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

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C de-Avillez, as per
http://www.dell.com/support/troubleshooting/us/en/19/Product/poweredge-r210-2
an update is available for your BIOS (2.4.3). If you update to this
during your maintenance window, does it change anything?

If not, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

** Tags added: bios-outdated-2.4.3 regression-potential

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

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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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