Just to close this issue:
It looks like it was OptimizeIt. As an FYI to everyone, when JBoss crashes it writes a file Hs_err_pidXXX to your <jboss-server-home> directory. Looking at the file, it was obvious what the cause was. I removed the Optimize it libraries from our classpath and it seems to have fixed the lockup problem.
Here is our log:
An unexpected exception has been detected in native code outside the VM.
Unexpected Signal : EXCEPTION_ACCESS_VIOLATION (0xc0000005) occurred at PC=0x1C5F9A64
Function=oiiGetToolID+0x9904
Library=d:\Borland\JavaStudio\OptimizeitEntSuite\lib\pri.dll
Current Java thread:
at intuitive.audit.profiler.OIContext.stringBufferAllocatorEntered0(Native Method)
at intuitive.audit.profiler.OIContext.stringBufferAllocatorEntered(OIContext.java:257)
at java.util.LinkedList$ListItr.(LinkedList.java:468)
at java.util.LinkedList.listIterator(LinkedList.java:459)
at org.opennms.protocols.snmp.SnmpTimer$Scheduler.run(SnmpTimer.java:159)
- locked <0x11060bd8> (a java.lang.Object)
at java.lang.Thread.run(Thread.java:534)
Dynamic libraries:
0x00400000 - 0x00406000 d:\j2sdk1.4.2\bin\java.exe
0x77F80000 - 0x77FFD000 C:\WINNT\system32\ntdll.dll
0x7C2D0000 - 0x7C332000 C:\WINNT\system32\ADVAPI32.dll
0x7C570000 - 0x7C628000 C:\WINNT\system32\KERNEL32.DLL
0x77D30000 - 0x77DA1000 C:\WINNT\system32\RPCRT4.DLL
0x78000000 - 0x78045000 C:\WINNT\system32\MSVCRT.dll
0x08000000 - 0x08136000 d:\j2sdk1.4.2\jre\bin\client\jvm.dll
0x77E10000 - 0x77E75000 C:\WINNT\system32\USER32.dll
0x77F40000 - 0x77F7E000 C:\WINNT\system32\GDI32.DLL
0x77570000 - 0x775A0000 C:\WINNT\system32\WINMM.dll
0x10000000 - 0x10007000 d:\j2sdk1.4.2\jre\bin\hpi.dll
0x007C0000 - 0x007CE000 d:\j2sdk1.4.2\jre\bin\verify.dll
0x007D0000 - 0x007E8000 d:\j2sdk1.4.2\jre\bin\java.dll
0x007F0000 - 0x007FD000 d:\j2sdk1.4.2\jre\bin\zip.dll
0x1C1B0000 - 0x1C1CB000 d:\Borland\JavaStudio\OptimizeitEntSuite\lib\oii.dll
0x1C5E0000 - 0x1C613000 d:\Borland\JavaStudio\OptimizeitEntSuite\lib\pri.dll
0x1CB30000 - 0x1CB4C000 d:\j2sdk1.4.2\jre\bin\jdwp.dll
0x6D1D0000 - 0x6D1D5000 C:\Program Files\Oracle\jre\1.3.1\bin\dt_socket.dll
0x75030000 - 0x75044000 C:\WINNT\system32\ws2_32.dll
0x75020000 - 0x75028000 C:\WINNT\system32\WS2HELP.DLL
0x74FD0000 - 0x74FEE000 C:\WINNT\system32\msafd.dll
0x75010000 - 0x75017000 C:\WINNT\System32\wshtcpip.dll
0x20E60000 - 0x20F6A000 D:\j2sdk1.4.2\jre\bin\awt.dll
0x77800000 - 0x7781E000 C:\WINNT\system32\WINSPOOL.DRV
0x76620000 - 0x76630000 C:\WINNT\system32\MPR.DLL
0x75E60000 - 0x75E7A000 C:\WINNT\system32\IMM32.dll
0x77A50000 - 0x77B3F000 C:\WINNT\system32\ole32.dll
0x20F70000 - 0x20FC0000 D:\j2sdk1.4.2\jre\bin\fontmanager.dll
0x20FC0000 - 0x20FCF000 D:\j2sdk1.4.2\jre\bin\net.dll
0x782C0000 - 0x782CC000 C:\WINNT\System32\rnr20.dll
0x77980000 - 0x779A4000 C:\WINNT\system32\DNSAPI.DLL
0x75050000 - 0x75058000 C:\WINNT\system32\WSOCK32.DLL
0x77340000 - 0x77353000 C:\WINNT\system32\iphlpapi.dll
0x77520000 - 0x77525000 C:\WINNT\system32\ICMP.DLL
0x77320000 - 0x77337000 C:\WINNT\system32\MPRAPI.DLL
0x75150000 - 0x7515F000 C:\WINNT\system32\SAMLIB.DLL
0x75170000 - 0x751BF000 C:\WINNT\system32\NETAPI32.DLL
0x7C340000 - 0x7C34F000 C:\WINNT\system32\SECUR32.DLL
0x751C0000 - 0x751C6000 C:\WINNT\system32\NETRAP.DLL
0x77950000 - 0x7797A000 C:\WINNT\system32\WLDAP32.DLL
0x779B0000 - 0x77A4B000 C:\WINNT\system32\OLEAUT32.DLL
0x773B0000 - 0x773DF000 C:\WINNT\system32\ACTIVEDS.DLL
0x77380000 - 0x773A3000 C:\WINNT\system32\ADSLDPC.DLL
0x77830000 - 0x7783E000 C:\WINNT\system32\RTUTILS.DLL
0x77880000 - 0x7790E000 C:\WINNT\system32\SETUPAPI.DLL
0x7C0F0000 - 0x7C151000 C:\WINNT\system32\USERENV.DLL
