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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This change was made by a bot.

** Changed in: linux (Ubuntu)
       Status: New => Confirmed

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https://bugs.launchpad.net/bugs/1218863

Title:
  Kernel Oops unable to handle kernel NULL pointer dereference at
  0000000000000ffc

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  I'm experiencing infrequent kernel oops situations (I think that's the
  correct term) running 13.04 with kernel Ubuntu 3.8.0-29.42-generic
  3.8.13.5.

  This is a days-old machine with an up-to-date install of 13.04.

  I'm not able to make this happen at will and as such cannot narrow it
  down to any particular application or process.

  Below is the most recent relevant log entries from /var/log/syslog.

  I'm happy to provide further information but at present I don't
  understand the situation clearly enough to know what might be useful
  or relevant.

  ---
  Aug 30 11:50:49 swombat kernel: [67837.896357] BUG: unable to handle kernel NULL pointer dereference at 0000000000000ffc
  Aug 30 11:50:49 swombat kernel: [67837.896381] IP: [<ffffffff811ac0f0>] __d_lookup_rcu+0x80/0x160
  Aug 30 11:50:49 swombat kernel: [67837.896400] PGD 7d9da7067 PUD 7d9f76067 PMD 0 
  Aug 30 11:50:49 swombat kernel: [67837.896413] Oops: 0000 [#2] SMP 
  Aug 30 11:50:49 swombat kernel: [67837.896423] Modules linked in: snd_hda_codec_realtek snd_hda_codec_hdmi hid_generic usbhid hid rfcomm bnep bluetooth coretemp kvm_intel kvm ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) xts(F) lrw(F) gf128mul(F) ablk_helper(F) cryptd(F) arc4(F) ppdev(F) ath9k ath9k_common ath9k_hw ath snd_seq_midi(F) snd_seq_midi_event(F) mac80211 snd_rawmidi(F) snd_hda_intel cfg80211 snd_hda_codec psmouse(F) snd_hwdep(F) microcode(F) i915 serio_raw(F) snd_pcm(F) lpc_ich snd_seq(F) snd_seq_device(F) video(F) snd_page_alloc(F) drm_kms_helper parport_pc(F) snd_timer(F) mac_hid drm nls_iso8859_1(F) snd(F) i2c_algo_bit soundcore(F) mei lp(F) parport(F) ahci(F) r8169 libahci(F)
  Aug 30 11:50:49 swombat kernel: [67837.896598] CPU 1 
  Aug 30 11:50:49 swombat kernel: [67837.896605] Pid: 27640, comm: java Tainted: GF     D      3.8.0-29-generic #42-Ubuntu Gigabyte Technology Co., Ltd. H87-HD3/H87-HD3
  Aug 30 11:50:49 swombat kernel: [67837.896631] RIP: 0010:[<ffffffff811ac0f0>]  [<ffffffff811ac0f0>] __d_lookup_rcu+0x80/0x160
  Aug 30 11:50:49 swombat kernel: [67837.896651] RSP: 0018:ffff8806e387dc50  EFLAGS: 00010206
  Aug 30 11:50:49 swombat kernel: [67837.896664] RAX: 0000000000000000 RBX: 0000000000001000 RCX: 0000000000000016
  Aug 30 11:50:49 swombat kernel: [67837.896679] RDX: ffffc90005101000 RSI: ffff8806e387dde8 RDI: ffff88075a7690c0
  Aug 30 11:50:49 swombat kernel: [67837.896695] RBP: ffff8806e387dc98 R08: 8080808080808080 R09: ffff8806e387dde8
  Aug 30 11:50:49 swombat kernel: [67837.896711] R10: ffff88080c7ca077 R11: 000000000000000a R12: ffff88075a7690c0
  Aug 30 11:50:49 swombat kernel: [67837.896727] R13: 0000000000000ff8 R14: 0000000a44cc80ce R15: ffff8806e387dcc4
  Aug 30 11:50:49 swombat kernel: [67837.896743] FS:  00007f0f679ae700(0000) GS:ffff88083e240000(0000) knlGS:0000000000000000
  Aug 30 11:50:49 swombat kernel: [67837.896761] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  Aug 30 11:50:49 swombat kernel: [67837.897691] CR2: 0000000000000ffc CR3: 00000007d9e2f000 CR4: 00000000001407e0
  Aug 30 11:50:49 swombat kernel: [67837.898619] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
  Aug 30 11:50:49 swombat kernel: [67837.899542] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
  Aug 30 11:50:49 swombat kernel: [67837.900463] Process java (pid: 27640, threadinfo ffff8806e387c000, task ffff88080dd50000)
  Aug 30 11:50:49 swombat kernel: [67837.901366] Stack:
  Aug 30 11:50:49 swombat kernel: [67837.902234]  ffff8806e387dca0 ffffffff81233540 ffff8806e387dc80 ffff88075a7d1d30
  Aug 30 11:50:49 swombat kernel: [67837.903095]  ffff88075a7690c0 ffff8806e387dd38 0000000000000051 ffff8806e387ddd8
