While testing bug 4802822, I get the following assert:

Forcing desperate garbage collection...
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/markSweep.inline.hpp:15
#
# HotSpot Virtual Machine Error, assertion failure
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) Server VM (1.4.1-internal-debug compiled mode)
#
# assert(new_pointer != 0 || obj->mark() == markOopDesc::prototype(), "should contain a forwarding pointer")
#
# Error happened during: full generation collection
#
# Error ID: /net/slo/export/azeem/4797656/src/share/vm/gc_implementation/shared/markSweep.inline.hpp, 15 [ Patched ]
#
# Thread requesting VM operation: prio=5 tid=0x006919c8 nid=0x13 waiting on condition
#

Heap at VM Abort:
Heap
 par new generation total 4032K, used 12K [0xf0800000, 0xf0c00000, 0xf1d50000)
  eden space 3968K, 0% used [0xf0800000, 0xf0800000, 0xf0be0000)
  from space 64K, 19% used [0xf0bf0000, 0xf0bf3218, 0xf0c00000)
  to space 64K, 0% used [0xf0be0000, 0xf0be0000, 0xf0bf0000)
 concurrent mark-sweep generation# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/binaryTreeDictionary.cpp:702
[error occured during error reporting]
 total 8040K, used 5080K [0xf1d50000, 0xf252a000, 0xf4800000)
 concurrent-mark-sweep perm gen
Unexpected Signal : 10 occurred at PC=0xFDF670F0
Function=[Unknown. Nearest: SUNWprivate_1.1+0x3670F0]
Library=/export/azeem/jdk1.4/jre/lib/sparc/server/libjvm.so


Its an intermittent problem that is hindering bug 4802822

==========================

New assert with the same test case, BUT I've removed the -Xconcgc and -XX:+UseNewParGC flags

# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc: SuppressErrorAt=/markSweep.inline.hpp:19
#
# HotSpot Virtual Machine Error, assertion failure
# Please report this error at
# http://java.sun.com/cgi-bin/bugreport.cgi
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (1.4.1-internal-debug compiled mode)
#
# assert(Universe::heap()->is_in_reserved(new_pointer), "should be in object space")
#
# Error happened during: full generation collection
#
# Error ID: /export/azeem/c2/src/share/vm/gc_implementation/shared/markSweep.inline.hpp, 19 [ Patched ]
#
# Thread requesting VM operation: prio=5 tid=0x000000010028b3e8 nid=0xe waiting on condition
#

Heap at VM Abort:
Heap
 def new generation total 3200K, used 529K [0xffffffff2ec00000, 0xffffffff2ef30000, 0xffffffff30150000)
  eden space 3136K, 16% used [0xffffffff2ec00000, 0xffffffff2ec844c8, 0xffffffff2ef10000)
  from space 64K, 0% used [0xffffffff2ef10000, 0xffffffff2ef10000, 0xffffffff2ef20000)
  to space 64K, 0% used [0xffffffff2ef20000, 0xffffffff2ef20000, 0xffffffff2ef30000)
 tenured generation total 6408K, used 3840K [0xffffffff30150000, 0xffffffff30792000, 0xffffffff32c00000)
   the space 6408K, 59% used [0xffffffff30150000, 0xffffffff305103b8, 0xffffffff30590a00, 0xffffffff30792000)
 compacting perm gen total 10240K, used 2524K [0xffffffff32c00000, 0xffffffff33600000, 0xffffffff36c00000)
   the space 10240K, 24% used [0xffffffff32c00000, 0xffffffff32e77238, 0xffffffff32e77400, 0xffffffff33600000)
Dumping core....

###@###.### 2003-01-16