OPERATING SYSTEM PATCHES
                 For All NetWare Operating Systems Version 2.0a
                To fix the GPI problems with file & record locks


PROBLEM

	A file server with 2.0a software will frequently get a General Protection Interrupt (GPI) error and halt when the workstations are running a file or record lock intensive application program.  The LAN is ARCNET or some other lower performance network.  The frequency of the GPI increases as the number of operating workstations increases.  With 6 workstations the error usually occurs within 20 minutes.  Upgrading the system to a faster LAN topology usually causes the problem to cease.

	Initially the problems were found by users of Softcraft's Btrieve which performs large numbers of physical record locks.  Potentially the problem could also exhibit itself with any other lock intensive application.    


CAUSE

	This problem was found to be caused by two bugs in the lock code in the operating system.  Although related, each of these two bugs would cause the file server to GPI at different places.  The bugs would only exhibit themselves when intensive record and/or file locking were performed on a lower performance network.

	The first bug is related to the number of reply buffers that are setup in the operating system.  The GPI is caused by the OS attempting to utilize more reply buffers than actually exist.

	The second bug occurs when a reply buffer is wrongly placed back on the available stack while it is actually still in use by the driver.


SOLUTION

	Patches have been formulated for the various NetWare operating systems that will correct the two bugs discussed above.  The patch can be performed using DOS DEBUG and must be performed to the NET$OS.OBJ file on the correct GENOS diskette before it is linked to the drivers.  A program that automatically implements the patch will soon be available.
	Each operating system type requires a different patch.  Patches have been formulated for the following operating systems:

		Non-Proprietary NetWare 286 Version 2.0a
		Proprietary NetWare 286 Version 2.0a
		Nondedicated NetWare 286 Version 2.0a
		Non-Proprietary NetWare SFT Level 1 Version 2.0a
		Proprietary NetWare SFT Level 1 Version 2.0a
		NetWare SFT Level 2 Version 2.0a
		SFT II NetWare with TTS Version 2.0a

	The patches each check to make sure that the operating system that is being patched matches the patch being used.  If any of the search command results do not match with what is shown, then see note 1 at the bottom of the page.  The segment numbers shown on the examples may be different than those you actually see when performing the patches.  Comments are in parenthesis to the side of DEBUG commands.

	It is important that you backup the diskette to be patched before you start.  This way, if any errors are made during implementation of the patch, you will still have the original unpatched files.
























