During CTW testing on amd64 (-d64) I got the next assert which is reproduced
with current c2_baseline:

foundation% /tmp/kvn/jdk1.6.0/fastdebug/bin/java -d64 -Xss4m -verify -XX:+CompileTheWorld -XX:CompileTheWorldStartAt=8193 -Xbootclasspath/p:/net/vmsqe.sfbay/export/backup/testbase/CompileTheWorld/jarfiles/weblogicbig.jar
...
CompileTheWorld (10929) : weblogic/management/internal/RemoteRealmManagerImpl
CompileTheWorld (10930) : weblogic/management/internal/RemoteRealmManagerImpl_WLSkel
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/assembler.cpp:108]
#
# An unexpected error has been detected by Java Runtime Environment:
#
# Internal Error (/net/prt-solamd64-q1-2/PrtBuildDir/workspace/src/share/vm/asm/assembler.cpp, 108), pid=24021, tid=11
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20060710121006.kvn.main_to_c2_baseline-debug mixed mode)
#
# Error: assert(_code_section == code()->consts(),"not in consts?")
# An error report file with more information is saved as hs_err_pid24021.log
#

It passed with -XX:ReservedCodeCacheSize=50m (default 48m).