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Regular system crash: how do I start to track the problem down?

How do I start to find out what is making our Linux machines crash.
The machine are SGI 1450 servers and have 4x700MHz Xeon ( 2 MB cache)
processors and 8GB memory
This is a Red Hat 7.2 install with a kernel upgraded to 2.4.18-27.7.xbigmem

Unable to handle kernel NULL pointer dereference at virtual address 0000007c
*pde = 19f73001
*pte = 00000000
Oops: 0000
mvfs nfs lockd sunrpc bcm5700 usb-ohci usbcore ext3 jbd aic7xxx sd_mod
CPU:    1
EIP:    0010:[<c0125b0d>]    Tainted: PF
EFLAGS: 00010202

EIP is at access_process_vm [kernel] 0x2d (2.4.18-27.7.xbigmem)
eax: 00000000   ebx: f12eb880   ecx: d7632000   edx: d7632000
esi: bffff98c   edi: d7632000   ebp: ecf58000   esp: e959df04
ds: 0018   es: 0018   ss: 0018
Process ps (pid: 1838, stackpage=e959d000)
Stack: ce445180 ecf58000 00000000 00000212 f51f7900 c9b2c870 00000212
       00000000 f12eb880 bffff98c d7632000 ecf58000 c0164c32 d7632000
       ecf58000 00000666 00000000 ce445980 000007ff c016501c d7632000
Call Trace: [<c0164c32>] proc_pid_environ [kernel] 0x52 (0xe959df38))
[<c016501c>] proc_info_read [kernel] 0x4c (0xe959df58))
[<c0145126>] fput [kernel] 0xc6 (0xe959df64))
[<c0144166>] sys_read [kernel] 0x96 (0xe959df7c))
[<c0143af7>] sys_open [kernel] 0x57 (0xe959dfac))
[<c0108c93>] system_call [kernel] 0x33 (0xe959dfc0))

Code: f6 40 7c 01 74 07 3d a0 de 2f c0 75 08 c7 44 24 08 00 00 00 
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