BUG: unable to handle kernel 
 NULL pointer dereference
  at (null) 
 IP:
  [<ffffffff82161537>] cfq_yield+0x5f/0x135 
 PGD 1342ff067 
 PUD 1342ee067 
 PMD 0 
  
 Oops: 0002 [#1] 
 SMP 
  
 last sysfs file: /sys/devices/pci0000:00/0000:00:1e.0/0000:04:02.0/irq 
 CPU 0 
  
 Modules linked in:
  ocfs2
  jbd2
  ocfs2_nodemanager
  configfs
  ocfs2_stackglue
  netconsole
  autofs4
  hidp
  rfcomm
  l2cap
  crc16
  bluetooth
  rfkill
  sunrpc
  ib_iser
  rdma_cm
  ib_cm
  iw_cm
  ib_sa
  ib_mad
  ib_core
  ib_addr
  ipv6
  iscsi_tcp
  libiscsi_tcp
  libiscsi
  scsi_transport_iscsi
  dm_mirror
  dm_region_hash
  dm_log
  dm_multipath
  dm_mod
  video
  output
  sbs
  sbshc
  battery
  acpi_memhotplug
  ac
  lp
  sg
  dcdbas
  sr_mod
  cdrom
  option
  usb_wwan
  usbserial
  serio_raw
  parport_pc
  parport
  rtc_cmos
  rtc_core
  rtc_lib
  snd_hda_codec_analog
  tpm_tis
  tpm
  tpm_bios
  button
  snd_hda_intel
  snd_hda_codec
  snd_seq_dummy
  tg3
  snd_seq_oss
  snd_seq_midi_event
  snd_seq
  e1000
  snd_seq_device
  libphy
  snd_pcm_oss
  snd_mixer_oss
  i2c_i801
  i2c_core
  snd_pcm
  snd_timer
  snd
  soundcore
  snd_page_alloc
  shpchp
  pcspkr
  ata_piix
  libata
  sd_mod
  scsi_mod
  ext3
  jbd
  ehci_hcd
  ohci_hcd
  uhci_hcd
  [last unloaded: microcode]
  
  
 Pid: 4130, comm: ocfs2_wq Not tainted 2.6.35-rc3+ #5 0MM599/OptiPlex 745                  
 RIP: 0010:[<ffffffff82161537>] 
  [<ffffffff82161537>] cfq_yield+0x5f/0x135 
 RSP: 0018:ffff880123061c60  EFLAGS: 00010246 
 RAX: 0000000000000000 RBX: ffff88012c2b5ea8 RCX: ffff88012c3a30d0 
 RDX: ffff8801255953d8 RSI: 0000000000000000 RDI: ffff88013a2a3800 
 RBP: ffff88012c3ba770 R08: ffff88012c3a30b8 R09: ffff880001e136a0 
 R10: ffff88012c3bb598 R11: ffff88012c3a30c8 R12: ffff88013a2a3800 
 R13: ffff88013a1d0a20 R14: 0000000000000000 R15: 0000000000000000 
 FS:  0000000000000000(0000) GS:ffff880001e00000(0000) knlGS:0000000000000000 
 CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b 
 CR2: 0000000000000000 CR3: 00000001342da000 CR4: 00000000000006f0 
 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 
 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400 
 Process ocfs2_wq (pid: 4130, threadinfo ffff880123060000, task ffff88013ab38240) 
 Stack: 
  ffff88012c3a3000
  ffff88012c3a3024
  ffff88013414e580
  ffff8801255953d8
  
 
  0000000000000003
  ffffffffa030e260
  ffff88012c3a3000
  0000000000000003
  
 
  ffff8801255953d8
  0000000000000003
  0000000000000282
  ffffffffa030db11
  
 Call Trace: 
  [<ffffffffa030e260>] ? jbd2_log_wait_commit+0x3c/0x10e [jbd2] 
  [<ffffffffa030db11>] ? __jbd2_log_start_commit+0x2c/0x33 [jbd2] 
  [<ffffffffa030856b>] ? jbd2_journal_stop+0x1f7/0x21f [jbd2] 
  [<ffffffffa0308db3>] ? jbd2_journal_start+0x90/0xbf [jbd2] 
  [<ffffffffa04cd8f8>] ? ocfs2_commit_trans+0x23/0xb1 [ocfs2] 
  [<ffffffffa04d2212>] ? ocfs2_complete_local_alloc_recovery+0x2fa/0x3a1 [ocfs2] 
  [<ffffffff82029bf1>] ? update_curr+0x77/0xe4 
  [<ffffffffa04cf681>] ? ocfs2_complete_recovery+0x0/0xab2 [ocfs2] 
  [<ffffffffa04cf887>] ? ocfs2_complete_recovery+0x206/0xab2 [ocfs2] 
  [<ffffffff822fb8de>] ? schedule+0x616/0x6c4 
  [<ffffffff8204dff0>] ? prepare_to_wait+0x35/0x6d 
  [<ffffffffa04cf681>] ? ocfs2_complete_recovery+0x0/0xab2 [ocfs2] 
  [<ffffffff8204afdf>] ? worker_thread+0x14a/0x1e4 
  [<ffffffff8204de27>] ? autoremove_wake_function+0x0/0x2e 
  [<ffffffff8204ae95>] ? worker_thread+0x0/0x1e4 
  [<ffffffff8204db33>] ? kthread+0x79/0x81 
  [<ffffffff82003614>] ? kernel_thread_helper+0x4/0x10 
  [<ffffffff8204daba>] ? kthread+0x0/0x81 
  [<ffffffff82003610>] ? kernel_thread_helper+0x0/0x10 
 Code: 
 0f 
 84 
 f2 
 00 
 last message repeated 2 times
 48 
 8d 
 bd 
 a0 
 05 
 00 
 00 
 e8 
 ab 
 ba 
 19 
 00 
 48 
 8b 
 b5 
 00 
 06 
 00 
 00 
 4c 
 89 
 e7 
 e8 
 69 
 eb 
 ff 
 ff 
 49 
 89 
 c6 
 48 
 8b 
 85 
 00 
 06 
 00 
 00 
 e> 
 48 
 ff 
 00 
 fe 
 85 
 a0 
 05 
 00 
 00 
 4d 
 85 
 f6 
 0f 
 84 
 a6 
 00 
 last message repeated 2 times
 49 
 8b 
  
 RIP 
  [<ffffffff82161537>] cfq_yield+0x5f/0x135 
  RSP <ffff880123061c60> 
 CR2: 0000000000000000 
 ---[ end trace 374ddf0f57161b27 ]---