alsa : unable to handle kernel NULL pointer dereference at virtual address 00000001

[ld]

I was looking in dmesg, and I've go this

[ 35.094483] saa7134 ALSA driver for DMA sound loaded
[ 35.094508] saa7134[0]/alsa: saa7134[0] at 0xd2011000 irq 21 registered as card -2
[ 35.094574] BUG: unable to handle kernel NULL pointer dereference at virtual address 00000001
[ 35.094578] printing eip: f8a78745 *pde = 00000000
[ 35.094582] Oops: 0000 [#1] SMP
[ 35.094584] Modules linked in: saa7134_alsa serio_raw pcspkr tuner tea5767 tda8290 tuner_simple mt20xx tea5761 k8temp shpchp saa7134 pci_hotplug compat_ioctl32 videobuf_dma_sg videobuf_core ir_kbd_i2c ir_common evdev videodev v4l2_common v4l1_compat snd_intel8x0 snd_ac97_codec ac97_bus snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event button snd_seq snd_timer snd_seq_device snd soundcore i2c_nforce2 snd_page_alloc i2c_core iptable_nat nf_nat nf_conntrack_ipv4 nf_conntrack iptable_mangle iptable_filter ip_tables x_tables ext3 jbd mbcache sd_mod usb_storage sg sr_mod cdrom usbhid hid libusual sata_nv pata_amd pata_acpi ohci1394 ata_generic ieee1394 forcedeth libata ehci_hcd ohci_hcd scsi_mod usbcore thermal processor fan fbcon tileblit font bitblit softcursor fuse
[ 35.094616]
[ 35.094618] Pid: 3534, comm: modprobe Not tainted (2.6.24-16-generic #1)
[ 35.094620] EIP: 0060:[<f8a78745>] EFLAGS: 00010246 CPU: 0
[ 35.094634] EIP is at snd_pcm_timer_init+0x25/0x170 [snd_pcm]
[ 35.094636] EAX: 00000001 EBX: df8c1400 ECX: f7539ddc EDX: 00000000
[ 35.094638] ESI: df8c15d4 EDI: f7f62e34 EBP: 00000018 ESP: f7539dc4
[ 35.094640] DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
[ 35.094642] Process modprobe (pid: 3534, ti=f7538000 task=f749a000 task.ti=f7538000)
[ 35.094644] Stack: 00000000 00000001 dfa11e00 00000000 dfa11e00 00000000 00000003 00000000
[ 35.094648] df8c1400 00000018 f8a1f20c 00000000 df8c15d4 f7f62e00 f8a7067f f8a8192c
[ 35.094652] f7f62e00 f7539e18 f74f9e00 00000001 f8a795f4 436d6370 63304431 ffffff00
[ 35.094656] Call Trace:
[ 35.094675] [<f8a1f20c>] snd_add_device_sysfs_file+0x3c/0x70 [snd]
[ 35.094692] [<f8a7067f>] snd_pcm_dev_register+0xef/0x200 [snd_pcm]
[ 35.094724] [<f8a23e4d>] snd_device_register_all+0x2d/0x60 [snd]
[ 35.094738] [<f8a1fa1e>] snd_card_register+0x1e/0x320 [snd]
[ 35.094765] [<f8b0f31a>] alsa_device_init+0x23a/0x280 [saa7134_alsa]
[ 35.094790] [<f8b0f3cb>] saa7134_alsa_init+0x6b/0xc0 [saa7134_alsa]
[ 35.094799] [<c01506b6>] sys_init_module+0x126/0x19c0
[ 35.094879] [<f8a78a80>] snd_pcm_format_width+0x0/0x20 [snd_pcm]
[ 35.094913] [<c01043c2>] sysenter_past_esp+0x6b/0xa9
[ 35.094946] =======================
[ 35.094947] Code: 5b c3 8d 74 26 00 56 89 c6 53 83 ec 30 8b 56 30 c7 44 24 1c 00 00 00 00 8d 4c 24 18 c7 44 24 18 03 00 00 00 8b 18 83 e2 01 8b 03 <8b> 00 89 44 24 20 8b 43 0c 89 44 24 24 8b 46 0c 01 c0 09 c2 8d
[ 35.094964] EIP: [<f8a78745>] snd_pcm_timer_init+0x25/0x170 [snd_pcm] SS:ESP 0068:f7539dc4
[ 35.094976] ---[ end trace 328363d1185b5617 ]---

is there other significant information I can add ?

ld

[ld (ld-dubois)]

this problem appears after hardy migration