I just found this in my log files after booting 2.3.1 for the first time:
Unable to handle kernel NULL pointer dereference at virtual address 00000004
current->tss.cr3 = 048c3000, %cr3 = 048c3000
*pde = 00000000
Oops: 0000
CPU: 1
EIP: 0010:[ide-cd:ide_cdrom_init+-83421/616]
EFLAGS: 00010212
eax: 00000000 ebx: 00000000 ecx: 00000040 edx: 00000802
esi: c6c28f84 edi: 00000300 ebp: 00000001 esp: c37bbf68
ds: 0018 es: 0018 ss: 0018
Process rmmod (pid: 392, process nr: 44, stackpage=c37bb000)
Stack: 00000001 c37ba000 00000040 00000001 00000000 c6c28ec0 c6c2474e 00000000
c6c20000 c6c20000 c011813c c6c20000 c6c1a000 00000001 c0117794 c6c20000
00000001 c37ba000 00000002 0804dea9 bffffd78 c37bbfc4 c0107a64 00000000
Call Trace: [ide-cd:ide_cdrom_init+-56184/616] [ide-cd:ide_cdrom_init+-74474/616] [ide-cd:ide_cdrom_init+-92728/616] [ide-cd:ide_cdrom_init+-92728/616] [free_module+32/148] [ide-cd:ide_cdrom_init+-92728/616] [ide-cd:ide_cdrom_init+-117304/616]
[sys_delete_module+424/500] [ide-cd:ide_cdrom_init+-92728/616] [system_call+52/64]
Code: 83 7c d8 04 00 7e 3c 8b 4c 24 1c 31 c0 8a 81 7c 01 00 00 66
MCE
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