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["Christopher M. Penalver" <christopher.m.penalver@xxxxxxxxx>]

Cam Cope, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1553400

** Package changed: linux-lts-wily (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
   Importance: Undecided => Low

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

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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:
  Incomplete

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)

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