The test provided demonstrates the problem by using Javascript to show a web page with the test applet and then resizes the web page repeatedly until a crash occurs.

Note: Although this test is a heavy load test, users experience it intermittantly when just resizing the browser in every-day use.

This is very easy to reproduce in modern HyperThreading Petium processors, or on multi-processor systems. We've been unable to reproduce it so far on single-processor boxes with no HT. In the case of HT, switching HT off in the BIOS stops the crash from happening.

The following log is produced by the crash:


# An unexpected error has been detected by HotSpot Virtual Machine:
#
# EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d0c2b9f, pid=2484, tid=3320
#
# Java VM: Java HotSpot(TM) Client VM (1.5.0-beta2-b50 mixed mode, sharing)
# Problematic frame:
# C [awt.dll+0xc2b9f]
#

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

Current thread (0x069b4e98): JavaThread "AWT-Windows" daemon [_thread_in_native, id=3320]

siginfo: ExceptionCode=0xc0000005, reading address 0x07561008

Registers:
EAX=0x00020010, EBX=0x0755d730, ECX=0x07560fa4, EDX=0x00000002
ESP=0x06e9f76c, EBP=0x0000038b, ESI=0x07561000, EDI=0xfffffffe
EIP=0x6d0c2b9f, EFLAGS=0x00010287

Top of Stack: (sp=0x06e9f76c)
0x06e9f76c: 0000000f 07479608 77e7d142 00000000
0x06e9f77c: 9f0410a6 07479608 0755d830 0755d810
0x06e9f78c: 6d0bda84 00000000 6d0c11bd 00000000
0x06e9f79c: 06e9f878 000204fe 06e9f804 00000000
0x06e9f7ac: 00000001 00000000 069b4f54 069b4f54
0x06e9f7bc: 069b4e98 06e9f7f8 77d7390a 77d99b08
0x06e9f7cc: 06e9f7f8 6d0f2a68 00000000 6d0c04b8
0x06e9f7dc: 0000000f 00000000 00000000 06e9f878

Instructions: (pc=0x6d0c2b9f)
0x6d0c2b8f: 33 ed 03 f3 3b c5 89 6c 24 18 89 6c 24 1c 76 44
0x6d0c2b9f: 8b 46 08 8b 3e 8b 56 04 2b c7 8b 7e 0c 2b fa 85


Stack: [0x06da0000,0x06ea0000), sp=0x06e9f76c, free space=1021k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
C [awt.dll+0xc2b9f]

[error occurred during error reporting, step 120, id 0xc0000005]

Java frames: (J=compiled Java code, j=interpreted, Vv=VM code)
j sun.awt.windows.WToolkit.eventLoop()V+0
j sun.awt.windows.WToolkit.run()V+69
j java.lang.Thread.run()V+11
v ~StubRoutines::call_stub

--------------- P R O C E S S ---------------

Java Threads: ( => current thread )
  0x0752e3f8 JavaThread "AWT-EventQueue-2" [_thread_blocked, id=3308]
  0x0752e068 JavaThread "thread applet-testcrash/Applet1.class" [_thread_blocked, id=1452]
  0x069c2938 JavaThread "AWT-EventQueue-0" [_thread_blocked, id=3304]
  0x069c1920 JavaThread "traceMsgQueueThread" [_thread_blocked, id=3284]
=>0x069b4e98 JavaThread "AWT-Windows" daemon [_thread_in_native, id=3320]
  0x069b4a70 JavaThread "AWT-Shutdown" [_thread_blocked, id=3272]
  0x069b3758 JavaThread "Java2D Disposer" daemon [_thread_blocked, id=3252]
  0x026d01d8 JavaThread "Low Memory Detector" daemon [_thread_blocked, id=2468]
  0x026ceee8 JavaThread "CompilerThread0" daemon [_thread_blocked, id=2644]
  0x026ce150 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=1056]
  0x026cac00 JavaThread "Finalizer" daemon [_thread_blocked, id=1584]
  0x026ca078 JavaThread "Reference Handler" daemon [_thread_blocked, id=2776]
  0x026208d8 JavaThread "main" [_thread_in_native, id=2548]

Other Threads:
  0x026c77d8 VMThread [id=3112]
  0x026d15b0 WatcherThread [id=2504]

VM state:not at safepoint (normal execution)

