CMS: vtest died with tiger b26

On j2se-bigapps.west, (SunOS j2se-bigapps 5.9 Generic_112233-09 sun4u sparc SUNW,Sun-Fire 20 cpu * 1050 MHZ, 98 GB memory )
vtest died with CMS gc on j2se-bigapps.west after 4 days.
Flags used: -client -Xcomp -XX:+UseConcMarkSweepGC
log files are under /bt/VolanoTestrun.25402.-client ( I may move the log
to /export/archive/tiger_b26/ later)

  ---- called from signal handler with signal 11 (SIGSEGV) ------
  [10] MarkSweep::IsAliveClosure::do_object_b(0xff12fbbc, 0x0, 0x6000, 0xff02c1ec,
0x35e900, 0x6314), at 0xfedbdfd8
  [11] ReferenceProcessor::process_discovered_reflist(0x28e760, 0xfedbdfd8, 0x0,
0x0, 0xff12fbbc, 0xff13226c), at 0xff02c1fc
  [12] ReferenceProcessor::process_discovered_references(0x28e760, 0xf8, 0x7640,
0xff1289a0, 0x0, 0x7400), at 0xff02bbcc
  [13] GenMarkSweep::invoke_at_safepoint(0x1, 0x7000, 0x7168, 0x28e760, 0x6c00,
0xc1e38), at 0xfedbb50c
  [14] CMSCollector::do_compaction_work(0x1d0190, 0x0, 0xeb800000, 0x0, 0x1d032c,
0x3600000), at 0xfee53900
  [15] CMSCollector::acquire_control_and_collect(0x1d0190, 0x2ac90, 0x0, 0x9,
0xff130510, 0x1d0268), at 0xfee53690
  [16] ConcurrentMarkSweepGeneration::collect(0x145d28, 0x0, 0x0, 0x2c2c54,
0xfee54f64, 0x1d0190), at 0xfee53400
  [17] GenCollectedHeap::do_collection(0x28ea98, 0x0, 0xc1e80, 0x10, 0xc1e84, 0x0),
at 0xfee7dd00
  [18] TwoGenerationCollectorPolicy::satisfy_failed_allocation(0xc1ca0, 0x10, 0x0,
0x0, 0xdcf7f3b4, 0xff116000), at 0xfee42f58
  [19] VM_GenCollectForAllocation::doit(0xdcf7f398, 0x62, 0xfed745d8, 0xff1338dc,
0x6c00, 0xff13aa74), at 0xfedb025c
  [20] VM_Operation::evaluate(0xdcf7f398, 0xc80e8, 0x28ef34, 0x28eb40, 0x28eb48,
0x7f9a91), at 0xfed768d4
  [21] VMThread::run(0xff130eac, 0x28eb48, 0x28ea98, 0x28ef34, 0xff13a924,
0xff13a920), at 0xfecdaae0
  [22] _start(0x28ea98, 0x4c80, 0x6400, 0x6710, 0x4c00, 0xff116000), at 0xfecda098

I also ran vtest with -server -XX:CompileThreshold=100 and -d64. So far
the failure only happens with -client -Xcomp.

###@###.### 2003-11-06