Platform : Solaris-sparc 5.8
Java Version:
java version "1.5.0-beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-beta-b03)
Java HotSpot(TM) Client VM (build 20030404094358.robertg.baseline-fastdebug1-debug, mixed mode)
VM Args Used:
   -server -XX:CompileThreshold=100 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled

Step to reproduce
1. cd /net/sqesvr.eng/export/vsn/GammaBase/Bugs/{BugID}
2. sh rerun.sh

Log:
------------------------------------------------------
200 connections so far.
Creating room number 11 ...
# Java VM: Java HotSpot(TM) Server VM (20030404094358.robertg.baseline-fastdebug-debug mixed mode)
#
# assert(Universe::heap()->is_gc_active(), "should only be called during gc")
#
# Error ID: /net/balvenie.sfbay/export/imgr_home/ws/20030404094358.robertg.baseline/src/share/vm/code/nmethod.cpp, 523 [ Patched ]
#
# Problematic Thread: prio=9 tid=0x001333e0 nid=0xc runnable
#
VM option 'CompileThreshold=100'
VM option '+UseConcMarkSweepGC'
VM option '+CMSClassUnloadingEnabled'
VM option '+CMSPermGenSweepingEnabled'

Heap at VM Abort:
Heap
 par new generation total 4032K, used 464K [0xf0400000, 0xf0800000, 0xf0800000)
  eden space 3968K, 11% used [0xf0400000, 0xf04741b8, 0xf07e0000)
  from space 64K, 0% used [0xf07f0000, 0xf07f0000, 0xf0800000)
  to space 64K, 0% used [0xf07e0000, 0xf07e0000, 0xf07f0000)
 concurrent mark-sweep generation total 12288K, used 4340K [0xf0800000, 0xf1400000, 0xf4400000)
 concurrent-mark-sweep perm gen total 16384K, used 1577K [0xf4400000, 0xf5400000, 0xf8400000)
Dumping core....

Output from dbx:
--------------------------
(/java/devtools/sparc/SUNWspro/SC6.1/bin/../WS6U1/bin/sparcv9/dbx) where
current thread: t@12
=>[1] __sigprocmask(0x0, 0xf8680a38, 0x0, 0x0, 0x0, 0x0), at 0xff369764
  [2] _resetsig(0xff36bf60, 0x0, 0x0, 0xf8681d70, 0xff37e000, 0x0), at 0xff35e970
  [3] _sigon(0xf8681d70, 0xff385930, 0x6, 0xf8680b0c, 0xf8681d70, 0x6), at 0xff35e110
  [4] _thrp_kill(0x0, 0xc, 0x6, 0xff37e000, 0xc, 0xff2c0448), at 0xff361150
  [5] raise(0x6, 0x0, 0x0, 0xffffffff, 0xff2c03b4, 0x4), at 0xff24b9d4
  [6] abort(0xff2bc004, 0xf8680c60, 0x0, 0xfffffff8, 0x4, 0xf8680c81), at 0xff2358f4
  [7] os::abort(0x1, 0xfdce0de4, 0xf86814e0, 0x7efefeff, 0x81010100, 0xff00), at 0xfd85601c
  [8] report_error(0xfe449b90, 0xfe4901b0, 0x29000, 0x29244, 0x65, 0xa), at 0xfd3d14b4
  [9] report_assertion_failure(0xfe1579f5, 0xfe157a16, 0x20b, 0xfe157a7c, 0x6823, 0x0), at 0xfd3d08cc
  [10] nmethod::follow_roots_or_mark_for_unloading_for_CMS(0xf89a1308, 0xf86818ac, 0x1, 0xf86817f4, 0xf89a13f0, 0x1), at 0xfd81c534
  [11] CodeCache::do_unloading_for_CMS(0xfe4684bc, 0xf868188c, 0x1, 0xf86817f4, 0xfe428b3c, 0xfe4da324), at 0xfd351ee8
  [12] CMSCollector::refProcessingWork(0xfdcaeae1, 0x1, 0x0, 0x0, 0x0, 0xfd80625c), at 0xfd3a6b1c
  [13] CMSCollector::checkpointRootsFinalWork(0xfe451b18, 0xfdcacaec, 0x0, 0x0, 0x2a808, 0xfd945dc8), at 0xfd3a46d4
  [14] CMSCollector::doCMSOperation(0xfe45244c, 0x1, 0x29d58, 0x27400, 0x27540, 0x0), at 0xfd3a87a4
  [15] CMSCollector::stopWorldAndDo(0x12aa68, 0x1, 0xf4, 0xfdca44c7, 0x2940c, 0x28e90), at 0xfd3a8d7c
  [16] CMSCollector::collect_in_background(0xfe47fc08, 0xfe451dfc, 0xfe428a70, 0x1, 0xfe448098, 0x28e90), at 0xfd39c4e8
  [17] ConcurrentMarkSweepThread::run(0x28800, 0x28bbc, 0xfe448094, 0x29d88, 0x28400, 0x28484), at 0xfd3b1f00
  [18] _start(0x1333e0, 0xff37f688, 0x1, 0x1, 0xff37e000, 0x0), at 0xfd854448

--------------------------

###@###.### 2003-04-10: command-line used:

-server -XX:CompileThreshold=100 -XX:+UseConcMarkSweepGC -XX:+UseParNewGC -XX:+CMSClassUnloadingEnabled -XX:+CMSPermGenSweepingEnabled -DHANGING with COM.volano.Mark -count 100 -rooms {25,37,50}