(dbx) where     
current thread: t@6
  [1] _libc_read(0xddb207a4, 0xdd7844b0, 0xdd78455a), at 0xdda9e1af
  [2] _filbuf(0xddb207a4), at 0xddacd4c1
  [3] fgets(0xdaa8ee1c, 0x3ff, 0xddb207a4), at 0xddacfc06
=>[4] os::message_box(title = 0xdd60f579 "assertion failure", message = 0xdaa8f270 "assert(_card_table->addr_is_marked_imprecise(obj), "Found unmarked young_gen object")\n\nDo you want to debug the problem?"), line 2536 in "os_solaris.cpp"
  [5] report_error(is_vm_internal_error = 1, file_name = 0xdd5aa27f "/net/ghopper/LocalBuild/main_baseline/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp", line_no = 59, title = 0xdd60f579 "assertion failure", format = 0xdd60f58b "assert(%s, "%s")", ...), line 346 in "debug.cpp"
  [6] report_assertion_failure(code_str = 0xdd5aa254 "_card_table->addr_is_marked_imprecise(obj)", file_name = 0xdd5aa27f "/net/ghopper/LocalBuild/main_baseline/src/share/vm/gc_implementation/parallelScavenge/cardTableExtension.cpp", line_no = 59, message = 0xdd5aa2ec "Found unmarked young_gen object"), line 144 in "debug.cpp"
  [7] CheckForUnmarkedObjects::do_object(this = 0xdaa8fc3c, obj = 0x9b1bf7b0), line 59 in "cardTableExtension.cpp"
  [8] MutableSpace::object_iterate(this = 0x82be760, cl = 0xdaa8fc3c), line 86 in "mutableSpace.cpp"
  [9] PSOldGen::object_iterate(this = 0x80f7698, cl = 0xdaa8fc3c), line 109 in "psOldGen.hpp"
  [10] CardTableExtension::verify_all_young_refs_imprecise(), line 318 in "cardTableExtension.cpp"
  [11] PSScavenge::invoke_no_policy(notify_ref_lock = 1), line 336 in "psScavenge.cpp"
  [12] PSMarkSweep::invoke(notify_ref_lock = 1, maximum_heap_compaction = 0), line 48 in "psMarkSweep.cpp"
  [13] VM_ParallelGCSystemGC::doit(this = 0x8046a08), line 156 in "vm_operations.cpp"
  [14] VM_Operation::evaluate(this = 0x8046a08), line 26 in "vm_operations.cpp"
  [15] VMThread::evaluate_operation(this = 0x833c738, op = 0x8046a08), line 276 in "vmThread.cpp"
  [16] VMThread::loop(this = 0x833c738), line 371 in "vmThread.cpp"
  [17] VMThread::run(this = 0x833c738), line 204 in "vmThread.cpp"
  [18] _start(data = 0x833c738), line 732 in "os_solaris.cpp"
  [19] _thr_setup(0xdda60a00), at 0xddb64a59
  [20] _lwp_start(), at 0xddb64ce0
(dbx) frame 7
Current function is CheckForUnmarkedObjects::do_object
   59         assert(_card_table->addr_is_marked_imprecise(obj), "Found unmarked young_gen object");
(dbx) print object_check
object_check = {
    _young_gen     = 0x80f63a8
    _card_table    = 0x80f6228
    _unmarked_addr = 0x9b1c0694
}
(dbx) print object_check._card_table->byte_for((const void*)0x9b1c0694)
object_check._card_table->byte_for((const void *) 0x9b1c0694U) = 0x93e08e03


 --------- cut from program output --------------

<m o:93e08e03 c:dd7a4da0> <--- we called mark on the card 0x93e08e03

[c 93e08e03 - 93e08e06] <--- we immediately clear the new mark.

	I do not yet know where the code is going awry, but it is
obvious we've got a bug, and it needs to be fixed.