*** This bug is a duplicate of bug 76294 ***

Happens as well in 2.6.20-[45]-{generic,lowlatency}.

This bug doesn't seem to crash the system for me; it just spews messy
bugs into dmesg and makes Xorg not want to load (I'm using the Via
driver).  I removed linux-restricted-modules for the kernel I'm using to
get rid of the driver after trying to reboot like 10 times.

My syslog segment for this is below.

Jan 14 12:49:20 localhost kernel: [   58.364501] ath_rate_sample: 1.2 (0.9.2.1)
Jan 14 12:49:20 localhost kernel: [   58.382930] ath_pci: 0.9.4.5 (0.9.2.1)
Jan 14 12:49:20 localhost kernel: [   58.382992] ACPI: PCI Interrupt 
0000:00:0b.0[A] -> GSI 19 (level, low) -> IRQ 19
Jan 14 12:49:20 localhost kernel: [   58.383036] wifi%%d: unable to attach 
hardware: '' (HAL status 4172484335)
Jan 14 12:49:20 localhost kernel: [   58.383056] ACPI: PCI interrupt for device 
0000:00:0b.0 disabled
Jan 14 12:49:20 localhost kernel: [   58.434478] sr0: scsi3-mmc drive: 1x/48x 
writer cd/rw xa/form2 cdda tray
Jan 14 12:49:20 localhost kernel: [   58.434486] Uniform CD-ROM driver 
Revision: 3.20
Jan 14 12:49:20 localhost kernel: [   58.435892] sr 3:0:0:0: Attached scsi 
CD-ROM sr0
Jan 14 12:49:20 localhost kernel: [   58.694974] ACPI: PCI Interrupt 
0000:00:09.0[A] -> GSI 17 (level, low) -> IRQ 20
Jan 14 12:49:20 localhost kernel: [   58.861941] ACPI: PCI Interrupt Link 
[ALKC] BIOS reported IRQ 0, using IRQ 22
Jan 14 12:49:20 localhost kernel: [   58.861948] ACPI: PCI Interrupt Link 
[ALKC] enabled at IRQ 22
Jan 14 12:49:20 localhost kernel: [   58.861957] ACPI: PCI Interrupt 
0000:00:11.5[C] -> Link [ALKC] -> GSI 22 (level, low) -> IRQ 21
Jan 14 12:49:20 localhost kernel: [   58.862103] BUG: unable to handle kernel 
NULL pointer dereference at virtual address 00000025
Jan 14 12:49:20 localhost kernel: [   58.862106]  printing eip:
Jan 14 12:49:20 localhost kernel: [   58.862108] c01fa52f
Jan 14 12:49:20 localhost kernel: [   58.862109] *pde = 00000000
Jan 14 12:49:20 localhost kernel: [   58.862113] Oops: 0000 [#1]
Jan 14 12:49:20 localhost kernel: [   58.862114] PREEMPT SMP 
Jan 14 12:49:20 localhost kernel: [   58.862117] Modules linked in: snd_via82xx 
gameport snd_mpu401_uart snd_seq_dummy snd_seq_oss snd_emu10k1 snd_ac97_codec 
ac97_bus snd_pcm_oss snd_mixer_oss snd_seq_midi snd_rawmidi snd_seq_midi_event 
snd_seq snd_pcm snd_seq_device snd_timer snd_page_alloc snd_util_mem sr_mod 
cdrom k8temp ath_pci ath_rate_sample snd_hwdep amd64_agp snd psmouse i2c_viapro 
serio_raw i2c_core wlan shpchp pci_hotplug pcspkr 8139cp soundcore agpgart 
generic ath_hal(P) evdev ipv6 ata_generic ext3 jbd mbcache sg sd_mod 8139too 
mii ehci_hcd uhci_hcd usbcore pata_via sata_via libata scsi_mod ohci1394 
ieee1394 raid10 raid456 xor raid1 raid0 multipath linear md_mod thermal 
processor fan fbcon tileblit font bitblit softcursor vesafb capability commoncap
Jan 14 12:49:20 localhost kernel: [   58.862168] CPU:    0
Jan 14 12:49:20 localhost kernel: [   58.862169] EIP:    
0060:[pci_get_subsys+79/240]    Tainted: P      VLI
Jan 14 12:49:20 localhost kernel: [   58.862170] EFLAGS: 00010213   
(2.6.20-4-lowlatency #2)
Jan 14 12:49:20 localhost kernel: [   58.862179] EIP is at 
pci_get_subsys+0x4f/0xf0
Jan 14 12:49:20 localhost kernel: [   58.862182] eax: 0000168c   ebx: 00001106  
 ecx: 00000001   edx: 00000001
Jan 14 12:49:20 localhost kernel: [   58.862186] esi: 00003068   edi: ffffffff  
 ebp: 00000000   esp: f7d91d40
Jan 14 12:49:20 localhost kernel: [   58.862188] ds: 007b   es: 007b   ss: 0068
Jan 14 12:49:20 localhost kernel: [   58.862191] Process modprobe (pid: 5578, 
ti=f7d90000 task=f7c47570 task.ti=f7d90000)
Jan 14 12:49:20 localhost kernel: [   58.862194] Stack: 00000213 c02ec665 
c01f49c3 00000001 fffbf940 f4c89400 f7d91d83 f4c89400 
Jan 14 12:49:20 localhost kernel: [   58.862201]        c01fa5e8 ffffffff 
00000000 f8cac3c2 f7d91d83 00000080 f8cad100 c0152543 
Jan 14 12:49:20 localhost kernel: [   58.862207]        01586480 00000000 
00000000 df832000 f4c89400 f8cad58b f69d7e14 f4c89400 
Jan 14 12:49:20 localhost kernel: [   58.862213] Call Trace:
Jan 14 12:49:20 localhost kernel: [   58.862220]  
[_spin_unlock_irqrestore+21/48] _spin_unlock_irqrestore+0x15/0x30
Jan 14 12:49:20 localhost kernel: [   58.862226]  
[pci_bus_read_config_byte+99/128] pci_bus_read_config_byte+0x63/0x80
Jan 14 12:49:20 localhost kernel: [   58.862243]  [pci_get_device+24/32] 
pci_get_device+0x18/0x20
Jan 14 12:49:20 localhost kernel: [   58.862253]  [pg0+948106178/1069028352] 
snd_via82xx_chip_init+0xe2/0x250 [snd_via82xx]
Jan 14 12:49:20 localhost kernel: [   58.862266]  [pg0+948109568/1069028352] 
snd_via8233_interrupt+0x0/0xf0 [snd_via82xx]
Jan 14 12:49:20 localhost kernel: [   58.862272]  [request_irq+163/192] 
request_irq+0xa3/0xc0
Jan 14 12:49:20 localhost kernel: [   58.862291]  [pg0+948110731/1069028352] 
snd_via82xx_probe+0x24b/0x1030 [snd_via82xx]
Jan 14 12:49:20 localhost kernel: [   58.862349]  [sysfs_make_dirent+28/144] 
sysfs_make_dirent+0x1c/0x90
Jan 14 12:49:20 localhost kernel: [   58.862357]  [sysfs_dirent_exist+69/112] 
sysfs_dirent_exist+0x45/0x70
Jan 14 12:49:20 localhost kernel: [   58.862374]  [sysfs_create_link+110/352] 
sysfs_create_link+0x6e/0x160
Jan 14 12:49:20 localhost kernel: [   58.862386]  [_spin_unlock+17/48] 
_spin_unlock+0x11/0x30
Jan 14 12:49:20 localhost kernel: [   58.862390]  [store_new_id+146/384] 
store_new_id+0x92/0x180
Jan 14 12:49:20 localhost kernel: [   58.862397]  [pg0+948110144/1069028352] 
snd_via82xx_probe+0x0/0x1030 [snd_via82xx]
Jan 14 12:49:20 localhost kernel: [   58.862411]  [pci_device_probe+86/128] 
pci_device_probe+0x56/0x80
Jan 14 12:49:20 localhost kernel: [   58.862424]  [really_probe+84/320] 
really_probe+0x54/0x140
Jan 14 12:49:20 localhost kernel: [   58.862433]  [driver_probe_device+73/192] 
driver_probe_device+0x49/0xc0
Jan 14 12:49:20 localhost kernel: [   58.862437]  [_spin_unlock+17/48] 
_spin_unlock+0x11/0x30
Jan 14 12:49:20 localhost kernel: [   58.862441]  [klist_next+93/160] 
klist_next+0x5d/0xa0
Jan 14 12:49:20 localhost kernel: [   58.862458]  [__driver_attach+128/144] 
__driver_attach+0x80/0x90
Jan 14 12:49:20 localhost kernel: [   58.862466]  [bus_for_each_dev+59/96] 
bus_for_each_dev+0x3b/0x60
Jan 14 12:49:20 localhost kernel: [   58.862490]  [driver_attach+22/32] 
driver_attach+0x16/0x20
Jan 14 12:49:20 localhost kernel: [   58.862494]  [__driver_attach+0/144] 
__driver_attach+0x0/0x90
Jan 14 12:49:20 localhost kernel: [   58.862498]  [bus_add_driver+123/416] 
bus_add_driver+0x7b/0x1a0
Jan 14 12:49:20 localhost kernel: [   58.862525]  
[__pci_register_driver+126/192] __pci_register_driver+0x7e/0xc0
Jan 14 12:49:20 localhost kernel: [   58.862537]  [sys_init_module+349/7152] 
sys_init_module+0x15d/0x1bf0
Jan 14 12:49:20 localhost kernel: [   58.862678]  [sys_mmap2+205/208] 
sys_mmap2+0xcd/0xd0
Jan 14 12:49:20 localhost kernel: [   58.862705]  [sysenter_past_esp+95/137] 
sysenter_past_esp+0x5f/0x89
Jan 14 12:49:20 localhost kernel: [   58.862757]  =======================
Jan 14 12:49:20 localhost kernel: [   58.862759] Code: 00 b8 e4 7e 3a c0 e8 d1 
20 f4 ff 85 ed 0f 84 7b 00 00 00 8b 55 00 85 d2 74 1f 66 90 81 fa a8 7a 3a c0 
74 15 83 fb ff 89 d1 74 34 <0f> b7 42 24 39 c3 74 2c 8b 12 85 d2 75 e3 31 c9 89 
c8 e8 ba f6 
Jan 14 12:49:20 localhost kernel: [   58.862788] EIP: [pci_get_subsys+79/240] 
pci_get_subsys+0x4f/0xf0 SS:ESP 0068:f7d91d40

-- 
feisty kernel ath_pci module: BUG: unable to handle kernel NULL pointer 
dereference at virtual address 00000000
https://launchpad.net/bugs/78015

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