I experiences a lot of abends and faulted address spaces on my NetWare 6.5 SP8 GroupWise 8 HP2 server and found out that this was because of the gwdcaw process:

 9-08-2009  21:05:51 :    SERVER-5.70-2187  [nmID=D0006]
     Removed address space because of memory protection violation
     Address Space:   GWDCAW.PO_SCP11
     Reason:          Free detected corrupt preceeding redzone for node
     0xD1F53F80
     Running Thread:  gwdca1-wrkr
     EIP:             0x97AFACF8 (???.NLM + 0x0)

9-08-2009  21:45:36 :    SERVER-5.70-2187  [nmID=D0006]
     Removed address space because of memory protection violation
     Address Space:   GWDCAW.PO_SCP11
     Reason:          Page Fault, Attempt to read from non-present page
     Running Thread:  gwdca1-wrkr
     EIP:             0x00000000 (???.NLM + 0x0)
     Access Location:

9-08-2009  22:53:36 :    SERVER-5.70-2187  [nmID=D0006]
     Removed address space because of memory protection violation
     Address Space:   GWDCAW.PO_SCP11
     Reason:          Detected user thread hogging the CPU
     Running Thread:  gwdca1-wrkr
     EIP:             0xF53566BE (USERLIB.NLM + 0x36BE)

9-08-2009  22:53:40 :    SERVER-5.70-2187  [nmID=D0006]
     Removed address space because of memory protection violation
     Address Space:   GWDCAW.PO_SCP12
     Reason:          Page Fault, Attempt to write to non-present page
     Running Thread:  gwdca2-wrkr
     EIP:             0xF5355146 (USERLIB.NLM + 0x2146)

And also abends in the abend.log:

Novell Open Enterprise Server, NetWare 6.5
PVER: 6.50.08

Address space GWDCAW.PO_SCP11 removed Monday, 10 August 2009   0:10:51,133
Abend 0 on P00: Server-5.70.08: Page Fault Processor Exception (Error code 00000004)

Registers:
    CS = 001B DS = 0023 ES = 0023 FS = 0023 GS = 0023 SS = 0023
    EAX = C095F9E0 EBX = C45BA000 ECX = C45BA000 EDX = C45BA000
    ESI = 00000041 EDI = C095F9E0 EBP = C1938F38 ESP = C1938E94
    EIP = F53558A5 FLAGS = 00010246
    F53558A5 8B42F8         MOV     EAX, [EDX-08]=?
    EIP in USERLIB.NLM at code start +000028A5h
    Access Location: 0xC45B9FF8

...<cut>...
Additional Information:
    The CPU encountered a problem executing code in USERLIB.NLM.  The problem may be in that module or in data passed to that module by a process owned by SERVER.NLM.
...<cut>...

Novell Open Enterprise Server, NetWare 6.5
PVER: 6.50.08

Address space GWDCAW.PO_SCP11 removed Monday, 10 August 2009   0:10:51,133
Abend 0 on P00: Server-5.70.08: Page Fault Processor Exception (Error code 00000004)

Registers:
    CS = 001B DS = 0023 ES = 0023 FS = 0023 GS = 0023 SS = 0023
    EAX = C095F9E0 EBX = C45BA000 ECX = C45BA000 EDX = C45BA000
    ESI = 00000041 EDI = C095F9E0 EBP = C1938F38 ESP = C1938E94
    EIP = F53558A5 FLAGS = 00010246
    F53558A5 8B42F8         MOV     EAX, [EDX-08]=?
    EIP in USERLIB.NLM at code start +000028A5h
    Access Location: 0xC45B9FF8

...<cut>...
   Stack dump exceeded the valid memory limit

Additional Information:
    The CPU encountered a problem executing code in SERVER.NLM.  The problem may be in that module or in data passed to that module by a process owned by SERVER.NLM.
...<cut>...

The process named is the document converter process which was originally not created for running on NetWare. This process is causing the abends and memory space page faults. You can disable the process by adding the undocumented switch /nodca to the poa startup file:

LOAD SYS:\SYSTEM\GWPOA @PO_1.POA /nodca

Novell acknowledges the problem in these two TIDs, so keep track of them to see if the issue is yet resolved:
NetWare server abends when trying to index PDF files (7002158) ERROR: "Document Convert Agent is unable to service requests" while loading the POA (7002353)