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[Ming Lei <1440536@xxxxxxxxxxxxxxxxxx>]

>From dann's reports:

1) system1
Code: 14000012 f9400273 b4000213 d1002274 (b9402280)

2) system2
Code: 14000012 f9400273 b4000213 d1002274 (b9402280)

And the upstem report in #15,
Code: 14000003 f9400273 b4000213 d1002274 (b9402282)

The code snippet should be the following in __d_lookup(): fs/dcache.c

ffffffc0001aae68:       14000003        b       ffffffc0001aae74 <__d_lookup+0x84>
         *
         * See Documentation/filesystems/path-lookup.txt for more details.
         */
        rcu_read_lock();

        hlist_bl_for_each_entry_rcu(dentry, node, b, d_hash) {
ffffffc0001aae6c:       f9400273        ldr     x19, [x19]
ffffffc0001aae70:       b40001f3        cbz     x19, ffffffc0001aaeac <__d_lookup+0xbc>

                if (dentry->d_name.hash != hash)
ffffffc0001aae74:       d1002274        sub     x20, x19, #0x8
ffffffc0001aae78:       b9402282        ldr     w2, [x20,#32]                 #faulted instruction


Then the problem should be caused by bad pointer of dcache.

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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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