0x774E0000 - 0x77513000 C:\WINNT\system32\RASAPI32.DLL
0x774C0000 - 0x774D1000 C:\WINNT\system32\RASMAN.DLL
0x77530000 - 0x77552000 C:\WINNT\system32\TAPI32.DLL
0x77B50000 - 0x77BD9000 C:\WINNT\system32\COMCTL32.DLL
0x63180000 - 0x631C8000 C:\WINNT\system32\SHLWAPI.DLL
0x77360000 - 0x77379000 C:\WINNT\system32\DHCPCSVC.DLL
0x777E0000 - 0x777E8000 C:\WINNT\System32\winrnr.dll
0x777F0000 - 0x777F5000 C:\WINNT\system32\rasadhlp.dll
0x21480000 - 0x214C3000 D:\Borland\JavaStudio\OptimizeitEntSuite\lib\auditjni.dll
0x2FC70000 - 0x2FC75000 D:\j2sdk1.4.2\jre\bin\rmi.dll
0x62F00000 - 0x62F0F000 D:\oracle\ora92\bin\ocijdbc9.dll
0x610A0000 - 0x6113F000 D:\oracle\ora92\bin\oracore9.dll
0x612A0000 - 0x61319000 D:\oracle\ora92\bin\oranls9.dll
0x613A0000 - 0x613B1000 D:\oracle\ora92\bin\oraunls9.dll
0x60600000 - 0x60784000 D:\oracle\ora92\bin\oraclient9.dll
0x60800000 - 0x60806000 D:\oracle\ora92\bin\oravsn9.dll
0x60500000 - 0x60590000 D:\oracle\ora92\bin\oracommon9.dll
0x30300000 - 0x30557000 D:\oracle\ora92\bin\orageneric9.dll
0x62FC0000 - 0x6303D000 D:\oracle\ora92\bin\oraxml9.dll
0x780A0000 - 0x780B2000 C:\WINNT\system32\MSVCIRT.dll
0x630F0000 - 0x63110000 D:\oracle\ora92\bin\oraxsd9.dll
0x615A0000 - 0x61629000 D:\oracle\ora92\bin\orannzsbb9.dll
0x61480000 - 0x61534000 D:\oracle\ora92\bin\oran9.dll
0x61400000 - 0x6142C000 D:\oracle\ora92\bin\oranl9.dll
0x61960000 - 0x61971000 D:\oracle\ora92\bin\oranldap9.dll
0x62000000 - 0x62024000 D:\oracle\ora92\bin\oraldapclnt9.dll
0x616B0000 - 0x616C7000 D:\oracle\ora92\bin\orancrypt9.dll
0x62300000 - 0x6233E000 D:\oracle\ora92\bin\ORATRACE9.dll
0x61730000 - 0x61766000 D:\oracle\ora92\bin\oranro9.dll
0x617C0000 - 0x617C6000 D:\oracle\ora92\bin\oranhost9.dll
0x617D0000 - 0x617D6000 D:\oracle\ora92\bin\oranoname9.dll
0x616A0000 - 0x616A6000 D:\oracle\ora92\bin\orancds9.dll
0x61820000 - 0x61827000 D:\oracle\ora92\bin\orantns9.dll
0x64000000 - 0x64007000 D:\oracle\ora92\bin\oranms.dll
0x64020000 - 0x64030000 D:\oracle\ora92\bin\oranmsp.dll
0x60A00000 - 0x60D13000 D:\oracle\ora92\bin\orapls9.dll
0x62500000 - 0x62507000 D:\oracle\ora92\bin\oraslax9.dll
0x61350000 - 0x61360000 D:\oracle\ora92\bin\orasnls9.dll
0x60810000 - 0x60816000 D:\oracle\ora92\bin\orawtc9.dll
0x62600000 - 0x62675000 D:\oracle\ora92\bin\orasql9.dll
0x61910000 - 0x6191C000 D:\oracle\ora92\bin\orantcp9.dll
0x61890000 - 0x6189D000 D:\oracle\ora92\bin\orannts9.dll
0x75500000 - 0x75504000 C:\WINNT\system32\security.dll
0x78280000 - 0x782B6000 C:\WINNT\system32\kerberos.dll
0x76670000 - 0x7667E000 C:\WINNT\system32\CRYPTDLL.DLL
0x77430000 - 0x77440000 C:\WINNT\system32\MSASN1.DLL
0x77920000 - 0x77943000 C:\WINNT\system32\imagehlp.dll
0x72A00000 - 0x72A2D000 C:\WINNT\system32\DBGHELP.dll
0x690A0000 - 0x690AB000 C:\WINNT\system32\PSAPI.DLL
Heap at VM Abort:
Heap
def new generation total 3136K, used 3136K [0x10010000, 0x10370000, 0x109e0000)
eden space 2816K, 100% used [0x10010000, 0x102d0000, 0x102d0000)
from space 320K, 100% used [0x102d0000, 0x10320000, 0x10320000)
to space 320K, 0% used [0x10320000, 0x10320000, 0x10370000)
tenured generation total 40280K, used 20475K [0x109e0000, 0x13136000, 0x18010000)
the space 40280K, 50% used [0x109e0000, 0x11ddeda8, 0x11ddee00, 0x13136000)
compacting perm gen total 24320K, used 24200K [0x18010000, 0x197d0000, 0x1c010000)
the space 24320K, 99% used [0x18010000, 0x197b2360, 0x197b2400, 0x197d0000)
Local Time = Wed Apr 21 01:00:39 2004
Elapsed Time = 45296
#
# The exception above was detected in native code outside the VM
#
# Java VM: Java HotSpot(TM) Client VM (1.4.2-b28 mixed mode)
#