NULL pointer dereference in swsusp_arch_suspend

Hi ,
I'm trying add the hibernation to Freescale imx6Q, and I use the patches 
from:
http://lists.infradead.org/pipermail/linux-arm-kernel/2010-December/036055.html
And the TuxOnIce patches:
http://tuxonice.nigelcunningham.com.au/downloads/all/tuxonice-for-linux-3.0-2012-10-23.patch.bz2
The kernel version is 3.0.35. And the SoC have 4 Cores.
When I try to make the hibernation snapshot image, the kernel hint "NULL 
pointer dereference", when enter the "swsusp_arch_suspend" function. 
This function comes from the first patch link.
The function is called in file tuxonice_builtin.c , the code snappit is 
showed below:
int toi_lowlevel_builtin(void){
...
     save_processor_state();
     printk(KERN_ERR "Will Swsusp_arch_suspend\n");
     error = swsusp_arch_suspend();
     printk(KERN_ERR "Done Swsusp_arch_suspend\n");
     if (error)
         printk(KERN_ERR "Error %d hibernating\n", error);
...
}

1. And I have tried to remove the "error = swsusp_arch_suspend()" , and 
this would fix the "NULL pointer dereference", So I can confirm this 
function is the problem. But I can't identify which sentence cause the 
NULL pointer dereference.  Detail log is following.

2. Also the "[ 23.058386] ...20%...40% " in below logs confuse me, it 
seems the cache writing is not complete, it miss the 60% and 80%.

Looking forward to someone would give me a hand.

Detail Logs:
/ # echo >/sys/power/tuxonice/do_hibernate
[ 22.191954] TuxOnIce 3.2, with support for usm, compression, block i/o, 
swap storage, file storage, userui.
[ 22.202953] Initiating a hibernation cycle.
  [ 22.207481] Failed to launch userspace program 
'/usr/local/sbin/tuxoniceui_text': Error -2
[ 22.215774] Launch userspace program failed.
[ 22.220090] Starting other threads.
[ 22.223537] Freezing processes & syncing filesystems.
[ 22.228793] Stopping fuse filesystems.
[ 22.232549] Freezing user space processes ... (elapsed 0.01 seconds) done.
[ 22.782219] Stopping normal filesystems.
[ 22.800634] Freezing remaining freezable tasks ... (elapsed 0.01 
seconds) done.
[ 22.867306] Preparing Image. Try 1.
[ 22.925873] Restarting normal filesystems.
[ 22.957534] Stopping fuse filesystems.
[ 22.961311] Freezing user space processes ... (elapsed 0.00 seconds) done.
[ 22.968803] Stopping normal filesystems.
[ 22.975835] Freezing remaining freezable tasks ... (elapsed 0.01 
seconds) done.
[ 23.049812] Starting to save the image..
[ 23.053750] Writing caches...
[ 23.058386] ...20%...40%
[ 23.061313] ====>> iofinish+iobase=55P,iobarmax=8758P
[ 23.066467] ====>> iofinish+iobase=220KB,iobarmax=35032KB
[ 23.071982] ====>> 
toi_compress_bytes_in=225280B,toi_compress_bytes_out=106086B
[ 23.106327] Waited for i/o due to synchronous I/O 4 times.
[ 23.111848] Doing atomic copy/restore.
[ 23.115602] Enter the Hibernation [imx6_hibernation_begin]
[ 23.122407] udc suspend begins
[ 23.126080] add wake up source irq 51
[ 23.129910] PM: freeze of devices complete after 8.805 msecs
[ 23.136256] PM: late freeze of devices complete after 0.677 msecs
[ 23.142372] Enter the Hibernation [imx6_hibernation_pre_snapshot]
[ 23.148471] Disabling non-boot CPUs ...
[ 23.153364] CPU1: shutdown
[ 23.157274] CPU2: shutdown
[ 23.160823] CPU3: shutdown
[ 23.163908] Will Swsusp_arch_suspend
[ 23.421375] Unable to handle kernel NULL pointer dereference at virtual 
address 00000000
[ 23.429477] pgd = a8b3c000
[ 23.432186] [00000000] *pgd=3816c831, *pte=00000000, *ppte=00000000
[ 23.438500] Internal error: Oops: 80000007 [#1] PREEMPT SMP
[ 23.444076] Modules linked in:
[ 23.447150] CPU: 0 Not tainted (3.0.35 #56)
[ 23.451687] PC is at 0x0
[ 23.454223] LR is at 0x0
[ 23.456759] pc : [<00000000>] lr : [<00000000>] psr: 60000093
[ 23.456764] sp : a8b27e90 ip : 00000002 fp : 00000000
[ 23.468251] r10: 804ee340 r9 : 00000000 r8 : 00000000
[ 23.473479] r7 : 804aa4b0 r6 : 00000000 r5 : 804edd28 r4 : 804ed674
[ 23.480010] r3 : 804e4478 r2 : 804cf814 r1 : 00008000 r0 : 00000000
[ 23.486543] Flags: nZCv IRQs off FIQs on Mode SVC_32 ISA ARM Segment 
kernel
[ 23.493942] Control: 10c53c7d Table: 38b3c04a DAC: 00000015
[ 23.499690]
[ 23.499692] SP: 0xa8b27e10:
[ 23.503972] 7e10 33322020 3336312e 5d383039 00000020 00000000 00000001 
00000000 00025b3e
[ 23.512266] 7e30 00000000 0000040f 00000007 00000000 804aa4b0 80033bb4 
00000000 00008000
[ 23.520558] 7e50 804cf814 804e4478 804ed674 804edd28 00000000 804aa4b0 
00000000 00000000
[ 23.528850] 7e70 804ee340 00000000 00000002 a8b27e90 00000000 00000000 
60000093 ffffffff
[ 23.537141] 7e90 00000001 804ed674 804edd28 00000000 804aa4b0 00000000 
804ee340 800a700c
[ 23.545435] 7eb0 60000093 804ed684 804edd28 8009fd94 000021ff 00000037 
00000004 00000003
[ 23.553726] 7ed0 a8b26000 00000000 804aa000 804ed684 00000000 804ee340 
00000000 800a028c
[ 23.562020] 7ef0 8009e848 804cf9c8 a8bee000 00000001 00000001 00000000 
a825f3f8 804cfa2c