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[Launchpad Bug Tracker <1553400@xxxxxxxxxxxxxxxxxx>]

[Expired for linux (Ubuntu) because there has been no activity for 60
days.]

** Changed in: linux (Ubuntu)
       Status: Incomplete => Expired

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https://bugs.launchpad.net/bugs/1553400

Title:
  BUG: unable to handle kernel NULL pointer dereference at
  (null)

Status in linux package in Ubuntu:
  Expired

Bug description:
  Filesystem IO has started hanging when trying to access certain
  directories. Relevant kernel oops below:

  [12779.747913] BUG: unable to handle kernel NULL pointer dereference at           (null)
  [12779.747961] IP: [<ffffffff81215e32>] locked_inode_to_wb_and_lock_list+0x22/0xd0
  [12779.748004] PGD 743c6067 PUD 1490067 PMD 0 
  [12779.748028] Oops: 0000 [#1] SMP 
  [12779.748047] Modules linked in: sunrpc veth ctr ccm pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables cmac hid_multitouch btusb btrtl btbcm btintel hid_logitech_hidpp pn544_mei mei_phy pn544 hci nfc uvcvideo vi
  deobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media rfcomm bnep dell_wmi sparse_keymap bluetooth arc4 dell_laptop dcdbas dell_smm_hwmon intel_rapl x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_hdmi coretemp snd_hda_codec_realtek snd_hda_codec_generic kvm_intel snd_hda_intel kvm binfmt_misc snd_hda_codec snd_hda_core snd_soc_rt5640 snd_soc_rl6231 snd_soc_core snd_hwdep snd_compress ac97_bus snd_
  pcm_dmaengine iwlmvm snd_pcm mac80211 snd_seq_midi snd_seq_midi_event snd_rawmidi joydev input_leds iwlwifi serio_raw snd_seq cfg80211 snd_seq_device lpc_ich snd_timer 8250_fintek i2c_hid snd i2c_designware_platform dw_dmac dell_smo8800 i2c_designware_core dw_dmac_core snd_soc_sst_acpi 8250_dw shpchp dell_rbtn soundcore mei_me spi_pxa2xx_platform mei mac_hid nls_iso8859_1 parport_pc ppdev lp parport drbg ansi_cprng hid_log
  itech_dj hid_generic dm_crypt usbhid hid crct10dif_pclmul crc32_pclmul aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper i915 cryptd psmouse ahci libahci e1000e sdhci_pci ptp i2c_algo_bit pps_core drm_kms_helper drm wmi video sdhci_acpi sdhci
  [12779.748879] CPU: 0 PID: 25793 Comm: node Tainted: G        W  OE   4.2.0-30-generic #36~14.04.1-Ubuntu
  [12779.748931] Hardware name: Dell Inc. Latitude E7440/085VV3, BIOS A15 05/19/2015
  [12779.748973] task: ffff880228d85280 ti: ffff88040b7a4000 task.ti: ffff88040b7a4000
  [12779.749013] RIP: 0010:[<ffffffff81215e32>]  [<ffffffff81215e32>] locked_inode_to_wb_and_lock_list+0x22/0xd0
  [12779.749068] RSP: 0018:ffff88040b7a7838  EFLAGS: 00010246
  [12779.749095] RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff8802f51a1a00
  [12779.749131] RDX: 0000000000000001 RSI: ffff8802f51a2230 RDI: ffff8802f51a1cf8
  [12779.749170] RBP: ffff88040b7a7858 R08: 0000000000000000 R09: 0000000000000246
  [12779.749206] R10: 000000000eb61400 R11: ffffea000ce357c0 R12: ffff8802f51a1cf8
  [12779.749241] R13: ffff8802f51a1d80 R14: 0000000000000000 R15: 0000000000000125
  [12779.749275] FS:  00007f5bc8a24740(0000) GS:ffff88041ea00000(0000) knlGS:0000000000000000
  [12779.749316] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
  [12779.749345] CR2: 0000000000000000 CR3: 00000000d4d3a000 CR4: 00000000001406f0
  [12779.749380] Stack:
  [12779.749391]  ffff8802f51a1cf8 000000000000009d ffffffff81832e80 0000000000000000
  [12779.749430]  ffff88040b7a7878 ffffffff81217c43 ffff8802f51a1cf8 000000000000009d
  [12779.749469]  ffff88040b7a78a8 ffffffff812051f3 ffff88040b7a78c8 ffff88040b7a78d8
  [12779.749514] Call Trace:
  [12779.749533]  [<ffffffff81217c43>] inode_wb_list_del+0x23/0x50
  [12779.749566]  [<ffffffff812051f3>] evict+0x53/0x180
  [12779.749592]  [<ffffffff8120535a>] dispose_list+0x3a/0x50
  [12779.749619]  [<ffffffff8120634b>] prune_icache_sb+0x4b/0x60
  [12779.749645]  [<ffffffff811ee341>] super_cache_scan+0x141/0x190
  [12779.749676]  [<ffffffff811873c7>] shrink_slab+0x207/0x380
  [12779.749703]  [<ffffffff8118ba81>] shrink_zone+0x291/0x2b0
  [12779.749729]  [<ffffffff8118bdfc>] do_try_to_free_pages+0x15c/0x420
  [12779.749759]  [<ffffffff81187800>] ? pfmemalloc_watermark_ok+0xc0/0xe0
  [12779.749788]  [<ffffffff8118c174>] try_to_free_pages+0xb4/0x140
  [12779.749818]  [<ffffffff8117f47f>] __alloc_pages_nodemask+0x5af/0x990
  [12779.749855]  [<ffffffff811a28c6>] ? free_pgtables+0xc6/0x110
  [12779.749890]  [<ffffffff811c4fbe>] alloc_pages_vma+0x1de/0x200
  [12779.749925]  [<ffffffff811d8506>] do_huge_pmd_anonymous_page+0x116/0x410
  [12779.749964]  [<ffffffff811a4fdc>] handle_mm_fault+0x18c/0x1810
  [12779.749998]  [<ffffffff8130b2ca>] ? security_mmap_file+0xca/0xe0
  [12779.750033]  [<ffffffff811928c8>] ? vm_mmap_pgoff+0x98/0xc0
  [12779.750066]  [<ffffffff810641aa>] __do_page_fault+0x19a/0x430
  [12779.750100]  [<ffffffff81064462>] do_page_fault+0x22/0x30
  [12779.750133]  [<ffffffff817be288>] page_fault+0x28/0x30
  [12779.750163] Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 55 48 89 e5 41 56 41 55 4c 8d af 88 00 00 00 41 54 49 89 fc 53 49 8b 9c 24 00 01 00 00 <48> 8b 03 48 83 c0 50 48 39 c3 74 13 48 8b 83 10 02 00 00 a8 03 
  [12779.750307] RIP  [<ffffffff81215e32>] locked_inode_to_wb_and_lock_list+0x22/0xd0
  [12779.750346]  RSP <ffff88040b7a7838>
  [12779.750366] CR2: 0000000000000000
  [12779.763870] ---[ end trace b25060b9125dac0c ]---

