64bit JVM crashes with Internal Error (type.cpp:763) - ShouldNotReachHere() with enabled COOPs

That issue is seen with 64 bit Server JVM, Linux RedHat 5, Windows 2003, Windows Vista.
The JDK used is 7 b29 from /net/bonsai.sfbay/w/builds/jdk/7/pit/b29/bundles that comes with hs_13, b01.
Typical failure output is:

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (type.cpp:763), pid=15656, tid=1089530176
# Error: ShouldNotReachHere()
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (13.0-b01 mixed mode linux-amd64 compressed oops)
# An error report file with more information is saved as:
# /export/local/5897.JDK7.PIT.JMX+64BITRHAS5.0AMD_server_mixed_testlist.functional/results/gtee.Linux.amd64/mbeanperf_03/hs_err_pid15656.log
#
# If you would like to submit a bug report, please visit:
# http://java.sun.com/webapps/bugreport/crash.jsp
#