VM Mutex/Monitor currently owned by a thread: None

Heap
 def new generation total 576K, used 299K [0x20a60000, 0x20b00000, 0x211c0000)
  eden space 512K, 58% used [0x20a60000, 0x20aaac30, 0x20ae0000)
  from space 64K, 0% used [0x20ae0000, 0x20ae00f0, 0x20af0000)
  to space 64K, 0% used [0x20af0000, 0x20af0000, 0x20b00000)
 tenured generation total 1408K, used 899K [0x211c0000, 0x21320000, 0x26a60000)
   the space 1408K, 63% used [0x211c0000, 0x212a0f70, 0x212a1000, 0x21320000)
 compacting perm gen total 8192K, used 1152K [0x26a60000, 0x27260000, 0x2aa60000)
   the space 8192K, 14% used [0x26a60000, 0x26b80140, 0x26b80200, 0x27260000)
    ro space 8192K, 62% used [0x2aa60000, 0x2af5e5d0, 0x2af5e600, 0x2b260000)
    rw space 12288K, 46% used [0x2b260000, 0x2b7e61e0, 0x2b7e6200, 0x2be60000)

Dynamic libraries:
0x00400000 - 0x00419000 C:\Program Files\Internet Explorer\iexplore.exe
0x77f50000 - 0x77ff7000 C:\WINDOWS\System32\ntdll.dll
0x77e60000 - 0x77f46000 C:\WINDOWS\system32\kernel32.dll
0x77c10000 - 0x77c63000 C:\WINDOWS\system32\msvcrt.dll
0x77d40000 - 0x77dcc000 C:\WINDOWS\system32\USER32.dll
0x77c70000 - 0x77cb0000 C:\WINDOWS\system32\GDI32.dll
0x77dd0000 - 0x77e5d000 C:\WINDOWS\system32\ADVAPI32.dll
0x78000000 - 0x78086000 C:\WINDOWS\system32\RPCRT4.dll
0x70a70000 - 0x70ad5000 C:\WINDOWS\system32\SHLWAPI.dll
0x71700000 - 0x71849000 C:\WINDOWS\System32\SHDOCVW.dll
0x71950000 - 0x71a34000 C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.10.0_x-ww_f7fb5805\comctl32.dll
0x773d0000 - 0x77bc2000 C:\WINDOWS\system32\SHELL32.dll
0x77340000 - 0x773cb000 C:\WINDOWS\system32\comctl32.dll
0x771b0000 - 0x772d1000 C:\WINDOWS\system32\ole32.dll
0x5ad70000 - 0x5ada4000 C:\WINDOWS\System32\uxtheme.dll
0x74720000 - 0x74764000 C:\WINDOWS\System32\MSCTF.dll
0x10000000 - 0x1000f000 C:\Program Files\RealVNC\WinVNC\VNCHooks.dll
0x71500000 - 0x715fd000 C:\WINDOWS\System32\BROWSEUI.dll
0x72430000 - 0x72442000 C:\WINDOWS\System32\browselc.dll
0x75f40000 - 0x75f5f000 C:\WINDOWS\system32\appHelp.dll
0x76fd0000 - 0x77048000 C:\WINDOWS\System32\CLBCATQ.DLL
0x77120000 - 0x771ab000 C:\WINDOWS\system32\OLEAUT32.dll
0x77050000 - 0x77115000 C:\WINDOWS\System32\COMRes.dll
0x77c00000 - 0x77c07000 C:\WINDOWS\system32\VERSION.dll
0x63000000 - 0x63096000 C:\WINDOWS\system32\WININET.dll
0x762c0000 - 0x76348000 C:\WINDOWS\system32\CRYPT32.dll
0x762a0000 - 0x762b0000 C:\WINDOWS\system32\MSASN1.dll
0x76f90000 - 0x76fa0000 C:\WINDOWS\System32\Secur32.dll
0x76670000 - 0x76757000 C:\WINDOWS\System32\SETUPAPI.dll
0x76620000 - 0x7666e000 C:\WINDOWS\System32\cscui.dll
0x76600000 - 0x7661b000 C:\WINDOWS\System32\CSCDLL.dll
0x00e30000 - 0x00ee8000 c:\program files\google\googletoolbar1.dll
0x1a400000 - 0x1a47a000 C:\WINDOWS\system32\urlmon.dll
0x71ad0000 - 0x71ad8000 C:\WINDOWS\System32\WSOCK32.dll
0x71ab0000 - 0x71ac5000 C:\WINDOWS\System32\WS2_32.dll
0x71aa0000 - 0x71aa8000 C:\WINDOWS\System32\WS2HELP.dll
0x76c30000 - 0x76c5b000 C:\WINDOWS\System32\WINTRUST.dll
0x76c90000 - 0x76cb2000 C:\WINDOWS\system32\IMAGEHLP.dll
0x76b40000 - 0x76b6c000 C:\WINDOWS\System32\WINMM.dll
0x0ffd0000 - 0x0fff3000 C:\WINDOWS\System32\rsaenh.dll
0x76ee0000 - 0x76f17000 C:\WINDOWS\System32\RASAPI32.DLL
0x76e90000 - 0x76ea1000 C:\WINDOWS\System32\rasman.dll
0x71c20000 - 0x71c6e000 C:\WINDOWS\System32\NETAPI32.dll
0x76eb0000 - 0x76edb000 C:\WINDOWS\System32\TAPI32.dll
0x76e80000 - 0x76e8d000 C:\WINDOWS\System32\rtutils.dll
0x722b0000 - 0x722b5000 C:\WINDOWS\System32\sensapi.dll
0x75a70000 - 0x75b15000 C:\WINDOWS\system32\USERENV.dll
