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[Ming Lei <1440536@xxxxxxxxxxxxxxxxxx>]

BTW, looks it isn't related with specific filesystem, and from the recent triger, it happened when
walking path inside proc filesystem:

[24993.562923] Call trace:
[24993.565357] [<ffffffc00022a278>] __d_lookup+0x88/0x194
[24993.570467] [<ffffffc00022a3bc>] d_lookup+0x38/0x64
[24993.575319] [<ffffffc00022a43c>] d_hash_and_lookup+0x54/0x6c
[24993.580948] [<ffffffc00027e1a4>] proc_flush_task+0xa8/0x1a8
[24993.586491] [<ffffffc0000b6920>] release_task+0x5c/0x46c
[24993.591774] [<ffffffc0000b6e70>] wait_task_zombie+0x140/0x67c
[24993.597489] [<ffffffc0000b7734>] wait_consider_task+0x388/0x670
[24993.603377] [<ffffffc0000b7b04>] do_wait+0xe8/0x234
[24993.608229] [<ffffffc0000b8cf4>] SyS_wait4+0x7c/0xe8


Also from the link in #15, looks it is still triggered on arm64 from the register information
in the log.

So it might be one arm64 dependent issue.

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https://bugs.launchpad.net/bugs/1440536

Title:
  Oops __d_lookup+0x88/0x194

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Triaged
Status in linux source package in Vivid:
  Triaged

Bug description:
  This started happening on a Mustang board after upgrading to
  3.19.0-9.9 and persists in 3.19.0-11.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-11-generic 3.19.0-11.11
  ProcVersionSignature: Ubuntu 3.19.0-11.11-generic 3.19.3
  Uname: Linux 3.19.0-11-generic aarch64
  AlsaDevices:
   total 0
   crw-rw---- 1 root audio 116,  1 Dec 31  1969 seq
   crw-rw---- 1 root audio 116, 33 Dec 31  1969 timer
  AplayDevices: Error: [Errno 2] No such file or directory: 'aplay'
  ApportVersion: 2.17-0ubuntu1
  Architecture: arm64
  ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord'
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/timer', '/dev/snd/seq'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory: 'iw'
  Date: Sun Apr  5 08:32:28 2015
  HibernationDevice: RESUME=UUID=014663f6-5135-4075-bf04-d2f42c4fc90b
  IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig'
  Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to initialize libusb: -99
  PciMultimedia:
   
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB:
   
  ProcKernelCmdLine: console=ttyS0,115200n8 ro earlyprintk=uart8250-32bit,0x1c020000
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-11-generic N/A
   linux-backports-modules-3.19.0-11-generic  N/A
   linux-firmware                             1.143
  RfKill: Error: [Errno 2] No such file or directory: 'rfkill'
  SourcePackage: linux
  SystemImageInfo:
   current build number: 0
   device name: ?
   channel: daily
   last update: Unknown
  UpgradeStatus: No upgrade log present (probably fresh install)

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