AGP oops on rmmod

[Daniel Ritz]

maybe already know...kernel is 2.5.56

modprobe apggart
modprobe intel-agp
-> lsmod shows 'em
rmmod intel-agp
-> produces that one:

Unable to handle kernel NULL pointer dereference at virtual address 00000000
 printing eip:
00000000
*pde = 00000000
Oops: 0000
CPU:    0
EIP:    0060:[<00000000>]    Not tainted
EFLAGS: 00010246
EIP is at 0x0
eax: 00000000   ebx: d0891220   ecx: c0290ac4   edx: 00000000
esi: c5f7e000   edi: 00000000   ebp: c5f7ff54   esp: c5f7ff50
ds: 007b   es: 007b   ss: 0068
Process rmmod (pid: 2100, threadinfo=c5f7e000 task=c9b48d80)
Stack: d0895246 c5f7ff60 d0895379 d089527c c5f7ff68 d088f648 c5f7ffbc c0128225
       bffff884 65746e69 67615f6c c0290a84 65746e69 67615f6c cbe10070 c9ccd3b4
       00001000 c9ccd3d4 c99572b4 c5f7ffbc c01379dc c9ccd3b4 40016000 00001000
Call Trace:
 [<d0895246>] agp_backend_cleanup+0xa/0x2f76adc4 [agpgart]
 [<d0895379>] agp_unregister_driver+0x21/0x2f76aca8 [agpgart]
 [<d089527c>] agp_power+0x0/0x2f76ad84 [agpgart]
 [<d088f648>] +0x8/0x2f7709c0 [intel_agp]
 [<c0128225>] sys_delete_module+0x1b5/0x1d8
 [<c01379dc>] sys_munmap+0x44/0x64
 [<c010a89b>] syscall_call+0x7/0xb

Code:  Bad EIP value.

machine is a toshiba tecra 8000 laptop, p3-500, lspci:
00:00.0 Host bridge: Intel Corporation 440BX/ZX - 82443BX/ZX Host bridge (AGP disabled) (rev 03)
00:04.0 VGA compatible controller: Neomagic Corporation [MagicMedia 256AV] (rev 12)
00:05.0 Bridge: Intel Corporation 82371AB PIIX4 ISA (rev 02)
00:05.1 IDE interface: Intel Corporation 82371AB PIIX4 IDE (rev 01)
00:05.2 USB Controller: Intel Corporation 82371AB PIIX4 USB (rev 01)
00:05.3 Bridge: Intel Corporation 82371AB PIIX4 ACPI (rev 02)
00:09.0 Communication controller: Toshiba America Info Systems FIR Port (rev 23)
00:0b.0 CardBus bridge: Toshiba America Info Systems ToPIC97 (rev 05)
00:0b.1 CardBus bridge: Toshiba America Info Systems ToPIC97 (rev 05)

as you can see the chipset has agp disabled.