Kernel tainted

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Hello, I see that my kernel is tainted but I don't know which module
to blame. The taint code is 4096, so it must be a out-of-tree module.
I have listed all modules, and all seem to be in-tree, I have used
this command:

# lsmod | awk {'print $1'} | xargs modinfo | grep intree

and all modules have intree: Y

I have examined the kernel logs, but can't find why the kernel is
tainted. I haven't compiled any kernel module myself, all are bundled
in Fedora 16 default kernel.

How can I debug this? These are the modules loaded:

Module                  Size  Used by
tcp_lp                 12663  0
fuse                   77538  3
ppdev                  17635  0
parport_pc             28082  0
lp                     17874  0
parport                44515  3 ppdev,parport_pc,lp
ebtable_nat            12807  0
ebtables               30649  1 ebtable_nat
ipt_MASQUERADE         12880  3
iptable_nat            13383  1
nf_nat                 25322  2 ipt_MASQUERADE,iptable_nat
xt_CHECKSUM            12549  1
iptable_mangle         12695  1
tun                    22768  3
lockd                  84578  0
bridge                 90784  0
stp                    12823  1 bridge
llc                    14090  2 bridge,stp
rfcomm                 68661  4
bnep                   19570  2
ip6t_REJECT            12939  1
nf_conntrack_ipv6      14290  19
nf_defrag_ipv6         18139  1 nf_conntrack_ipv6
ip6table_filter        12815  1
ip6_tables             26976  1 ip6table_filter
nf_conntrack_netbios_ns    12665  0
nf_conntrack_broadcast    12527  1 nf_conntrack_netbios_ns
nf_conntrack_ipv4      14622  32 iptable_nat,nf_nat
nf_defrag_ipv4         12673  1 nf_conntrack_ipv4
xt_state               12578  48
nf_conntrack           82331  8
ipt_MASQUERADE,iptable_nat,nf_nat,nf_conntrack_ipv6,nf_conntrack_netbios_ns,nf_conntrack_broadcast,nf_conntrack_ipv4,xt_state
sunrpc                235041  2 lockd
snd_hda_codec_hdmi     36277  1
snd_hda_codec_realtek   231881  1
arc4                   12529  2
raid456                68735  1
async_raid6_recov      17112  1 raid456
async_pq               13278  2 raid456,async_raid6_recov
raid6_pq               87918  2 async_raid6_recov,async_pq
async_xor              12917  3 raid456,async_raid6_recov,async_pq
xor                    12849  1 async_xor
async_memcpy           12603  2 raid456,async_raid6_recov
async_tx               13254  5
raid456,async_raid6_recov,async_pq,async_xor,async_memcpy
uvcvideo               71509  0
videodev               97776  1 uvcvideo
ir_lirc_codec          13021  0
media                  20408  2 uvcvideo,videodev
lirc_dev               19504  1 ir_lirc_codec
v4l2_compat_ioctl32    16726  1 videodev
ir_mce_kbd_decoder     13248  0
ir_sony_decoder        12713  0
ir_jvc_decoder         12751  0
ir_rc6_decoder         12833  0
ir_rc5_decoder         12710  0
ir_nec_decoder         12915  0
mceusb                 17920  0
rc_core                26635  8
ir_lirc_codec,ir_mce_kbd_decoder,ir_sony_decoder,ir_jvc_decoder,ir_rc6_decoder,ir_rc5_decoder,ir_nec_decoder,mceusb
snd_usb_audio         125353  1
snd_usbmidi_lib        24763  1 snd_usb_audio
snd_rawmidi            29530  1 snd_usbmidi_lib
eeepc_wmi              12826  0
asus_wmi               23919  1 eeepc_wmi
sparse_keymap          13526  1 asus_wmi
ath5k                 149828  0
ath                    23089  1 ath5k
btusb                  23904  2
bluetooth             244750  23 rfcomm,bnep,btusb
mac80211              439421  1 ath5k
snd_hda_intel          33276  2
snd_hda_codec         114615  3
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_hda_intel
microcode              23240  0
cfg80211              194802  3 ath5k,ath,mac80211
snd_hwdep              17611  2 snd_usb_audio,snd_hda_codec
snd_seq                64807  0
iTCO_wdt               17948  0
snd_seq_device         14129  2 snd_rawmidi,snd_seq
iTCO_vendor_support    13419  1 iTCO_wdt
rfkill                 21410  5 asus_wmi,bluetooth,cfg80211
i2c_i801               17765  0
snd_pcm                97100  4
snd_hda_codec_hdmi,snd_usb_audio,snd_hda_intel,snd_hda_codec
r8169                  60789  0
mii                    13527  1 r8169
snd_timer              28815  2 snd_seq,snd_pcm
snd                    74425  18
snd_hda_codec_hdmi,snd_hda_codec_realtek,snd_usb_audio,snd_usbmidi_lib,snd_rawmidi,snd_hda_intel,snd_hda_codec,snd_hwdep,snd_seq,snd_seq_device,snd_pcm,snd_timer
soundcore              14484  1 snd
snd_page_alloc         18101  2 snd_hda_intel,snd_pcm
virtio_net             22936  0
kvm_intel             132336  3
kvm                   401177  1 kvm_intel
uinput                 17606  0
mxm_wmi                12823  0
wmi                    18697  2 asus_wmi,mxm_wmi
usb_storage            56207  0
i915                  452926  4
drm_kms_helper         40141  1 i915
drm                   225894  5 i915,drm_kms_helper
i2c_algo_bit           13156  1 i915
i2c_core               37955  6
videodev,i2c_i801,i915,drm_kms_helper,drm,i2c_algo_bit
video                  18932  1 i915
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