I no longer have access to this hardware.

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https://bugs.launchpad.net/bugs/1048744

Title:
  ext4: unable to handle kernel NULL pointer dereference at 0000001a

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  During the execution of http://<internal>/view/sru-kernel/view
  /Quantal-lts-hwe/job/sru_kernel-quantal_lts_hwe-generic_i386_pae-
  intel_64-mga_g200ew/11/:

  Sep 10 08:31:47 phact kernel: [ 3582.684927] BUG: unable to handle kernel 
NULL pointer dereference at 0000001a
  Sep 10 08:31:47 phact kernel: [ 3582.685347] IP: [<c12d8f5f>] strchr+0xf/0x30
  Sep 10 08:31:47 phact kernel: [ 3582.685592] *pdpt = 0000000031b06001 *pde = 
0000000000000000 
  Sep 10 08:31:47 phact kernel: [ 3582.685929] Oops: 0000 [#1] SMP 
  Sep 10 08:31:47 phact kernel: [ 3582.686121] Modules linked in: quota_v2 
quota_tree btrfs zlib_deflate libcrc32c xfs ext2 dm_multipath scsi_dh vesafb 
coretemp joydev kvm microcode hid_generic dcdbas lpc_ich mac_hid lp parport 
usbhid hid mpt2sas scsi_transport_sas raid_class bnx2 [last unloaded: signpost]
  Sep 10 08:31:47 phact kernel: [ 3582.687791] 
  Sep 10 08:31:47 phact kernel: [ 3582.687887] Pid: 4568, comm: setquota 
Tainted: G           O 3.5.0-14-generic #15~precise1-Ubuntu Dell Inc. PowerEdge 
R210 II/09T7VV
  Sep 10 08:31:47 phact kernel: [ 3582.688679] EIP: 0060:[<c12d8f5f>] EFLAGS: 
00210246 CPU: 0
  Sep 10 08:31:47 phact kernel: [ 3582.688993] EIP is at strchr+0xf/0x30
  Sep 10 08:31:47 phact kernel: [ 3582.689202] EAX: 00003d3d EBX: c1604be4 ECX: 
00180000 EDX: 0000003d
  Sep 10 08:31:47 phact kernel: [ 3582.689560] ESI: 0000001a EDI: 00380800 EBP: 
e4c93eac ESP: e4c93ea8
  Sep 10 08:31:47 phact kernel: [ 3582.689953]  DS: 007b ES: 007b FS: 00d8 GS: 
00e0 SS: 0068
  Sep 10 08:31:47 phact kernel: [ 3582.690261] CR0: 8005003b CR2: 0000001a CR3: 
0fff7000 CR4: 000407f0
  Sep 10 08:31:47 phact kernel: [ 3582.690618] DR0: 00000000 DR1: 00000000 DR2: 
00000000 DR3: 00000000
  Sep 10 08:31:47 phact kernel: [ 3582.690980] DR6: ffff0ff0 DR7: 00000400
  Sep 10 08:31:47 phact kernel: [ 3582.691196] Process setquota (pid: 4568, 
ti=e4c92000 task=f19c3f70 task.ti=e4c92000)
  Sep 10 08:31:47 phact kernel: [ 3582.691642] Stack:
  Sep 10 08:31:47 phact kernel: [ 3582.691753]  0000002c e4c93ef4 c11e7fa7 
cb336540 c17b97a5 0000002c c17b8c97 00000034
  Sep 10 08:31:47 phact kernel: [ 3582.692251]  0000002c da870400 f269c000 
8c02c010 f269ac00 00000000 2c9e60d8 cb336540
  Sep 10 08:31:47 phact kernel: [ 3582.701294]  f269ac00 cb336540 00000000 
e4c93efc c11e8532 e4c93f1c c1189df6 f29e60d0
  Sep 10 08:31:47 phact kernel: [ 3582.719563] Call Trace:
  Sep 10 08:31:47 phact kernel: [ 3582.728376]  [<c11e7fa7>] 
_ext4_show_options+0xf7/0x670
  Sep 10 08:31:47 phact kernel: [ 3582.737003]  [<c11e8532>] 
ext4_show_options+0x12/0x20
  Sep 10 08:31:47 phact kernel: [ 3582.745741]  [<c1189df6>] 
show_vfsmnt+0xc6/0x110
  Sep 10 08:31:47 phact kernel: [ 3582.754474]  [<c116ca00>] m_show+0x10/0x20
  Sep 10 08:31:47 phact kernel: [ 3582.763012]  [<c1170973>] 
seq_read+0x203/0x380
  Sep 10 08:31:47 phact kernel: [ 3582.771433]  [<c11533cc>] vfs_read+0x8c/0x160
  Sep 10 08:31:47 phact kernel: [ 3582.779533]  [<c1170770>] ? 
seq_lseek+0x170/0x170
  Sep 10 08:31:47 phact kernel: [ 3582.787306]  [<c11534dd>] sys_read+0x3d/0x70
  Sep 10 08:31:47 phact kernel: [ 3582.794974]  [<c15e7e1f>] 
sysenter_do_call+0x12/0x28
  Sep 10 08:31:47 phact kernel: [ 3582.802652] Code: 19 c0 0c 01 8b 75 f8 8b 7d 
fc 89 ec 5d c3 8d b4 26 00 00 00 00 8d bc 27 00 00 00 00 55 89 e5 56 66 66 66 
66 90 89 c6 89 d0 88 c4 <ac> 38 e0 74 09 84 c0 75 f7 be 01 00 00 00 89 f0 48 5e 
5d c3 8d 
  Sep 10 08:31:47 phact kernel: [ 3582.826515] EIP: [<c12d8f5f>] 
strchr+0xf/0x30 SS:ESP 0068:e4c93ea8
  Sep 10 08:31:47 phact kernel: [ 3582.834566] CR2: 000000000000001a
  Sep 10 08:31:47 phact kernel: [ 3582.854856] ---[ end trace 0e06ca00ee7a2b7f 
]---