0x010b0000 - 0x010b8000 C:\Program Files\Adobe\Acrobat 5.0\Reader\ActiveX\AcroIEHelper.ocx
0x75e90000 - 0x75f37000 C:\WINDOWS\System32\SXS.DLL
0x76170000 - 0x761f8000 C:\WINDOWS\System32\shdoclc.dll
0x74770000 - 0x747ff000 C:\WINDOWS\System32\mlang.dll
0x71a50000 - 0x71a8b000 C:\WINDOWS\system32\mswsock.dll
0x71a90000 - 0x71a98000 C:\WINDOWS\System32\wshtcpip.dll
0x01780000 - 0x01981000 C:\WINDOWS\System32\msi.dll
0x76f20000 - 0x76f45000 C:\WINDOWS\System32\DNSAPI.dll
0x76fb0000 - 0x76fb7000 C:\WINDOWS\System32\winrnr.dll
0x76f60000 - 0x76f8c000 C:\WINDOWS\system32\WLDAP32.dll
0x76fc0000 - 0x76fc5000 C:\WINDOWS\System32\rasadhlp.dll
0x63580000 - 0x63830000 C:\WINDOWS\System32\mshtml.dll
0x746f0000 - 0x74716000 C:\WINDOWS\System32\msimtf.dll
0x76390000 - 0x763ac000 C:\WINDOWS\System32\IMM32.DLL
0x6b700000 - 0x6b790000 c:\windows\system32\jscript.dll
0x746c0000 - 0x746e7000 C:\WINDOWS\System32\MSLS31.DLL
0x73300000 - 0x73375000 c:\windows\system32\vbscript.dll
0x02870000 - 0x02a17000 C:\WINDOWS\System32\macromed\flash\Flash.ocx
0x763b0000 - 0x763f5000 C:\WINDOWS\system32\comdlg32.dll
0x72d20000 - 0x72d29000 C:\WINDOWS\System32\wdmaud.drv
0x72d10000 - 0x72d18000 C:\WINDOWS\System32\msacm32.drv
0x77be0000 - 0x77bf4000 C:\WINDOWS\System32\MSACM32.dll
0x77bd0000 - 0x77bd7000 C:\WINDOWS\System32\midimap.dll
0x6d430000 - 0x6d439000 C:\WINDOWS\System32\ddrawex.dll
0x73760000 - 0x737a4000 C:\WINDOWS\System32\DDRAW.dll
0x73bc0000 - 0x73bc6000 C:\WINDOWS\System32\DCIMAN32.dll
0x71b20000 - 0x71b31000 C:\WINDOWS\system32\MPR.dll
0x75f60000 - 0x75f66000 C:\WINDOWS\System32\drprov.dll
0x71c10000 - 0x71c1d000 C:\WINDOWS\System32\ntlanman.dll
0x71cd0000 - 0x71ce6000 C:\WINDOWS\System32\NETUI0.dll
0x71c90000 - 0x71ccc000 C:\WINDOWS\System32\NETUI1.dll
0x71c80000 - 0x71c86000 C:\WINDOWS\System32\NETRAP.dll
0x71bf0000 - 0x71c01000 C:\WINDOWS\System32\SAMLIB.dll
0x75f70000 - 0x75f79000 C:\WINDOWS\System32\davclnt.dll
0x73d70000 - 0x73d82000 C:\WINDOWS\System32\shgina.dll
0x75970000 - 0x75a61000 C:\WINDOWS\System32\MSGINA.dll
0x76360000 - 0x7636f000 C:\WINDOWS\System32\WINSTA.dll
0x037d0000 - 0x03802000 C:\WINDOWS\System32\ODBC32.dll
0x1f850000 - 0x1f866000 C:\WINDOWS\System32\odbcint.dll
0x74cb0000 - 0x74d1f000 C:\WINDOWS\System32\mshtmled.dll
0x71d40000 - 0x71d5b000 C:\WINDOWS\System32\actxprxy.dll
0x6d580000 - 0x6d591000 C:\Program Files\Java\jre1.5.0\bin\npjpi150.dll
0x5edd0000 - 0x5edea000 C:\WINDOWS\System32\OLEPRO32.DLL
0x6d3f0000 - 0x6d407000 C:\Program Files\Java\jre1.5.0\bin\jpiexp32.dll
0x6d440000 - 0x6d458000 C:\Program Files\Java\jre1.5.0\bin\jpishare.dll
0x6d630000 - 0x6d7b4000 C:\PROGRA~1\Java\JRE15~1.0\bin\client\jvm.dll
0x6d280000 - 0x6d288000 C:\PROGRA~1\Java\JRE15~1.0\bin\hpi.dll
0x76bf0000 - 0x76bfb000 C:\WINDOWS\System32\PSAPI.DLL
0x6d600000 - 0x6d60c000 C:\PROGRA~1\Java\JRE15~1.0\bin\verify.dll
0x6d2f0000 - 0x6d30d000 C:\PROGRA~1\Java\JRE15~1.0\bin\java.dll
0x6d620000 - 0x6d62f000 C:\PROGRA~1\Java\JRE15~1.0\bin\zip.dll
0x6d000000 - 0x6d166000 C:\Program Files\Java\jre1.5.0\bin\awt.dll
0x73000000 - 0x73023000 C:\WINDOWS\System32\WINSPOOL.DRV
0x73940000 - 0x73a07000 C:\WINDOWS\System32\D3DIM700.DLL
0x6d240000 - 0x6d27e000 C:\Program Files\Java\jre1.5.0\bin\fontmanager.dll
0x6d1f0000 - 0x6d202000 C:\Program Files\Java\jre1.5.0\bin\deploy.dll
0x6d5c0000 - 0x6d5dd000 C:\Program Files\Java\jre1.5.0\bin\RegUtils.dll
0x6d3d0000 - 0x6d3e4000 C:\Program Files\Java\jre1.5.0\bin\jpicom32.dll
0x6d4b0000 - 0x6d4c3000 C:\Program Files\Java\jre1.5.0\bin\net.dll
0x6cc60000 - 0x6cc6b000 C:\WINDOWS\System32\dispex.dll

