[2.4] Nforce2 oops and occasional hang (tried the lockups patch, no difference)

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I've posted this a couple of times, with no response.

So long as memory pressure is kept to a minimum, the system is stable. 
Running without swap and without serious work kept it going for a couple
of weeks.

Running (currently with the nforce2-lockups patches and HZ=1000 but no
APIC/IO-APIC) results in the same oopses as every kernel I've tried,
including 2.4.22.

Suggestions? I'd really love to be able to use this thing reliably under
Linux :(

Unable to handle kernel NULL pointer dereference at virtual address 00000089
c012dff7
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0010:[<c012dff7>]    Tainted: P
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010206
eax: 00000081   ebx: cff72b58   ecx: cee3a000   edx: 0000cad6
esi: 00001000   edi: cbabd9b4   ebp: 00000081   esp: cee3bf08
ds: 0018   es: 0018   ss: 0018
Process giftd (pid: 29738, stackpage=cee3b000)
Stack: c03155c0 c238b1c0 c44671c0 00000038 cee3a000 00000eea 00000000 00000000
       00000116 cbabd900 c012e6a0 cee3bf74 c2974660 c2974640 00001000 00001000
       00000000 00000000 c012e7f2 c2974640 c2974660 cee3bf74 c012e6a0 c0222e67
Call Trace:    [<c012e6a0>] [<c012e7f2>] [<c012e6a0>] [<c0222e67>] [<c013d413>]
  [<c0108fdf>]
Code: 39 78 08 74 05 8b 40 10 eb f2 39 68 0c 75 f6 85 c0 89 c6 0f
 
 
>>EIP; c012dff7 <do_generic_file_read+157/4e0>   <=====
 
>>ebx; cff72b58 <_end+fc02f6c/104a5494>
>>ecx; cee3a000 <_end+eaca414/104a5494>
>>edi; cbabd9b4 <_end+b74ddc8/104a5494>
>>esp; cee3bf08 <_end+eacc31c/104a5494>
 
Trace; c012e6a0 <file_read_actor+0/a0>
Trace; c012e7f2 <generic_file_read+b2/1a0>
Trace; c012e6a0 <file_read_actor+0/a0>
Trace; c0222e67 <sys_send+37/40>
Trace; c013d413 <sys_read+a3/110>
Trace; c0108fdf <system_call+33/38>
 
Code;  c012dff7 <do_generic_file_read+157/4e0>
00000000 <_EIP>:
Code;  c012dff7 <do_generic_file_read+157/4e0>   <=====
   0:   39 78 08                  cmp    %edi,0x8(%eax)   <=====
Code;  c012dffa <do_generic_file_read+15a/4e0>
   3:   74 05                     je     a <_EIP+0xa>
Code;  c012dffc <do_generic_file_read+15c/4e0>
   5:   8b 40 10                  mov    0x10(%eax),%eax
Code;  c012dfff <do_generic_file_read+15f/4e0>
   8:   eb f2                     jmp    fffffffc <_EIP+0xfffffffc>
Code;  c012e001 <do_generic_file_read+161/4e0>
   a:   39 68 0c                  cmp    %ebp,0xc(%eax)
Code;  c012e004 <do_generic_file_read+164/4e0>
   d:   75 f6                     jne    5 <_EIP+0x5>
Code;  c012e006 <do_generic_file_read+166/4e0>
   f:   85 c0                     test   %eax,%eax
Code;  c012e008 <do_generic_file_read+168/4e0>
  11:   89 c6                     mov    %eax,%esi
Code;  c012e00a <do_generic_file_read+16a/4e0>
  13:   0f 00 00                  sldtl  (%eax)

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