe.sfbay/export/backup/testbase/testbase_vm.1.6_r02/vm/src/nsk/share/lib/sparc

2. run
/net/koori.sfbay/onestop/jdk/1.6.0/latest/binaries/solaris-sparc/fastdebug/bin/java
-agentlib:JVMTIagent=stress3 -version