  Aug 30 11:50:49 swombat kernel: [67837.903929]  ffff8806e387dd40 ffff8806e387dcf0 ffffffff811a0564 ffff88080e0e5120
  Aug 30 11:50:49 swombat kernel: [67837.904763] Call Trace:
  Aug 30 11:50:49 swombat kernel: [67837.905579]  [<ffffffff81233540>] ? ext4_map_blocks+0x200/0x2a0
  Aug 30 11:50:49 swombat kernel: [67837.906389]  [<ffffffff811a0564>] lookup_fast+0x44/0x2e0
  Aug 30 11:50:49 swombat kernel: [67837.907193]  [<ffffffff8119fa36>] ? complete_walk+0xa6/0x130
  Aug 30 11:50:49 swombat kernel: [67837.907992]  [<ffffffff811a27cc>] path_lookupat+0x11c/0x740
  Aug 30 11:50:49 swombat kernel: [67837.908788]  [<ffffffff8123c148>] ? htree_dirblock_to_tree+0x148/0x200
  Aug 30 11:50:49 swombat kernel: [67837.909587]  [<ffffffff8117d431>] ? kmem_cache_alloc+0x31/0x130
  Aug 30 11:50:49 swombat kernel: [67837.910381]  [<ffffffff811a2e24>] filename_lookup+0x34/0xc0
  Aug 30 11:50:49 swombat kernel: [67837.911171]  [<ffffffff811a3efc>] user_path_at_empty+0x8c/0x100
  Aug 30 11:50:49 swombat kernel: [67837.911956]  [<ffffffff81309174>] ? apparmor_inode_getattr+0x54/0x60
  Aug 30 11:50:49 swombat kernel: [67837.912737]  [<ffffffff81085e8a>] ? lg_local_unlock+0x1a/0x20
  Aug 30 11:50:49 swombat kernel: [67837.913515]  [<ffffffff8119923a>] ? cp_new_stat+0x11a/0x130
  Aug 30 11:50:49 swombat kernel: [67837.914460]  [<ffffffff811a3f81>] user_path_at+0x11/0x20
  Aug 30 11:50:49 swombat kernel: [67837.915242]  [<ffffffff811994e2>] vfs_fstatat+0x52/0xb0
  Aug 30 11:50:49 swombat kernel: [67837.916014]  [<ffffffff8119957b>] vfs_stat+0x1b/0x20
  Aug 30 11:50:49 swombat kernel: [67837.916775]  [<ffffffff811997ba>] sys_newstat+0x1a/0x40
  Aug 30 11:50:49 swombat kernel: [67837.917529]  [<ffffffff816d561d>] system_call_fastpath+0x1a/0x1f
  Aug 30 11:50:49 swombat kernel: [67837.918280] Code: 83 e3 fe 0f 84 b2 00 00 00 4d 89 f3 49 c1 eb 20 eb 15 66 0f 1f 84 00 00 00 00 00 48 8b 1b 48 85 db 0f 84 94 00 00 00 4c 8d 6b f8 <8b> 43 fc 4c 39 63 10 75 e7 48 83 7b 08 00 74 e0 89 c1 83 e1 fe 
  Aug 30 11:50:49 swombat kernel: [67837.919906] RIP  [<ffffffff811ac0f0>] __d_lookup_rcu+0x80/0x160
  Aug 30 11:50:49 swombat kernel: [67837.920705]  RSP <ffff8806e387dc50>
  Aug 30 11:50:49 swombat kernel: [67837.921499] CR2: 0000000000000ffc
  Aug 30 11:50:49 swombat kernel: [67837.939480] ---[ end trace 3068c08641379cf1 ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-3.8.0-29-generic 3.8.0-29.42
  ProcVersionSignature: Ubuntu 3.8.0-29.42-generic 3.8.13.5
  Uname: Linux 3.8.0-29-generic x86_64
  ApportVersion: 2.9.2-0ubuntu8.3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  jon        2276 F.... pulseaudio
   /dev/snd/controlC0:  jon        2276 F.... pulseaudio
  CRDA:
   country AU:
   	(2402 - 2482 @ 40), (N/A, 20)
   	(5170 - 5250 @ 40), (3, 23)
   	(5250 - 5330 @ 40), (3, 23), DFS
   	(5735 - 5835 @ 40), (3, 30)
  Date: Fri Aug 30 12:33:31 2013
  HibernationDevice: RESUME=UUID=c260cba0-05d0-4330-9a20-3c8afb9485c4
  InstallationDate: Installed on 2013-08-23 (7 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release amd64 (20130424)
  MachineType: Gigabyte Technology Co., Ltd. H87-HD3
  MarkForUpload: True
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-29-generic root=UUID=732cb997-6913-43ea-a27b-483e7b020cf6 ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.8.0-29-generic N/A
   linux-backports-modules-3.8.0-29-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 08/03/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: F5
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H87-HD3
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF5:bd08/03/2013:svnGigabyteTechnologyCo.,Ltd.:pnH87-HD3:pvrTobefilledbyO.E.M.:rvnGigabyteTechnologyCo.,Ltd.:rnH87-HD3:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvrToBeFilledByO.E.M.:
  dmi.product.name: H87-HD3
  dmi.product.version: To be filled by O.E.M.
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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