VM Arguments:
jvm_args: -Xbootclasspath/a:C:\PROGRA~1\Java\JRE15~1.0\lib\deploy.jar;C:\PROGRA~1\Java\JRE15~1.0\lib\plugin.jar -Xmx96m -Djavaplugin.maxHeapSize=96m -Xverify:remote -Djavaplugin.version=1.5.0 -Djavaplugin.nodotversion=150 -Dbrowser=sun.plugin -DtrustProxy=true -Dapplication.home=C:\PROGRA~1\Java\JRE15~1.0 -Djava.protocol.handler.pkgs=sun.plugin.net.protocol -Djavaplugin.vm.options=-Djava.class.path=C:\PROGRA~1\Java\JRE15~1.0\classes -Xbootclasspath/a:C:\PROGRA~1\Java\JRE15~1.0\lib\deploy.jar;C:\PROGRA~1\Java\JRE15~1.0\lib\plugin.jar -Xmx96m -Djavaplugin.maxHeapSize=96m -Xverify:remote -Djavaplugin.version=1.5.0 -Djavaplugin.nodotversion=150 -Dbrowser=sun.plugin -DtrustProxy=true -Dapplication.home=C:\PROGRA~1\Java\JRE15~1.0 -Djava.protocol.handler.pkgs=sun.plugin.net.protocol vfprintf
java_command: <unknown>

Environment Variables:
PATH=C:\PROGRA~1\Java\JRE15~1.0\bin;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\Program Files\Executive Software\DiskeeperLite\;C:\Program Files\Common Files\Roxio Shared\DLLShared;C:\Program Files\Internet Explorer;;.
USERNAME=daven
OS=Windows_NT
PROCESSOR_IDENTIFIER=x86 Family 15 Model 2 Stepping 9, GenuineIntel


--------------- S Y S T E M ---------------

OS: Windows XP Build 2600 Service Pack 1

CPU:total 2 family 15, cmov, cx8, fxsr, mmx, sse, sse2, ht

Memory: 4k page, physical 1030888k(527996k free), swap 2484012k(2114240k free)

vm_info: Java HotSpot(TM) Client VM (1.5.0-beta2-b50) for windows-x86, built on May 5 2004 02:07:14 by "java_re" with MS VC++ 6.0