What I did was to call settings of the flashplayer and press on the
webcam symbol there. The system didn't crash, just this oops:

BUG: unable to handle kernel NULL pointer dereference at virtual address 0000006
5
 printing eip:
c01875b0
*pde = 00000000
Oops: 0000 [#1]
PREEMPT SMP 
Modules linked in: tuner tvaudio msp3400 bttv video_buf firmware_class ir_common
 compat_ioctl32 btcx_risc tveeprom videodev v4l2_common nfs vfat fat nfsd export
fs lockd sunrpc snd_pcm_oss snd_mixer_oss snd_seq_oss snd_seq_midi_event snd_seq
 snd_seq_device reiserfs rtc microcode radeon drm intel_agp agpgart snd_intel8x0
 snd_ac97_codec snd_ac97_bus snd_pcm snd_timer snd soundcore snd_page_alloc sd_m
od usb_storage libusual usbhid uhci_hcd usbcore e100
CPU:    0
EIP:    0060:[<c01875b0>]    Not tainted VLI
EFLAGS: 00010292   (2.6.18-rc1 #80) 
EIP is at sysfs_add_file+0x10/0x76
eax: 00000001   ebx: f9bd6d14   ecx: 00000004   edx: f9bd6d14
esi: f9bde920   edi: 00000001   ebp: dc489eac   esp: dc489e94
ds: 007b   es: 007b   ss: 0068
Process modprobe (pid: 11377, ti=dc489000 task=f21ff6b0 task.ti=dc489000)
Stack: f9bde920 f9bde920 00000004 f9bde920 f9bde920 00000000 dc489eb4 c018763c 
       dc489ebc c0220cc3 dc489ec8 f9bc3073 c19b4800 dc489ee4 f9bc35de 00000000 
       20bd7818 f9bd7880 f9bd7880 ffffffed dc489ef0 c01c3c1b c19b4800 dc489f04 
Call Trace:
 [<c018763c>] sysfs_create_file+0x26/0x28
 [<c0220cc3>] class_device_create_file+0x14/0x1a
 [<f9bc3073>] bttv_register_video+0x8c/0x147 [bttv]
 [<f9bc35de>] bttv_probe+0x4ab/0x593 [bttv]
 [<c01c3c1b>] pci_call_probe+0xd/0x10
 [<c01c3c4f>] __pci_device_probe+0x31/0x43
 [<c01c3c82>] pci_device_probe+0x21/0x34
 [<c0220429>] driver_probe_device+0x47/0x94
 [<c0220542>] __driver_attach+0x5e/0x89
 [<c021fada>] bus_for_each_dev+0x38/0x5d
 [<c0220581>] driver_attach+0x14/0x16
 [<c021ff2c>] bus_add_driver+0x5f/0x98
 [<c02209a8>] driver_register+0x75/0x7a
 [<c01c3e3e>] __pci_register_driver+0x4f/0x5d
 [<f9bc3b3b>] bttv_init_module+0x9f/0xa1 [bttv]
 [<c01325f7>] sys_init_module+0x95/0x1c5
 [<c010291b>] syscall_call+0x7/0xb
 [<b7ea781e>] 0xb7ea781e
Code: 01 00 00 00 6a 00 e8 f9 cf f8 ff 89 d8 e8 2f 40 fe ff 5b 8d 65 f4 5b 5e 5f
 5d c3 55 89 e5 57 89 c7 56 53 89 d3 83 ec 0c 89 4d f0 <8b> 40 64 89 45 ec 8b 47
 1c 05 84 00 00 00 0f b7 72 08 c7 45 e8 
EIP: [<c01875b0>] sysfs_add_file+0x10/0x76 SS:ESP 0068:dc489e94


Gentoo, Firefox 1.5-r4, xorg 7.0-r1, Shockwave Flash 7.0 r63 plugin,
Linux Kernel from Linus GIT: e2b209509ca33743864846aef2e1b2afc21f7915
Config and full dmesg attached