Test case:
java/lang/management/MemoryMXBean/CollectionUsageThresholdConcMarkSweepGC.sh

VM crash info:

# An unexpected error has been detected by HotSpot Virtual Machine:
#
#  Internal Error (/PrtBuildDir/workspace/src/share/vm/memory/concurrentMarkSweepGeneration.cpp, 1784), pid=31380, tid=1079327088
#
# Java VM: Java HotSpot(TM) 64-Bit Server VM (20050607083738.dcubed.service_hs_merge-debug mixed mode)
#
# Error: assert(_sweep_timer.seconds() > 0,"For error-free division")

---------------  T H R E A D  ---------------

Current thread (0x0000002aa8636018):  VMThread [id=31384]

Stack: [0x0000000040454000,0x0000000040554000),  sp=0x0000000040552c30,  free space=1019k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.so+0x9a3590];;  _ZN7VMError14report_and_dieEv+0x1b0
V  [libjvm.so+0x40ba0e];;  _Z24report_assertion_failurePKciS0_+0x6e
V  [libjvm.so+0x3d460b];;  _ZN12CMSCollector18do_compaction_workEi+0x50b
V  [libjvm.so+0x3d3ac8];;  _ZN12CMSCollector27acquire_control_and_collectEii+0x2d8
V  [libjvm.so+0x3d374d];;  _ZN12CMSCollector7collectEiimi+0x1ad
V  [libjvm.so+0x3d3593];;  _ZN29ConcurrentMarkSweepGeneration7collectEiimi+0x13
V  [libjvm.so+0x471a3a];;  _ZN16GenCollectedHeap13do_collectionEiimiiPi+0x87a
V  [libjvm.so+0x473183];;  _ZN16GenCollectedHeap18do_full_collectionEiiPi+0x53
V  [libjvm.so+0x9a48fa];;  _ZN17VM_GenCollectFull4doitEv+0xaa
V  [libjvm.so+0x9ca669];;  _ZN12VM_Operation8evaluateEv+0x99
V  [libjvm.so+0x9c974c];;  _ZN8VMThread18evaluate_operationEP12VM_Operation+0x7c
V  [libjvm.so+0x9c9b3b];;  _ZN8VMThread4loopEv+0x27b
V  [libjvm.so+0x9c9470];;  _ZN8VMThread3runEv+0xc0
V  [libjvm.so+0x7e1b14];;  _Z6_startP6Thread+0x154

On amd64 sweep time may be less than a second.
###@###.### 2005-06-08 17:39:02 GMT