lusearch hangs with the production build

I have run the lusearch with GenCopy production build for two times(two invocations with each one run). The maximum heap size is 60M. The first time the benchmark passed without problem. But for the second time, the benchmark hangs without any error message. I suspect the problem may have something to do with GenCopy.

The following is the trace:

start time: Tue Nov 10 15:36:30 CET 2009
Command executed(1 x): /work/jikesrvm-3.1.0-original/dist/production_ia32-linux/rvm -Xmx60M -jar lib/dacapo-2006-10-MR2.jar -s default -n 1 -c MMTkCallback lusearch
===== DaCapo lusearch starting =====
4 query batches completed
8 query batches completed
12 query batches completed
16 query batches completed
20 query batches completed
24 query batches completed
28 query batches completed
32 query batches completed
============================ MMTk Statistics Totals ============================
GC refType scan finalize prepare precopy stacks root forwardrelease init finish majorGC majorGCTime time.mu time.gc perf.mu perf.gc
452 10.22 1105.69 3.21 13.39 16.56 214.44 349.54 0.00 5.96 6.60 3.97 9 731.17 16135.53 1749.66 0 0
Total time: 17885.20 ms
------------------------------ End MMTk Statistics -----------------------------
===== DaCapo lusearch PASSED in 17885 msec =====
end time: Tue Nov 10 15:37:00 CET 2009
start time: Tue Nov 10 15:37:45 CET 2009
Command executed(1 x): /work/jikesrvm-3.1.0-original/dist/production_ia32-linux/rvm -Xmx60M -jar lib/dacapo-2006-10-MR2.jar -s default -n 1 -c MMTkCallback lusearch
===== DaCapo lusearch starting =====
hangs.....

The CPU info:
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 14
model name : Genuine Intel(R) CPU T1300 @ 1.66GHz
stepping : 8
cpu MHz : 1000.000
cache size : 2048 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 10
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat clflush dts acpi mmx fxsr sse sse2 ss tm pbe nx constant_tsc up arch_perfmon bts pni monitor vmx est tm2 xtpr
bogomips : 3324.96
clflush size : 64
power management: