[Bug 612895] Re: Unable to handle kernel NULL pointer dereference at virtual address 00000000
Lee Jones
lee.jones at canonical.com
Tue Aug 3 09:30:23 UTC 2010
Uncompressing Linux... done, booting the kernel.
Linux version 2.6.34-902-omap4 (buildd at satinash) (gcc version 4.4.5 20100720 (prerelease) (Ubuntu 4.4.4-7ubuntu2) ) #6-Ubuntu SMP PREEMP0
CPU: ARMv7 Processor [410fc091] revision 1 (ARMv7), cr=10c53c7f
CPU: VIPT nonaliasing data cache, VIPT nonaliasing instruction cache
Machine: OMAP4430 Panda Board
Memory policy: ECC disabled, Data cache writealloc
OMAP4430 ES1.0
SRAM: Mapped pa 0x40300000 to va 0xfe400000 size: 0x100000
Reserving 33554432 bytes SDRAM for VRAM
PERCPU: Embedded 8 pages/cpu @c3b74000 s9088 r8192 d15488 u65536
pcpu-alloc: s9088 r8192 d15488 u65536 alloc=16*4096
pcpu-alloc: [0] 0 [0] 1
Built 1 zonelists in Zone order, mobility grouping on. Total pages: 117602
Kernel command line: vram=32M mem=463M console=ttyO2,115200n8 console=tty2 root=/dev/mmcblk0p2 fixrtc
PID hash table entries: 2048 (order: 1, 8192 bytes)
Dentry cache hash table entries: 65536 (order: 6, 262144 bytes)
Inode-cache hash table entries: 32768 (order: 5, 131072 bytes)
BUG: Bad page state in process swapper pfn:94126
page:c0a114c0 count:0 mapcount:-897 mapping:(null) index:0x0
page flags: 0x0()
[<c0043684>] (unwind_backtrace+0x0/0xe4) from [<c00ccca8>] (bad_page+0xc4/0xf0)
[<c00ccca8>] (bad_page+0xc4/0xf0) from [<c00cde18>] (__free_pages_ok+0xe4/0x1e8)
[<c00cde18>] (__free_pages_ok+0xe4/0x1e8) from [<c00161c0>] (free_all_bootmem_core+0xf0/0x208)
[<c00161c0>] (free_all_bootmem_core+0xf0/0x208) from [<c000cce0>] (mem_init+0x40/0x310)
[<c000cce0>] (mem_init+0x40/0x310) from [<c000856c>] (mm_init+0x8/0x14)
[<c000856c>] (mm_init+0x8/0x14) from [<c0008a98>] (start_kernel+0xb0/0x258)
[<c0008a98>] (start_kernel+0xb0/0x258) from [<80008080>] (0x80008080)
Disabling lock debugging due to kernel taint
Memory: 463MB = 463MB total
Memory: 423732k/423860k available, 50252k reserved, 0K highmem
Virtual kernel memory layout:
vector : 0xffff0000 - 0xffff1000 ( 4 kB)
fixmap : 0xfff00000 - 0xfffe0000 ( 896 kB)
DMA : 0xffc00000 - 0xffe00000 ( 2 MB)
vmalloc : 0xdd000000 - 0xf8000000 ( 432 MB)
lowmem : 0xc0000000 - 0xdcf00000 ( 463 MB)
modules : 0xbf000000 - 0xc0000000 ( 16 MB)
.init : 0xc0008000 - 0xc003c000 ( 208 kB)
.text : 0xc003c000 - 0xc066b000 (6332 kB)
.data : 0xc06a0000 - 0xc070eb20 ( 443 kB)
SLUB: Genslabs=11, HWalign=32, Order=0-3, MinObjects=0, CPUs=2, Nodes=1
Hierarchical RCU implementation.
NR_IRQS:402
omap_hwmod: l3_main_2: cannot clk_get interface_clk fdif_ck
omap_hwmod: kbd: cannot clk_get main_clk kbd_fck
omap_hwmod: mcpdm: cannot clk_get main_clk mcpdm_fck
GPMC revision 6.0
OMAP clockevent source: GPTIMER1 at 32768 Hz
Console: colour dummy device 80x30
console [tty2] enabled
Calibrating delay loop... 1195.29 BogoMIPS (lpj=4669440)
Security Framework initialized
AppArmor: AppArmor initialized
Mount-cache hash table entries: 512
CPU: Testing write buffer coherency: ok
PL310/L2C-310 cache controller enabled
CPU1: Booted secondary processor
Brought up 2 CPUs
SMP: Total of 2 processors activated (2395.78 BogoMIPS).
devtmpfs: initialized
regulator: core version 0.5
NET: Registered protocol family 16
OMAP GPIO hardware version 0.1
OMAP DMA hardware revision 0.0
bio: create slab <bio-0> at 0
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
i2c_omap i2c_omap.1: bus 1 rev4.0 at 400 kHz
Skipping twl internal clock init and using bootloader value (unknown osc rate)
twl6030: PIH (irq 39) chaining IRQs 368..387
regulator: VMMC: 1200 <--> 3000 mV at 3000 mV normal standby
regulator: VPP: 1800 <--> 2500 mV at 1900 mV normal standby
omap_device: i2c_omap.1: new worst case deactivate latency 0: 30517
regulator: VUSIM: 1200 <--> 2900 mV at 1800 mV normal standby
regulator: VANA: 2100 mV normal standby
regulator: VCXIO: 1800 mV normal standby
regulator: VDAC: 1800 mV normal standby
regulator: VUSB: 3300 mV normal standby
regulator: VAUX1_6030: 1000 <--> 3000 mV at 1800 mV normal standby
regulator: VAUX2_6030: 1200 <--> 2800 mV at 1800 mV normal standby
regulator: VAUX3_6030: 1000 <--> 3000 mV at 1200 mV normal standby
Advanced Linux Sound Architecture Driver Version 1.0.22.1.
NetLabel: Initializing
NetLabel: domain hash size = 128
NetLabel: protocols = UNLABELED CIPSOv4
NetLabel: unlabeled traffic allowed by default
Switching to clocksource 32k_counter
AppArmor: AppArmor Filesystem Enabled
musb_hdrc: version 6.0, pio, host, debug=0
musb_hdrc musb_hdrc: MUSB HDRC host driver
musb_hdrc musb_hdrc: new USB bus registered, assigned bus number 1
usb usb1: New USB device found, idVendor=1d6b, idProduct=0002
usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
usb usb1: Product: MUSB HDRC host driver
usb usb1: Manufacturer: Linux 2.6.34-902-omap4 musb-hcd
usb usb1: SerialNumber: musb_hdrc
hub 1-0:1.0: USB hub found
hub 1-0:1.0: 1 port detected
musb_hdrc musb_hdrc: USB Host mode controller at fc0ab000 using PIO, IRQ 124
NET: Registered protocol family 2
IP route cache hash table entries: 4096 (order: 2, 16384 bytes)
TCP established hash table entries: 16384 (order: 5, 131072 bytes)
TCP bind hash table entries: 16384 (order: 5, 196608 bytes)
TCP: Hash tables configured (established 16384 bind 16384)
TCP reno registered
UDP hash table entries: 256 (order: 1, 8192 bytes)
UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
NET: Registered protocol family 1
RPC: Registered udp transport module.
RPC: Registered tcp transport module.
RPC: Registered tcp NFSv4.1 backchannel transport module.
