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Subjectkernel BUG at mm/swap.c:49
Can someone direct to whom I should send this kernel BUG or what else I 
should send as debugging information.

It looks like it might be an issue with Xorg and fglrx (ati drivers)

Feb 8 16:50:42 act kernel: kernel BUG at mm/swap.c:49!
Feb 8 16:50:42 act kernel: invalid operand: 0000 [#1]
Feb 8 16:50:42 act kernel: Modules linked in: fglrx binfmt_misc nfsd
exportfs lockd nfs_acl sunrpc parport_pc lp parport autofs4 ipv6 deflate
zlib_deflate twofish serpent aes blowfish des sha256 sha1 crypto_null
af_key snd_bt87x emu10k1_gp gameport snd_emu10k1_synth snd_emux_synth
snd_seq_virmidi snd_seq_midi_emul snd_seq_dummy snd_seq_oss snd_seq_midi
snd_seq_midi_event snd_seq snd_emu10k1 snd_rawmidi snd_seq_device
snd_util_mem snd_hwdep ohci1394 ieee1394 snd_intel8x0
snd_ac97_codec snd_ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_timer
snd soundcore snd_page_alloc forcedeth ehci_hcd ohci_hcd ide_cd cdrom
ide_disk ide_generic usb_storage nvidia_agp agpgart usbhid usbcore
tvaudio tuner msp3400 bttv video_buf firmware_class v4l2_common
btcx_risc tveeprom videodev i2c_algo_bit i2c_core amd74xx ide_core
joydev ext3 jbd mbcache sd_mod sata_sil libata scsi_mod shpchp
pci_hotplug evdev mousedev
Feb 8 16:50:42 act kernel: CPU: 0
Feb 8 16:50:42 act kernel: EIP: 0060:[put_page+78/105] Tainted:
P B VLI
Feb 8 16:50:42 act kernel: EFLAGS: 00213256 (2.6.15-1-k7)
Feb 8 16:50:42 act kernel: EIP is at put_page+0x4e/0x69
Feb 8 16:50:42 act kernel: eax: 00000000 ebx: c12e6560 ecx:
c12e6560 edx: c12e6560
Feb 8 16:50:42 act kernel: esi: d658d5a0 edi: 00000020 ebp:
b6968000 esp: da65be94
Feb 8 16:50:42 act kernel: ds: 007b es: 007b ss: 0068
Feb 8 16:50:42 act kernel: Process Xorg (pid: 4479, threadinfo=da65a000
task=daf54050)
Feb 8 16:50:42 act kernel: Stack: c013b59f c12e6560 c12e6560 dea10a20
ffffffff 00000000 b6968000 dda2fb68
Feb 8 16:50:42 act kernel: b6969000 dda2fb68 c013b6e9 c032443c
d942f6a4 dda2fb68 b6968000 b6969000
Feb 8 16:50:42 act kernel: da65bf14 00000000 dda2fb68 b6968000
d942f6a4 b6969000 da65bf48 c013b79f
Feb 8 16:50:42 act kernel: Call Trace:
Feb 8 16:50:42 act kernel: [zap_pte_range+358/476]
zap_pte_range+0x166/0x1dc
Feb 8 16:50:42 act kernel: [unmap_page_range+212/227]
unmap_page_range+0xd4/0xe3
Feb 8 16:50:42 act kernel: [unmap_vmas+167/339] unmap_vmas+0xa7/0x153
Feb 8 16:50:42 act kernel: [unmap_region+114/209] unmap_region+0x72/0xd1
Feb 8 16:50:42 act kernel: [do_munmap+201/232] do_munmap+0xc9/0xe8
Feb 8 16:50:42 act kernel: [sys_munmap+57/84] sys_munmap+0x39/0x54
Feb 8 16:50:42 act kernel: [sysenter_past_esp+84/117]
sysenter_past_esp+0x54/0x75
Feb 8 16:50:42 act kernel: Code: 00 46 a1 27 c0 83 42 04 ff 0f 98 c0 84
c0 74 35 8b 4a 30 89 54 24 04 ff e1 8b 02 89 d1 f6 c4 40 74 03 8b 4a 0c
8b 41 04 40 75 08 <0f> 0b 31 00 46 a1 27 c0 83 42 04 ff 0f 98 c0 84 c0
74 07 89 d0
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