BUG: unable to handle kernel NULL pointer dereference at 0000000000000010
IP: [<ffffffff81294536>] cfq_rb_erase+0x16/0x60
PGD 11d3ef067 PUD 109140067 PMD 0 
Oops: 0000 [#1] SMP 
last sysfs file: /sys/devices/system/cpu/cpu3/cache/index2/shared_cpu_map
CPU 2 
Modules linked in: nfs lockd nfs_acl auth_rpcgss sunrpc autofs4 snd_hda_codec_realtek fbcon tileblit font bitblit softcursor snd_hda_intel snd_hda_codec snd_hwdep nouveau ttm drm_kms_helper snd_pcm snd_timer snd drm amd64_edac_mod soundcore edac_core snd_page_alloc i2c_nforce2 i2c_algo_bit psmouse k8temp ppdev edac_mce_amd serio_raw parport_pc shpchp lp parport raid10 raid456 async_pq async_xor xor async_memcpy async_raid6_recov raid6_pq async_tx raid1 raid0 multipath myri10ge ohci1394 tg3 dca linear pata_amd ieee1394 sata_nv

Pid: 5989, comm: concurrent-read Not tainted 2.6.35-rc3-custom #2 KFN32-D SLI/KFN32-D SLI
RIP: 0010:[<ffffffff81294536>]  [<ffffffff81294536>] cfq_rb_erase+0x16/0x60
RSP: 0018:ffff8800066b17a8  EFLAGS: 00010082
RAX: 0000000000000001 RBX: ffff88011cb41e11 RCX: ffff88011cb41e20
RDX: ffff88011cb41e21 RSI: 0000000000000000 RDI: ffff88011cb41e21
RBP: ffff8800066b17b8 R08: 0000000000000004 R09: 0000000000000000
R10: 5600000000000000 R11: 0000000000000000 R12: ffff880007fd70d0
R13: 0000000000000000 R14: ffff880007fd7000 R15: 00000000ffffb527
FS:  00007fd1a97ea710(0000) GS:ffff880080200000(0000) knlGS:00000000083c1830
CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 0000000000000010 CR3: 000000011c89e000 CR4: 00000000000006e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Process concurrent-read (pid: 5989, threadinfo ffff8800066b0000, task ffff88007f4d8000)
Stack:
 ffff88011cb41e11 ffff880007fd70d0 ffff8800066b1818 ffffffff812959c1
<0> 0000000000000001 ffff880007fd8928 0000000000000000 ffff88011cb41e21
<0> ffff8801092f8668 ffff88011cb41e11 ffff880007fd7000 ffff88011cb41e11
Call Trace:
 [<ffffffff812959c1>] cfq_service_tree_add+0xe1/0x390
 [<ffffffff81295c99>] cfq_resort_rr_list+0x29/0x40
 [<ffffffff8129710b>] cfq_add_rq_rb+0x8b/0xf0
 [<ffffffff8129727a>] cfq_insert_request+0x9a/0x500
 [<ffffffff81281e28>] elv_insert+0x118/0x200
 [<ffffffff81281f7a>] __elv_add_request+0x6a/0xc0
 [<ffffffff81287cfa>] __make_request+0x12a/0x4b0
 [<ffffffff812865ef>] generic_make_request+0x1af/0x530
 [<ffffffff810f0d85>] ? mempool_alloc_slab+0x15/0x20
 [<ffffffff8112f55d>] ? kmem_cache_alloc+0xed/0x150
 [<ffffffff811664e2>] ? alloc_buffer_head+0x22/0x60
 [<ffffffff812869ec>] submit_bio+0x7c/0x100
 [<ffffffff81166a39>] submit_bh+0xf9/0x140
 [<ffffffff81169104>] block_read_full_page+0x274/0x3b0
 [<ffffffff8116cf20>] ? blkdev_get_block+0x0/0x70
 [<ffffffff81105825>] ? __inc_zone_page_state+0x35/0x40
 [<ffffffff810eee48>] ? add_to_page_cache_locked+0xe8/0x160
 [<ffffffff8116e1c8>] blkdev_readpage+0x18/0x20
 [<ffffffff810f8632>] __do_page_cache_readahead+0x172/0x210
 [<ffffffff810f86f1>] ra_submit+0x21/0x30
 [<ffffffff810f8aa5>] ondemand_readahead+0x115/0x240
 [<ffffffff810f8c60>] page_cache_async_readahead+0x90/0xd0
 [<ffffffff810efce4>] generic_file_aio_read+0x4e4/0x730
 [<ffffffff8124a16f>] ? security_inode_permission+0x1f/0x30
 [<ffffffff8113dd0a>] do_sync_read+0xda/0x120
 [<ffffffff810548d8>] ? pick_next_task_fair+0xf8/0x130
 [<ffffffff81033ca9>] ? default_spin_lock_flags+0x9/0x10
 [<ffffffff81249256>] ? security_file_permission+0x16/0x20
 [<ffffffff8113e585>] vfs_read+0xb5/0x1a0
 [<ffffffff8113e892>] sys_pread64+0x82/0xa0
 [<ffffffff8100a072>] system_call_fastpath+0x16/0x1b
Code: 24 d4 01 00 00 31 c0 e8 49 6a e4 ff e9 7a ff ff ff 0f 1f 40 00 55 48 89 e5 48 83 ec 10 48 89 1c 24 4c 89 64 24 08 0f 1f 44 00 00 <48> 39 7e 10 48 89 fb 49 89 f4 74 2e 4c 89 e6 48 89 df e8 d3 be 
RIP  [<ffffffff81294536>] cfq_rb_erase+0x16/0x60
 RSP <ffff8800066b17a8>
CR2: 0000000000000010
---[ end trace 429b580edca4f6a8 ]---