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 5564K
omap4_syslink_init: Successfully registered devices
sdp4430_wifi_init: start
omap-iommu omap-iommu.0: ducati registered
audit: initializing netlink socket (disabled)
type=2000 audit(5.717:1): initialized
usb 1-1: new high speed USB device using musb_hdrc and address 2
VFS: Disk quotas dquot_6.5.2
Dquot-cache hash table entries: 1024 (order 0, 4096 bytes)
msgmni has been set to 838
alg: No test for stdrng (krng)
io scheduler noop registered
io scheduler deadline registered
io scheduler cfq registered (default)
OMAP DSS rev 4.0
OMAP DISPC rev 4.0
OMAP DSI rev 3.0
OMAP DSI2 rev 3.0
OMAP HDMI W1 rev 1.0
usb 1-1: New USB device found, idVendor=0424, idProduct=9514
usb 1-1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
hub 1-1:1.0: USB hub found
hub 1-1:1.0: 5 ports detected
omap-hsuart.0: ttyO0 at MMIO 0x4806a000 (irq = 104) is a OMAP UART0
omap-hsuart.1: ttyO1 at MMIO 0x4806c000 (irq = 105) is a OMAP UART1
omap-hsuart.2: ttyO2 at MMIO 0x48020000 (irq = 106) is a OMAP UART2
usb 1-1.1: new high speed USB device using musb_hdrc and address 3
usb 1-1.1: New USB device found, idVendor=0424, idProduct=ec00
usb 1-1.1: New USB device strings: Mfr=0, Product=0, SerialNumber=0
usb 1-1.2: new low speed USB device using musb_hdrc and address 4
usb 1-1.2: New USB device found, idVendor=04f2, idProduct=0402
usb 1-1.2: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1.2: Product: USB Keyboard
usb 1-1.2: Manufacturer: Chicony
usb 1-1.3: new low speed USB device using musb_hdrc and address 5
usb 1-1.3: New USB device found, idVendor=046d, idProduct=c058
usb 1-1.3: New USB device strings: Mfr=1, Product=2, SerialNumber=0
usb 1-1.3: Product: USB Optical Mouse
usb 1-1.3: Manufacturer: Logitech
console [ttyO2] enabled
omap-hsuart.3: ttyO3 at MMIO 0x4806e000 (irq = 102) is a OMAP UART3
brd: module loaded
loop: module loaded
smsc95xx v1.0.4
smsc95xx 1-1.1:1.0: usb0: register 'smsc95xx' at usb-musb_hdrc-1.1, smsc95xx USB 2.0 Ethernet, e6:48:71:af:f3:6e
usbcore: registered new interface driver smsc95xx
Initializing USB Mass Storage driver...
usbcore: registered new interface driver usb-storage
USB Mass Storage support registered.
udc: OMAP UDC driver, version: 4 October 2004 (iso) (dma)
mice: PS/2 mouse device common for all mice
twl_rtc twl_rtc: rtc core: registered twl_rtc as rtc0
i2c /dev entries driver
Linux video capture interface: v2.00
Driver for 1-wire Dallas network protocol.
1-Wire driver for the DS2760 battery monitor chip - (c) 2004-2005, Szabolcs Gyurko
i2c i2c-1: SMBus Quick command not supported, can't probe for chips
OMAP Watchdog Timer Rev 0x00: initial timeout 60 sec
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
usbcore: registered new interface driver hiddev
input: Chicony USB Keyboard as /devices/platform/musb_hdrc/usb1/1-1/1-1.2/1-1.2:1.0/input/input0
generic-usb 0003:04F2:0402.0001: input,hidraw0: USB HID v1.11 Keyboard [Chicony USB Keyboard] on usb-musb_hdrc-1.2/input0
input: Chicony USB Keyboard as /devices/platform/musb_hdrc/usb1/1-1/1-1.2/1-1.2:1.1/input/input1
generic-usb 0003:04F2:0402.0002: input,hiddev96,hidraw1: USB HID v1.11 Device [Chicony USB Keyboard] on usb-musb_hdrc-1.2/input1
input: Logitech USB Optical Mouse as /devices/platform/musb_hdrc/usb1/1-1/1-1.3/1-1.3:1.0/input/input2
generic-usb 0003:046D:C058.0003: input,hidraw2: USB HID v1.11 Mouse [Logitech USB Optical Mouse] on usb-musb_hdrc-1.3/input0
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
proc4430_drv_initializeModule
Could not look up aess hw_mod
No device for DAI Multimedia
No device for DAI Tones DL
No device for DAI Voice
No device for DAI Digital Uplink
No device for DAI Vibrator
No device for DAI omap-mcbsp-dai-0
No device for DAI omap-mcbsp-dai-1
No device for DAI omap-mcbsp-dai-2
No device for DAI omap-mcbsp-dai-3
No device for DAI omap-abe-mm
No device for DAI omap-abe-tone-dl
No device for DAI omap-abe-voice
No device for DAI omap-abe-dig-ul
No device for DAI omap-abe-vib
OMAP HDMI W1 rev 1.0
No device for DAI omap-hdmi-dai
SDP4430 SoC init
No device for DAI null
asoc: Multimedia <-> omap-abe-mm mapping ok
asoc: Tones DL <-> omap-abe-tone-dl mapping ok
asoc: Voice <-> omap-abe-voice mapping ok
asoc: Digital Uplink <-> omap-abe-dig-ul mapping ok
asoc: Vibrator <-> omap-abe-vib mapping ok
asoc: null <-> omap-hdmi-dai mapping ok
input: SDP4430 Headset Jack as /devices/platform/soc-audio/sound/card0/input3
ASoC: Failed to create Aux/FM Stereo In debugfs file
ALSA device list:
#0: SDP4430 (twl6040)
mmc0: host does not support reading read-only switch. assuming write-enable.
