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