Advanced Technical Services
NetWare Services Division
Novell, Inc.
May 6, 1987

                            OPERATING SYSTEM PATCH
                  For Non-Proprietary NetWare 286 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-2 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=242D  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2BB8  ES=2BB8  SS=2BB8  CS=2BB8  IP=0100   NV UP EI PL NZ NA PO NC
2BB8:0100 800800        OR      BYTE PTR [BX+SI],00                DS:0004=00 
-r ds   (Change register DS by adding 3000H to original value shown above)
DS 2BB8     (The segment numbers may be different than shown here)
:5bb8
-s 0 ffff 5d fb 5a 86 d6 5f    (Check to make sure you are using the right patch)
5BB8:F29D     (If the second number is different, see note 1 below)
-e f297
5BB8:F297  55.e9
5BB8:F298  B0.42   10.cc
-s 0 ffff 68 65 20 62 61 63
5BB8:9243     (If the second number is different, see note 1 below)
-e 9243
5BB8:9243  68.2e   65.00   20.55   62.b0   61.10
5BB8:9248  63.e8   6B.34   67.e6   72.5d   6F.80   75.7e   6E.08   64.00
5BB8:9250  20.75   63.f3   61.e9   63.b2   68.33   65.4b   20.75   77.09
5BB8:9258  72.58   69.8b   74.0e   65.6a   20.5d   70.41   72.e9   6F.cc
5BB8:9260  63.2b   65.e9   73.6c   73.2b
-s 0 ffff b9 fe ff 2b 4e 06
5BB8:E455     (If the second number is different, see note 1 below)
-e e456
5BB8:E456  FE.a0
-s 0 ffff 26 8c 4d 06 4b 75
5BB8:E534     (If the second number is different, see note 1 below)
-e e538
5BB8:E538  4B.e9   75.2d   A8.d4   58.e9   8B.2e   0E.d4
-s 0 ffff e3 5c 50 8b d9 9a
5BB8:E4DE     (If the second number is different, see note 1 below)
-e e4df
5BB8:E4DF  5C.5b
-w
Writing 4242D bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                            OPERATING SYSTEM PATCH
                    For Proprietary NetWare 286 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-2 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=2431  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2BB8  ES=2BB8  SS=2BB8  CS=2BB8  IP=0100   NV UP EI PL NZ NA PO NC
2BB8:0100 800900        OR      BYTE PTR [BX+DI],00                DS:0004=00
-r ds     (Change register DS by adding 3000H to original value shown above)
DS 2BB8     (The segment numbers may be different than shown here)
:5bb8
-s 0 ffff 5d fb 5a 86 d6 5f
5BB8:F2A1     (If the second number is different, see note 1 below)
-e f29b
5BB8:F29B  55.e9   B0.40   10.cc
-s 0 ffff 68 65 20 62 61 63
5BB8:9245     (If the second number is different, see note 1 below)
-e 9245
5BB8:9245  68.2e   65.00   20.55
5BB8:9248  62.b0   61.10   63.e8   6B.34   67.e6   72.5d   6F.80   75.7e
5BB8:9250  6E.08   64.00   20.75   63.f3   61.e9   63.b4   68.33   65.4b
5BB8:9258  20.75   77.09   72.58   69.8b   74.0e   65.6a   20.5d   70.41
5BB8:9260  72.e9   6F.ce   63.2b   65.e9   73.6e   73.2b
-s 0 ffff b9 fe ff 2b 4e 06
5BB8:E459     (If the second number is different, see note 1 below)
-e e45a
5BB8:E45A  FE.a0
-s 0 ffff 26 8c 4d 06 4b 75
5BB8:E538     (If the second number is different, see note 1 below)
-e e53c
5BB8:E53C  4B.e9   75.2b   A8.d4   58.e9
5BB8:E540  8B.2c   0E.d4
-s 0 ffff e3 5c 50 8b d9 9a
5BB8:E4E2     (If the second number is different, see note 1 below)
-e e4e3
5BB8:E4E3  5C.5b
-w
Writing 42431 bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                            OPERATING SYSTEM PATCH
                    For Nondedicated NetWare 286 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-2 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=477E  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2BB8  ES=2BB8  SS=2BB8  CS=2BB8  IP=0100   NV UP EI PL NZ NA PO NC
2BB8:0100 800900        OR      BYTE PTR [BX+DI],00                DS:0004=00 
-r ds     (Change register DS by adding 3000H to original value shown above)
DS 2BB8     (The segment numbers may be different than shown here)
:5bb8
-s 0 ffff 5d fb 5a 86 d6 5f
5BB8:FC34     (If the second number is different, see note 1 below)
-e fc2e
5BB8:FC2E  55.e9   B0.0f
5BB8:FC30  10.cc
-s 0 ffff 68 65 20 62 61 63
5BB8:9B65     (If the second number is different, see note 1 below)
-e 9b65
5BB8:9B65  68.2e   65.00   20.55
5BB8:9B68  62.b0   61.10   63.e8   6B.7e   67.e4   72.5d   6F.80   75.7e
5BB8:9B70  6E.08   64.00   20.75   63.f3   61.e9   63.e5   68.33   65.4b
5BB8:9B78  20.75   77.09   72.58   69.8b   74.0e   65.b2   20.5e   70.41
5BB8:9B80  72.e9   6F.ee   63.2b   65.e9   73.8e   73.2b
-s 0 ffff b9 fe ff 2b 4e 06                                                     
5BB8:EDD1     (If the second number is different, see note 1 below)
-e edd2
5BB8:EDD2  FE.a0                                                                
-s 0 ffff 26 8c 4d 06 4b 75                                                     
5BB8:EEB4     (If the second number is different, see note 1 below)
-e eeb8                                                                         
5BB8:EEB8  4B.e9   75.0b   A8.d4   58.e9   8B.0c   0E.d4                        
-s 0 ffff e3 5c 50 8b d9 9a                                                     
