Unable to handle kernel NULL pointer dereference at 0000000000000000 RIP:
 [<ffffffff8025ab78>] __drain_pages+0x26/0x60
PGD 6f1f6067 PUD 71789067 PMD 0
Oops: 0000 [1] SMP
CPU 0
Modules linked in: snd_seq snd_pcm_oss snd_mixer_oss nvidia(P) i2c_core ipw3945 snd_hda_intel snd_hda_codec snd_pcm snd_timer snd soundcore snd_page_alloc
Pid: 6790, comm: hal-system-powe Tained: P	2.6.19-gentoo-r5 #26
RIP: 0010:[<ffffffff8025ab78>] [<ffffffff8025ab78>] __drain_pages+0x26/0x60
RSP: 0018:ffff810071a0fdc8 EFLAGS: 00010046
RAX: 0000000000000001 RBX: 0000000000000046 RCX: 0000000000000000
RDX: 0000000000000010 RSI: 0000000000000000 RDI: ffff81000000c400
RBP: 0000000000000000 R08: 0000000000000001 R09: 0000000000000000
R10: ffff81007a8fbc38 R11: ffffffff802ab5f4 R12: ffff81000000c800
R13: 0000000000000000 R14: 0000000000000001 R15: ffff81007c07dec0
FS: 00002b366c94bda0(0000) GS:ffffffff807b4000(0000) knIGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0:000000008005003b
CR2 0000000000000000 CR3: 00000000716b4000 CR4: 00000000000006e0
Process hal-system-powe (pid: 6790, threadinfo ffff810071a0e000, task ffff81006f2a8e60)
Stack: 0000000000000001 0000000000000001 0000000000000007 ffff81007d639510
 0000000000000001 ffffffff8025abc4 ffffffff806bfa10 ffffffff80556aa2
 0000000000000001 0000000000000000 0000000000000001 ffffffff8024a1fc

Call Trace:
 [<ffffffff8025abc4>] page_alloc_cpu_notify+0x12/0x28
 [<ffffffff80556aa2>] notifier_call_chain+0x20/032
 [<ffffffff8024a1fc>] _cpu_down+0x15b/0x271
 [<ffffffff8024a4da>] disable_nonboot_cpus+0xaa/0x13c
 [<ffffffff8024f307>] enter_state+0x8b/0x1a1
 [<ffffffff8024f47d>] state_score+0x60/0x7b
 [<ffffffff802b2878>] sysfs_write_file+0xba/0xee
 [<ffffffff8027ac66>] vfs_write+0x45/0x6e
 [<ffffffff8027b1fc>] sys_write+0x45/0x6e
 [<ffffffff8020957e>] system_call+0x7e/0x83
 [<00002b366c7c4e40>] 

Code: 8b 75 00 4c 89 e7 e8 5b fc ff ff v7 45 00 00 00 00 00 53 9d
RIP [<ffffffff8025ab78>] __drain_pages+0x26/0x60
 RSP <FFFF810071A0FDC8>
CR2: 0000000000000000