I just had an oops today with 2.4.21.
I've ran it through ksymoops:
Unable to handle kernel NULL pointer dereference at virtual
address 00000000
c013d06f
*pde = 00000000
Oops: 0002
CPU: 0
EIP: 0010:[<c013d06f>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010286
eax: c060dc54 ebx: c060dc3c ecx: 00000000 edx: c05f5bd0
esi: c060dc24 edi: ca1f8bc0 ebp: 00000179 esp: c123ff60
ds: 0018 es: 0018 ss: 0018
Process kswapd (pid: 5, stackpage=c123f000)
Stack: 00000001 000001d0 00000001 00000005 c013d38b 0000049a c01271e7 00000005
000001d0 00000005 000001d0 c02be394 00000000 c02be394 c0127232 00000001
c02be394 00000001 c123e000 c0127331 c02be2e0 00000000 c123e249 0008e000
Call Trace: [<c013d38b>] [<c01271e7>] [<c0127232>] [<c0127331>] [<c0127396>]
[<c01274ad>] [<c010553c>]
Code: 89 11 89 46 30 89 40 04 8b 46 4c 85 c0 74 12 8b 40 14 85 c0
>>EIP; c013d06f <prune_dcache+af/148> <=====
>>eax; c060dc54 <END_OF_CODE+2b32b0/????>
>>ebx; c060dc3c <END_OF_CODE+2b3298/????>
>>edx; c05f5bd0 <END_OF_CODE+29b22c/????>
>>esi; c060dc24 <END_OF_CODE+2b3280/????>
>>edi; ca1f8bc0 <END_OF_CODE+9e9e21c/????>
>>esp; c123ff60 <END_OF_CODE+ee55bc/????>
Trace; c013d38b <shrink_dcache_memory+1b/34>
Trace; c01271e7 <shrink_caches+67/80>
Trace; c0127232 <try_to_free_pages_zone+32/50>
Trace; c0127331 <kswapd_balance_pgdat+41/8c>
Trace; c0127396 <kswapd_balance+1a/30>
Trace; c01274ad <kswapd+99/bc>
Trace; c010553c <arch_kernel_thread+28/38>
Code; c013d06f <prune_dcache+af/148>
00000000 <_EIP>:
Code; c013d06f <prune_dcache+af/148> <=====
0: 89 11 mov %edx,(%ecx) <=====
Code; c013d071 <prune_dcache+b1/148>
2: 89 46 30 mov %eax,0x30(%esi)
Code; c013d074 <prune_dcache+b4/148>
5: 89 40 04 mov %eax,0x4(%eax)
Code; c013d077 <prune_dcache+b7/148>
8: 8b 46 4c mov 0x4c(%esi),%eax
Code; c013d07a <prune_dcache+ba/148>
b: 85 c0 test %eax,%eax
Code; c013d07c <prune_dcache+bc/148>
d: 74 12 je 21 <_EIP+0x21> c013d090 <prune_dcache+d0/148>
Code; c013d07e <prune_dcache+be/148>
f: 8b 40 14 mov 0x14(%eax),%eax
Code; c013d081 <prune_dcache+c1/148>
12: 85 c0 test %eax,%eax
Kurt
PS: I'm not on the list, so please CC me.