5BB8:EE5E     (If the second number is different, see note 1 below)
-e ee5f                                                                         
5BB8:EE5F  5C.5b                                                                
-w
Writing 4477E bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                            OPERATING SYSTEM PATCH
              For Non-Proprietary NetWare SFT Level 1 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-2 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=9D0C  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2B84  ES=2B84  SS=2B84  CS=2B84  IP=0100   NV UP EI PL NZ NA PO NC
2B84:0100 800800        OR      BYTE PTR [BX+SI],00                DS:0004=00
-r ds     (Change register DS by adding 4000H to original value shown above)
DS 2B84     (The segment numbers may be different than shown here)
:6b84
-s 0 9000 5d fb 5a 86 d6 5f
6B84:6AB2     (If the second number is different, see note 1 below)
-e 6aac
6B84:6AAC  55.e9   B0.30   10.cc
-s 0 9000 68 65 20 62 61 63
6B84:0A39     (If the second number is different, see note 1 below)
-e 0a39
6B84:0A39  68.2e   65.00   20.55   62.b0   61.10   63.e8   6B.16
6B84:0A40  67.d7   72.5d   6F.80   75.7e   6E.08   64.00   20.75   63.f3
6B84:0A48  61.e9   63.c4   68.33   65.4b   20.75   77.09   72.58   69.8b
6B84:0A50  74.0e   65.4a   20.62   70.41   72.e9   6F.de   63.2b   65.e9
6B84:0A58  73.7e   73.2b
-s 0 9000 b9 fe ff 2b 4e 06
6B84:5C60     (If the second number is different, see note 1 below)
-e 5c61
6B84:5C61  FE.a0
-s 0 9000 26 8c 4d 06 4b 75
6B84:5D43     (If the second number is different, see note 1 below)
-e 5d47
6B84:5D47  4B.e9
6B84:5D48  75.1b   A8.d4   58.e9   8B.1c   0E.d4
-s 0 9000 e3 5c 50 8b d9 9a
6B84:5CED     (If the second number is different, see note 1 below)
-e 5cee
6B84:5CEE  5C.5b
-w
Writing 49D0C bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                             OPERATING SYSTEM PATCH
                For Proprietary NetWare SFT Level 1 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-2 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=9D0C  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2B84  ES=2B84  SS=2B84  CS=2B84  IP=0100   NV UP EI PL NZ NA PO NC
2B84:0100 800900        OR      BYTE PTR [BX+DI],00                DS:0004=00
-r ds     (Change register DS by adding 4000H to original value shown above)
DS 2B84     (The segment numbers may be different than shown here)
:6b84
-s 0 9000 5d fb 5a 86 d6 5f
6B84:6AB5     (If the second number is different, see note 1 below)
-e 6aaf
6B84:6AAF  55.e9
6B84:6AB0  B0.2e   10.cc
-s 0 9000 68 65 20 62 61 63
6B84:0A3A     (If the second number is different, see note 1 below)
-e 0a3a
6B84:0A3A  68.2e   65.00   20.55   62.b0   61.10   63.e8
6B84:0A40  6B.16   67.d7   72.5d   6F.80   75.7e   6E.08   64.00   20.75
6B84:0A48  63.f3   61.e9   63.c6   68.33   65.4b   20.75   77.09   72.58
6B84:0A50  69.8b   74.0e   65.4a   20.62   70.41   72.e9   6F.e0   63.2b
6B84:0A58  65.e9   73.80   73.2b
-s 0 9000 b9 fe ff 2b 4e 06
6B84:5C63     (If the second number is different, see note 1 below)
-e 5c64
6B84:5C64  FE.a0
-s 0 9000 26 8c 4d 06 4b 75
6B84:5D46     (If the second number is different, see note 1 below)
-e 5d4a
6B84:5D4A  4B.e9   75.19   A8.d4   58.e9   8B.1a   0E.d4
-s 0 9000 e3 5c 50 8b d9 9a
6B84:5CF0     (If the second number is different, see note 1 below)
-e 5cf1
6B84:5CF1  5C.5b
-w
Writing 49D0F bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                            OPERATING SYSTEM PATCH
                      For NetWare SFT Level 2 Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-4 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0004  CX=E677  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2B83  ES=2B83  SS=2B83  CS=2B83  IP=0100   NV UP EI PL NZ NA PO NC
2B83:0100 800900        OR      BYTE PTR [BX+DI],00                DS:0004=00
-r ds     (Change register DS by adding 4000H to original value shown above)
DS 2B83     (The segment numbers may be different than shown here)
:6b83
-s 0 e000 5d fb 5a 86 d6 5f
6B83:A6B4     (If the second number is different, see note 1 below)
-e a6ae
6B83:A6AE  55.e9   B0.1d
6B83:A6B0  10.cb
-s 0 e000 68 65 20 62 61 63
6B83:4562     (If the second number is different, see note 1 below)
-e 4562
6B83:4562  68.2e   65.00   20.55   62.b0   61.10   63.e8
6B83:4568  6B.2a   67.c5   72.5d   6F.80   75.7e   6E.08   64.00   20.75
6B83:4570  63.f3   61.e9   63.d7   68.34   65.4b   20.75   77.09   72.58
6B83:4578  69.8b   74.0e   65.4e   20.64   70.41   72.e9   6F.e0   63.2c
6B83:4580  65.e9   73.80   73.2c
-s 0 e000 b9 fe ff 2b 4e 06
6B83:9851     (If the second number is different, see note 1 below)
-e 9852
6B83:9852  FE.a0
-s 0 e000 26 8c 4d 06 4b 75
6B83:9934     (If the second number is different, see note 1 below)
-e 9938
6B83:9938  4B.e9   75.19   A8.d3   58.e9   8B.1a   0E.d3
-s 0 e000 e3 5c 50 8b d9 9a
6B83:98DE     (If the second number is different, see note 1 below)
-e 98df
6B83:98DF  5C.5b
-w
Writing 4E677 bytes
-q