mmc0: new high speed SDHC card at address a32e
aufs 2-standalone.tree-33-20100329
oprofile: using timer interrupt.
TCP cubic registered
NET: Registered protocol family 10
lo: Disabled Privacy Extensions
NET: Registered protocol family 17
Enabling AXI2OCP errata Fix
VFP support v0.3: implementor 41 architecture 3 part 30 variant 9 rev 0
mmcblk0: mmc0:a32e SD16G 14.9 GiB
registered taskstats version 1
mmcblk0: p1 p2
Console: switching to colour frame buffer device 240x67
EDID TIMING DATA FOUND
regulator_init_complete: incomplete constraints, leaving VAUX3_6030 on
regulator_init_complete: incomplete constraints, leaving VAUX2_6030 on
regulator_init_complete: incomplete constraints, leaving VUSB on
regulator_init_complete: incomplete constraints, leaving VDAC on
regulator_init_complete: incomplete constraints, leaving VCXIO on
regulator_init_complete: incomplete constraints, leaving VANA on
regulator_init_complete: incomplete constraints, leaving VUSIM on
regulator_init_complete: incomplete constraints, leaving VPP on
twl_rtc twl_rtc: setting system clock to 2000-01-01 00:20:26 UTC (946686026)
omap_vout omap_vout: : registered and initialized video device 0
omap_vout omap_vout: : registered and initialized video device 1
omap_wb: registered and initialized wb device 2 [v4l2]
Display disabled
Freeing init memory: 208K
Display disabled
udev: starting version 151
EDID TIMING DATA supported NOT FOUND
EDID TIMING DATA supported NOT FOUND
kernel BUG at /build/buildd/linux-ti-omap4-2.6.34/drivers/video/omap2/dss/dispc.c:1657!
Unable to handle kernel NULL pointer dereference at virtual address 00000000
pgd = dcb28000
[00000000] *pgd=9cbcf031, *pte=00000000, *ppte=00000000
Internal error: Oops: 817 [#1] PREEMPT SMP
last sysfs file: /sys/kernel/uevent_seqnum
Modules linked in:
CPU: 0 Tainted: G B (2.6.34-902-omap4 #6-Ubuntu)
PC is at __bug+0x1c/0x28
LR is at __bug+0x18/0x28
pc : [<c0040408>] lr : [<c0040404>] psr: 20000113
sp : dcbffde8 ip : df894220 fp : 00000000
r10: 00000000 r9 : 00000000 r8 : 00000000
r7 : 00000085 r6 : dcbffe08 r5 : 00000000 r4 : c06bd028
r3 : 00000000 r2 : dcbffddc r1 : c05d65dc r0 : 0000005e
Flags: nzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment user
Control: 10c53c7d Table: 9cb2804a DAC: 00000015
Process init (pid: 159, stack limit = 0xdcbfe2f0)
Stack: (0xdcbffde8 to 0xdcc00000)
fde0: df0a8000 c02b0098 c06bd028 c02bf890 00002030 00003720
fe00: 00002020 00000a30 00000000 ffffffff 00000000 c04db9e4 31f8000f 0020cccc
fe20: 0001d2f2 0001007b c06bd028 00000001 c06a63bc c02bfe04 00000085 00000002
fe40: 00000000 da425740 dcbfe000 c00ab6c0 c06a6380 00000085 c06a63bc da425740