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-4.2.0-30-generic 4.2.0-30.36~14.04.1
  ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
  Uname: Linux 4.2.0-30-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Fri Mar  4 14:52:40 2016
  InstallationDate: Installed on 2014-09-10 (541 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  SourcePackage: linux-lts-wily
  UpgradeStatus: No upgrade log present (probably fresh install)
  --- 
  ApportVersion: 2.14.1-0ubuntu3.19
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  cam        2962 F.... pulseaudio
   /dev/snd/controlC0:  cam        2962 F.... pulseaudio
  CurrentDesktop: Unity
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=d2bd3c85-b38b-480e-be7a-f0734ebc822f
  InstallationDate: Installed on 2014-09-10 (544 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: Dell Inc. Latitude E7440
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-30-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash intel_pstate=enable vt.handoff=7
  ProcVersionSignature: Ubuntu 4.2.0-30.36~14.04.1-generic 4.2.8-ckt3
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-30-generic N/A
   linux-backports-modules-4.2.0-30-generic  N/A
   linux-firmware                            1.127.20
  Tags:  trusty
  Uname: Linux 4.2.0-30-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin lxd plugdev sambashare sudo wireshark
  _MarkForUpload: True
  dmi.bios.date: 05/19/2015
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A15
  dmi.board.name: 085VV3
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvrA15:bd05/19/2015:svnDellInc.:pnLatitudeE7440:pvr01:rvnDellInc.:rn085VV3:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Latitude E7440
  dmi.product.version: 01
  dmi.sys.vendor: Dell Inc.

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