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[Bug 1048744] Re: ext4: unable to handle kernel NULL pointer dereference at 0000001a

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C de-Avillez, this bug report is being closed due to your last comment
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1048744/comments/18
regarding you no longer have access to the hardware. For future
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** Changed in: linux (Ubuntu)
       Status: Incomplete => Invalid

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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:
  Invalid

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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