Yesterday i got this oops with kernel 2.4.2 (SMP, without any additional 
patches).
Even though this is the first oops with 2.4.2, i got 3 oops in 4 days with 
2.4.1.

The machine was almost idle, running only mailsnarf, apache, postgresql and 
vmstat; without any load:
(output from vmstat):

r  b  w   swpd   free   buff  cache  si  so    bi    bo   in    cs  us  sy  id
0  0  0   12     7428  24844   3980   0   0     0     0  586   912   0   2  98


Attached are the plain oops, the ksymoops'ed oops, the dmesg and the lsmod 
output (the only one module loaded, megaraid, is loaded at boot time).
If you need any other info, just ask.

Thanks,
        Alberto