oops with 2.4.20aa1 & VM

I had another oops with 2.4.19 on the same machine, but I don't have it anymore.

ksymoops 2.4.8 on i686 2.4.20aa1. Options used
-V (default)
-k /proc/ksyms (default)
-l /proc/modules (default)
-o /lib/modules/2.4.20aa1/ (default)
-m /boot/System.map-2.4.20aa1 (default)

Warning: You did not tell me where to find symbol information. I will assume that the log matches the kernel and modules that are running right now and I'll use the default options above for symbol resolution. If the current kernel and/or modules do not match the log, you can get more accurate output by telling me the kernel version and where to find map, modules, ksyms etc. ksymoops -h explains the options.

May  1 16:29:50 fileserver kernel: Unable to handle kernel NULL pointer dereference at virtual address 0000001b
May  1 16:29:50 fileserver kernel: c01405a3
May  1 16:29:50 fileserver kernel: *pde = 00000000
May  1 16:29:50 fileserver kernel: Oops: 0000 2.4.20aa1 #1 SMP Mon Dec 23 14:03:16 PST 2002
May  1 16:29:50 fileserver kernel: CPU:    1
May  1 16:29:50 fileserver kernel: EIP:    0010:[try_to_release_page+35/80]    Not tainted
May  1 16:29:50 fileserver kernel: EFLAGS: 00010282
May  1 16:29:50 fileserver kernel: eax: ffffffff   ebx: c12f1d18   ecx: 000001d0   edx: 00000001
May  1 16:29:50 fileserver kernel: esi: 000001d0   edi: 00000012   ebp: 00000000   esp: dffcdf38
May  1 16:29:50 fileserver kernel: ds: 0018   es: 0018   ss: 0018
May  1 16:29:50 fileserver kernel: Process kswapd (pid: 7, stackpage=dffcd000)
May  1 16:29:50 fileserver kernel: Stack: dde7a250 c12f1d18 c0135b76 c12f1d18 000001d0 00000020 000001d0 c02dce1c 
May  1 16:29:50 fileserver kernel:        c02dce1c dffcc000 00000c80 00003096 000001d0 c02dce1c c0135f9c dffcdfa4 
May  1 16:29:50 fileserver kernel:        0000003c 000001d0 00000020 c0136008 dffcdfa4 c02dce1c 00000001 dffcc000 
May  1 16:29:50 fileserver kernel: Call Trace:    [shrink_cache+646/1152] [shrink_caches+60/80] [try_to_free_pages_zone+88/240] [kswapd_balance_pgdat+87/160] [kswapd_balance+22/48]
May  1 16:29:50 fileserver kernel: Code: 83 78 1c 00 74 17 56 53 8b 40 1c ff d0 83 c4 08 85 c0 75 09 

Using defaults from ksymoops -t elf32-i386 -a i386

Code; 00000000 Before first symbol
00000000 <_EIP>:
Code; 00000000 Before first symbol
0: 83 78 1c 00 cmpl $0x0,0x1c(%eax)
Code; 00000004 Before first symbol
4: 74 17 je 1d <_EIP+0x1d>
Code; 00000006 Before first symbol
6: 56 push %esi
Code; 00000007 Before first symbol
7: 53 push %ebx
Code; 00000008 Before first symbol
8: 8b 40 1c mov 0x1c(%eax),%eax
Code; 0000000b Before first symbol
b: ff d0 call *%eax
Code; 0000000d Before first symbol
d: 83 c4 08 add $0x8,%esp
Code; 00000010 Before first symbol
10: 85 c0 test %eax,%eax
Code; 00000012 Before first symbol
12: 75 09 jne 1d <_EIP+0x1d>

1 warning issued. Results may not be reliable.
00:00.0 Host bridge: ServerWorks CNB20LE Host Bridge (rev 05) 00:00.1 Host bridge: ServerWorks CNB20LE Host Bridge (rev 05) 00:02.0 PCI bridge: Intel Corp. 80960RM [i960RM Bridge] (rev 01) 00:08.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 00:0e.0 VGA compatible controller: ATI Technologies Inc 3D Rage IIC (rev 7a) 00:0f.0 ISA bridge: ServerWorks OSB4 South Bridge (rev 4f) 00:0f.2 USB Controller: ServerWorks OSB4/CSB5 OHCI USB Controller (rev 04) 01:04.0 SCSI storage controller: Adaptec AHA-2940U2/U2W / 7890/7891 (rev 01) 01:06.0 SCSI storage controller: Adaptec AIC-7880U (rev 02) 02:06.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 02:08.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) Personalities : [linear] [raid0] [raid1] [raid5]
read_ahead 1024 sectors
md1 : active raid1 sdb1[0] sda1[1]

      48064 blocks [2/2] [UU]

md0 : active raid5 sdf2[4] sde2[3] sdd2[2] sdc2[1] sdb3[0] sda3[5]

      88397120 blocks level 5, 32k chunk, algorithm 2 [6/6] [UUUUUU]

unused devices: <none>
processor : 0
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 3
cpu MHz : 664.586
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1327.10

processor : 1
vendor_id : GenuineIntel
cpu family : 6
model : 8
model name : Pentium III (Coppermine)
stepping : 3
cpu MHz : 664.586
cache size : 256 KB
fdiv_bug : no
hlt_bug : no
f00f_bug : no
coma_bug : no
fpu : yes
fpu_exception : yes
cpuid level : 2
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 mmx fxsr sse
bogomips : 1327.10