fe60: 00000000 dcbfe000 beb4c274 c00ad834 00000085 00000000 c003a984 dcbffea0
fe80: 00000000 c003c07c 60000113 ffffffff fa240100 00000085 00000001 c04de988
fea0: beb4c274 00000000 00000000 00000000 dcbfffb0 0000081f dcb31ba0 dcb3b9c0
fec0: dcb31bd4 400180f0 beb4c274 00000000 00000000 dcbffee8 c003c378 c04e0990
fee0: 60000113 ffffffff beb4c274 0000081f 0000081f c06b1444 beb4c274 dcbfffb0
ff00: 00000000 400180f0 40104000 c003c378 c06b0218 c04e0d5c 00000000 00000002
ff20: c06a0000 c04dee14 22af3d82 dcb38288 00000000 dcbfe000 00000011 c0075960
ff40: 22c166ab ffffffff dcbfff8c 00000000 00000000 c04de92c 40018158 c06bfbf0
ff60: 0000009f dcb3b9c0 dcbfe000 dcb38420 00000000 00000000 00000000 00000000
ff80: 00000000 dcbfffac d964e044 dcbfffa0 c006cb2c c028309c 40000013 ffffffff
ffa0: beb4c290 00000001 beb4c2a0 c04dede0 00001210 4001e050 4006f350 00094cb0
ffc0: 40018158 beb4c290 00000001 beb4c2a0 00000000 400180f0 40104000 00000000
ffe0: 00000078 beb4c290 4008e1d9 4006f34e 00000030 ffffffff 00000fff 00001000
[<c0040408>] (__bug+0x1c/0x28) from [<c02b0098>] (dispc_set_digit_size+0x1c/0x68)
[<c02b0098>] (dispc_set_digit_size+0x1c/0x68) from [<c02bf890>] (hdmi_power_on+0x150/0x188)
[<c02bf890>] (hdmi_power_on+0x150/0x188) from [<c02bfe04>] (hdmi_irq_handler+0x90/0x12c)
[<c02bfe04>] (hdmi_irq_handler+0x90/0x12c) from [<c00ab6c0>] (handle_IRQ_event+0xa0/0x190)
[<c00ab6c0>] (handle_IRQ_event+0xa0/0x190) from [<c00ad834>] (handle_level_irq+0xb0/0x12c)
[<c00ad834>] (handle_level_irq+0xb0/0x12c) from [<c003c07c>] (asm_do_IRQ+0x7c/0xac)
[<c003c07c>] (asm_do_IRQ+0x7c/0xac) from [<c04de988>] (__irq_svc+0x48/0xbc)
Exception stack(0xdcbffea0 to 0xdcbffee8)
fea0: beb4c274 00000000 00000000 00000000 dcbfffb0 0000081f dcb31ba0 dcb3b9c0
fec0: dcb31bd4 400180f0 beb4c274 00000000 00000000 dcbffee8 c003c378 c04e0990
fee0: 60000113 ffffffff
[<c04de988>] (__irq_svc+0x48/0xbc) from [<c04e0990>] (do_page_fault+0xd0/0x1c4)
[<c04e0990>] (do_page_fault+0xd0/0x1c4) from [<c003c378>] (do_DataAbort+0x34/0x98)
[<c003c378>] (do_DataAbort+0x34/0x98) from [<c04dede0>] (ret_from_exception+0x0/0x10)
Exception stack(0xdcbfffb0 to 0xdcbffff8)
ffa0: 00001210 4001e050 4006f350 00094cb0
ffc0: 40018158 beb4c290 00000001 beb4c2a0 00000000 400180f0 40104000 00000000
ffe0: 00000078 beb4c290 4008e1d9 4006f34e 00000030 ffffffff
Code: e59f0010 e1a01003 eb126d71 e3a03000 (e5833000)
---[ end trace 7fb6b32c16c3d45e ]---
Kernel panic - not syncing: Fatal exception in interrupt
[<c0043684>] (unwind_backtrace+0x0/0xe4) from [<c04db944>] (panic+0x44/0xcc)
[<c04db944>] (panic+0x44/0xcc) from [<c0040a7c>] (die+0xd4/0xfc)
[<c0040a7c>] (die+0xd4/0xfc) from [<c00446e8>] (__do_kernel_fault+0x64/0x84)