C:>

	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.
                            OPERATING SYSTEM PATCH
                    For SFT II NetWare with TTS Version 2.0a
                To fix the GPI problems with file & record locks

With the GENOS-4 diskette in drive A type:

C:> debug a:net$os.obj
-r     (Display Registers)
AX=0000  BX=0005  CX=4DDC  DX=0000  SP=FFEE  BP=0000  SI=0000  DI=0000
DS=2BB8  ES=2BB8  SS=2BB8  CS=2BB8  IP=0100   NV UP EI PL NZ NA PO NC
2BB8:0100 800900        OR      BYTE PTR [BX+DI],00                DS:0004=00
-r ds     (Change register DS by adding 4000H to original value shown above)
DS 2BB8     (The segment numbers may be different than shown here)
:6bb8
-s 0 ffff b9 fe ff 2b 4e 06
6BB8:FFB6     (If the second number is different, see note 1 below)
-e ffb7
6BB8:FFB7  FE.a0
-s 0 ffff 68 65 20 62 61 63
6BB8:8F5D     (If the second number is different, see note 1 below)
-e 8f5d                                                                         
6BB8:8F5D  68.2e   65.00   20.55
6BB8:8F60  62.b0   61.10   63.e8   6B.14   67.c4   72.5d   6F.80   75.7e
6BB8:8F68  6E.08   64.00   20.75   63.f3   61.e9   63.fb   68.57   65.4b
6BB8:8F70  20.75   77.09   72.58   69.8b   74.0e   65.34   20.67   70.41
6BB8:8F78  72.e9   6F.04   63.50   65.e9   73.a4   73.4f
-r ds     (Change register DS by again by adding an additional 1000H)
DS 6BB8     (The segment numbers may be different than shown here)
:7bb8
-s 0 ffff 5d fb 5a 86 d6 5f
7BB8:0E19     (If the second number is different, see note 1 below)
-e 0e13
7BB8:0E13  55.e9   B0.f9   10.a7
-s 0 ffff 26 8c 4d 06 4b 75
7BB8:0099     (If the second number is different, see note 1 below)
-e 9d
7BB8:009D  4B.e9   75.f5   A8.af
7BB8:00A0  58.e9   8B.f6   0E.af
-s 0 ffff e3 5c 50 8b d9 9a
7BB8:0043     (If the second number is different, see note 1 below)
-e 44
7BB8:0044  5C.5b
-w
Writing 54DDC bytes
-q

C:>
	The patch is now complete.  You can now use GENOS to configure your operating system.

Note 1:  If the second number is different when doing these checks then either the operating system has already been patched, the operating system is not version 2.0a, or you are using the wrong patch for the operating system you have.