Met this bug on $ uname -a Linux qzhou-TP 3.8.0-19-generic #29-Ubuntu SMP Wed Apr 17 18:16:28 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux call trace is: [ 17.563586] BUG: unable to handle kernel paging request at ffff88012e6cffe0 [ 17.563612] IP: [] patch_generic_hdmi+0xe0/0x550 [snd_hda_codec_hdmi] [ 17.563631] PGD 1c0e063 PUD bf769067 PMD 12e13e063 PTE 800000012e6cf161 [ 17.563646] Oops: 0003 [#1] SMP [ 17.563656] Modules linked in: snd_hda_codec_hdmi arc4(F) iwldvm snd_hda_codec_conexant snd_hda_intel(+) snd_hda_codec coretemp joydev(F) kvm_intel mac80211 snd_hwdep(F) snd_pcm(F) thinkpad_acpi nvram(F) snd_page_alloc(F) snd_seq_midi(F) snd_seq_midi_event(F) kvm snd_rawmidi(F) iwlwifi snd_seq(F) mei cfg80211 snd_seq_device(F) snd_timer(F) tpm_tis snd(F) psmouse(F) dm_multipath(F) scsi_dh(F) microcode(F) soundcore(F) lpc_ich intel_ips mac_hid serio_raw(F) lp(F) parport(F) ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) xts(F) lrw(F) gf128mul(F) ablk_helper(F) cryptd(F) nouveau sdhci_pci sdhci firewire_ohci firewire_core crc_itu_t(F) mxm_wmi wmi video(F) i2c_algo_bit ttm drm_kms_helper drm ahci(F) libahci(F) e1000e(F) [ 17.563746] CPU 3 [ 17.563750] Pid: 563, comm: modprobe Tainted: GF 3.8.0-19-generic #29-Ubuntu LENOVO 2537CP3/2537CP3 [ 17.563756] RIP: 0010:[] [] patch_generic_hdmi+0xe0/0x550 [snd_hda_codec_hdmi] [ 17.563763] RSP: 0000:ffff880130cb9ac0 EFLAGS: 00010283 [ 17.563767] RAX: 0000000000000008 RBX: 0000000000000004 RCX: 0000000000000004 [ 17.563771] RDX: ffff88012e6cffd8 RSI: ffff88012e6cffe0 RDI: ffff88012d6be420 [ 17.563775] RBP: ffff880130cb9af8 R08: 0000000000000001 R09: 0000000000000002 [ 17.563778] R10: 0000000000000000 R11: 0000000000000000 R12: ffff88012d6be000 [ 17.563782] R13: 0000000000000000 R14: 0000000000000004 R15: ffff88012e6d0000 [ 17.563787] FS: 00007f946346b740(0000) GS:ffff880137d80000(0000) knlGS:0000000000000000 [ 17.563791] CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b [ 17.563795] CR2: ffff88012e6cffe0 CR3: 0000000130839000 CR4: 00000000000007e0 [ 17.563799] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 [ 17.563803] DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 [ 17.563807] Process modprobe (pid: 563, threadinfo ffff880130cb8000, task ffff88012def9740) [ 17.563811] Stack: [ 17.563813] 00000000ffffffff ffffffffa0560004 ffffffffa055e3a8 0000000000000000 [ 17.563819] ffff88012d6be000 00000000ffffffff ffffffffa0560000 ffff880130cb9b58 [ 17.563825] ffffffffa052f186 2d6164682d646e73 64692d6365646f63 303030656430313a [ 17.563832] Call Trace: [ 17.563842] [] snd_hda_codec_configure+0x146/0x440 [snd_hda_codec] [ 17.563850] [] azx_probe_continue+0x3a0/0x4f0 [snd_hda_intel] [ 17.563857] [] ? azx_attach_pcm_stream+0x1e0/0x1e0 [snd_hda_intel] [ 17.563867] [] ? azx_halt+0x30/0x30 [snd_hda_intel] [ 17.563873] [] ? azx_pcm_trigger+0x580/0x580 [snd_hda_intel] [ 17.563879] [] ? azx_runtime_suspend+0x30/0x30 [snd_hda_intel] [ 17.563885] [] ? azx_pcm_free+0x50/0x50 [snd_hda_intel] [ 17.563891] [] azx_probe+0x35a/0x940 [snd_hda_intel] [ 17.563898] [] local_pci_probe+0x4b/0x80 [ 17.564386] [] pci_device_probe+0x111/0x120 [ 17.565180] [] driver_probe_device+0x77/0x230 [ 17.565979] [] __driver_attach+0xab/0xb0 [ 17.566771] [] ? driver_probe_device+0x230/0x230 [ 17.567561] [] bus_for_each_dev+0x5d/0xa0 [ 17.568346] [] driver_attach+0x1e/0x20 [ 17.569125] [] bus_add_driver+0x190/0x280 [ 17.569903] [] ? 0xffffffffa0580fff [ 17.570668] [] driver_register+0x77/0x170 [ 17.571441] [] ? 0xffffffffa0580fff [ 17.572204] [] __pci_register_driver+0x4c/0x50 [ 17.572971] [] azx_driver_init+0x1e/0x1000 [snd_hda_intel] [ 17.573752] [] do_one_initcall+0x12a/0x180 [ 17.574524] [] load_module+0x10c7/0x1520 [ 17.575277] [] ? unset_module_init_ro_nx+0x80/0x80 [ 17.576011] [] sys_init_module+0xc5/0xf0 [ 17.576729] [] system_call_fastpath+0x1a/0x1f [ 17.577421] Code: 0f 1f 00 4d 8b bc 24 c0 00 00 00 25 00 e0 00 00 c1 e8 0c 83 c8 01 49 63 17 83 c0 01 83 f8 10 48 8d 14 92 49 8d 14 d7 48 8d 72 08 <66> 89 5a 08 c7 46 08 02 00 00 00 0f 86 5b 02 00 00 48 8d 4e 18 [ 17.578916] RIP [] patch_generic_hdmi+0xe0/0x550 [snd_hda_codec_hdmi] [ 17.579647] RSP [ 17.580371] CR2: ffff88012e6cffe0 [ 17.581076] ---[ end trace 6cf5a9b52841282a ]---