Running named on Netware 6.5 SP5 with nw65os5a.exe.

Server has master replica, DNS/DHCP running and SLPDA.

Any idea why this abend's occurring ?
Server's 3 days running, than this abend comes again.

Server NDSI halted Friday, 7 July 2006 13.59.20,980
Abend 1 on P00: Server-5.70.05: Page Fault Processor Exception (Error code 00000000)

Registers:
CS = 0060 DS = 007B ES = 007B FS = 007B GS = 007B SS = 0068
EAX = 00000000 EBX = 7FFFFFD5 ECX = FFFFFFFF EDX = 00000015
ESI = 00000000 EDI = 00000000 EBP = 9682E7C7 ESP = 989937C4
EIP = 8FADBA7A FLAGS = 00010246
8FADBA7A F2AE REPNE SCASB
EIP in CLIB.NLM at code start +00004A7Ah
Access Location: 0x00000000

The violation occurred while processing the following instruction:
8FADBA7A F2AE REPNE SCASB
8FADBA7C F7D1 NOT ECX
8FADBA7E 49 DEC ECX
8FADBA7F 8B442408 MOV EAX, [ESP+08]
8FADBA83 01C8 ADD EAX, ECX
8FADBA85 8944240C MOV [ESP+0C], EAX
8FADBA89 E926F1FFFF JMP 8FADABB4
8FADBA8E 8B442408 MOV EAX, [ESP+08]
8FADBA92 8A00 MOV AL, [EAX]
8FADBA94 8B742408 MOV ESI, [ESP+08]



Running process: DNSThreadTaskMgr2 Process
Thread Owned by NLM: NAMED.NLM
Stack pointer: 98993ABC
OS Stack limit: 98963B80
Scheduling priority: 67371008
Wait state: 5050010 Blocked on a Mutex