  Last lines of the console for the Jenkins job:

  8:31:34 INFO |        START   xfstests.233.ext4       xfstests.233.ext4       
timestamp=1347280294    localtime=Sep 10 08:31:34       
  08:31:45 INFO |               GOOD    xfstests.233.ext4       
xfstests.233.ext4       timestamp=1347280305    localtime=Sep 10 08:31:45       
completed successfully
  08:31:45 INFO |       END GOOD        xfstests.233.ext4       
xfstests.233.ext4       timestamp=1347280305    localtime=Sep 10 08:31:45       
  08:31:45 INFO |       START   xfstests.234.ext4       xfstests.234.ext4       
timestamp=1347280305    localtime=Sep 10 08:31:45       

  So it is probable the BUG happened during xfstests.234.ext4.

  'ubuntu-bug' is not finishing; I will try an 'apport-collect'.
  --- 
  AlsaDevices:
   total 0
   crw-rw---T 1 root audio 116,  1 Sep 10 14:46 seq
   crw-rw---T 1 root audio 116, 33 Sep 10 14:46 timer
  AplayDevices: Error: [Errno 2] No such file or directory
  ApportVersion: 2.0.1-0ubuntu13
  Architecture: i386
  ArecordDevices: Error: [Errno 2] No such file or directory
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', 
'/dev/snd/timer'] failed with exit code 1:
  CRDA: Error: [Errno 2] No such file or directory
  CurrentDmesg:
   
  DistroRelease: Ubuntu 12.04
  HibernationDevice: RESUME=UUID=1fb95ad1-30aa-46cc-bea0-ce63b2d62f29
  IwConfig: Error: [Errno 2] No such file or directory
  MachineType: Dell Inc. PowerEdge R210 II
  Package: linux (not installed)
  PciMultimedia:
   
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-14-generic 
root=UUID=ce655edd-548e-458d-9195-113022b84e9c ro quiet
  ProcVersionSignature: Ubuntu 3.5.0-14.15~precise1-generic 3.5.3
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-14-generic N/A
   linux-backports-modules-3.5.0-14-generic  N/A
   linux-firmware                            1.79.1
  RfKill: Error: [Errno 2] No such file or directory
  Tags:  precise
  Uname: Linux 3.5.0-14-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dialout lpadmin plugdev sambashare sudo
  dmi.bios.date: 05/06/2011
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 1.1.1
  dmi.board.name: 09T7VV
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A01
  dmi.chassis.type: 23
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: 
dmi:bvnDellInc.:bvr1.1.1:bd05/06/2011:svnDellInc.:pnPowerEdgeR210II:pvr:rvnDellInc.:rn09T7VV:rvrA01:cvnDellInc.:ct23:cvr:
  dmi.product.name: PowerEdge R210 II
  dmi.sys.vendor: Dell Inc.

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