[<c00446e8>] (__do_kernel_fault+0x64/0x84) from [<c04e0a68>] (do_page_fault+0x1a8/0x1c4)
[<c04e0a68>] (do_page_fault+0x1a8/0x1c4) from [<c003c378>] (do_DataAbort+0x34/0x98)
[<c003c378>] (do_DataAbort+0x34/0x98) from [<c04de92c>] (__dabt_svc+0x4c/0x60)
Exception stack(0xdcbffda0 to 0xdcbffde8)
fda0: 0000005e c05d65dc dcbffddc 00000000 c06bd028 00000000 dcbffe08 00000085
fdc0: 00000000 00000000 00000000 00000000 df894220 dcbffde8 c0040404 c0040408
fde0: 20000113 ffffffff
[<c04de92c>] (__dabt_svc+0x4c/0x60) from [<c0040408>] (__bug+0x1c/0x28)
[<c0040408>] (__bug+0x1c/0x28) from [<c02b0098>] (dispc_set_digit_size+0x1c/0x68)
[<c02b0098>] (dispc_set_digit_size+0x1c/0x68) from [<c02bf890>] (hdmi_power_on+0x150/0x188)
[<c02bf890>] (hdmi_power_on+0x150/0x188) from [<c02bfe04>] (hdmi_irq_handler+0x90/0x12c)
[<c02bfe04>] (hdmi_irq_handler+0x90/0x12c) from [<c00ab6c0>] (handle_IRQ_event+0xa0/0x190)
[<c00ab6c0>] (handle_IRQ_event+0xa0/0x190) from [<c00ad834>] (handle_level_irq+0xb0/0x12c)
[<c00ad834>] (handle_level_irq+0xb0/0x12c) from [<c003c07c>] (asm_do_IRQ+0x7c/0xac)
[<c003c07c>] (asm_do_IRQ+0x7c/0xac) from [<c04de988>] (__irq_svc+0x48/0xbc)
Exception stack(0xdcbffea0 to 0xdcbffee8)
fea0: beb4c274 00000000 00000000 00000000 dcbfffb0 0000081f dcb31ba0 dcb3b9c0
fec0: dcb31bd4 400180f0 beb4c274 00000000 00000000 dcbffee8 c003c378 c04e0990
fee0: 60000113 ffffffff
[<c04de988>] (__irq_svc+0x48/0xbc) from [<c04e0990>] (do_page_fault+0xd0/0x1c4)
[<c04e0990>] (do_page_fault+0xd0/0x1c4) from [<c003c378>] (do_DataAbort+0x34/0x98)
[<c003c378>] (do_DataAbort+0x34/0x98) from [<c04dede0>] (ret_from_exception+0x0/0x10)
Exception stack(0xdcbfffb0 to 0xdcbffff8)
ffa0: 00001210 4001e050 4006f350 00094cb0
ffc0: 40018158 beb4c290 00000001 beb4c2a0 00000000 400180f0 40104000 00000000
ffe0: 00000078 beb4c290 4008e1d9 4006f34e 00000030 ffffffff
CPU1: stopping
[<c0043684>] (unwind_backtrace+0x0/0xe4) from [<c004204c>] (ipi_cpu_stop+0x20/0x48)
[<c004204c>] (ipi_cpu_stop+0x20/0x48) from [<c003c268>] (do_IPI+0xc0/0x104)
[<c003c268>] (do_IPI+0xc0/0x104) from [<c04de988>] (__irq_svc+0x48/0xbc)
Exception stack(0xdc857fa0 to 0xdc857fe8)
7fa0: 00000001 dcb39ce0 dc857fe8 00000000 dc856000 00000015 10c03c7d c070ef28
7fc0: 00000000 410fc091 00000000 00000000 dcb36044 dc857fe8 c003dc78 c003dc7c
7fe0: 60000013 ffffffff
[<c04de988>] (__irq_svc+0x48/0xbc) from [<c003dc7c>] (default_idle+0x24/0x28)
[<c003dc7c>] (default_idle+0x24/0x28) from [<c003e168>] (cpu_idle+0x74/0xc4)
[<c003e168>] (cpu_idle+0x74/0xc4) from [<80008080>] (0x80008080)
--
Unable to handle kernel NULL pointer dereference at virtual address 00000000
https://bugs.launchpad.net/bugs/612895
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