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[Bug 1393151] [NEW] Writing to ext4 LVM FS causes GPF in mpage_process_page_bufs

 

Public bug reported:

Writing data to a 3 TB ext4-formatted logical volume on a 2x6 TB mdadm
raid 1 mirror always results in a GPF within 1 minute of writing the
data. Disks seem to be OK smart-wise.

When the GPF occurs, the md1 raid volume gets degrated, the entire
system gets irresponsive and after the next boot (hard reset), the  raid
syncing starts from scratch (which takes 10 hours with the two 6 TB
drives).

The GPF always happens in mpage_process_page_bufs:

Nov 16 09:26:03 nas kernel: [  230.610495] ------------[ cut here ]------------
Nov 16 09:26:03 nas kernel: [  230.610510] WARNING: CPU: 1 PID: 1927 at /build/buildd/linux-3.13.0/kernel/exit.c:711 do_exit+0x55/0xa50()
Nov 16 09:26:03 nas kernel: [  230.610531] Modules linked in: ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables snd_hda_codec_hdmi arc4 bridge stp llc x86_pkg_temp_thermal intel_powerc$
Nov 16 09:26:03 nas kernel: [  230.610810] CPU: 1 PID: 1927 Comm: vsftpd Tainted: G      D       3.13.0-39-generic #66-Ubuntu
Nov 16 09:26:03 nas kernel: [  230.610830] Hardware name: Gigabyte Technology Co., Ltd. H97N-WIFI/H97N-WIFI, BIOS F4 06/28/2014
Nov 16 09:26:03 nas kernel: [  230.610849]  0000000000000009 ffff8800cb61d9e0 ffffffff8171ece7 0000000000000000
Nov 16 09:26:03 nas kernel: [  230.610877]  ffff8800cb61da18 ffffffff8106773d 000000000000000b ffff8800cb61db38
Nov 16 09:26:03 nas kernel: [  230.610898]  0000000000000246 0000000000000000 ffff8800cb633000 ffff8800cb61da28
Nov 16 09:26:03 nas kernel: [  230.610920] Call Trace:
Nov 16 09:26:03 nas kernel: [  230.610928]  [<ffffffff8171ece7>] dump_stack+0x45/0x56
Nov 16 09:26:03 nas kernel: [  230.610941]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
Nov 16 09:26:03 nas kernel: [  230.610956]  [<ffffffff8106781a>] warn_slowpath_null+0x1a/0x20
Nov 16 09:26:03 nas kernel: [  230.610970]  [<ffffffff81069a45>] do_exit+0x55/0xa50
Nov 16 09:26:03 nas kernel: [  230.610984]  [<ffffffff817282b9>] oops_end+0xa9/0x150
Nov 16 09:26:03 nas kernel: [  230.610997]  [<ffffffff810171cb>] die+0x4b/0x70
Nov 16 09:26:03 nas kernel: [  230.611008]  [<ffffffff81727c4e>] do_general_protection+0x11e/0x1b0
Nov 16 09:26:03 nas kernel: [  230.611024]  [<ffffffff81727568>] general_protection+0x28/0x30
Nov 16 09:26:03 nas kernel: [  230.611039]  [<ffffffff8123e0b8>] ? mpage_process_page_bufs+0x38/0x130
Nov 16 09:26:03 nas kernel: [  230.611055]  [<ffffffff8123f0e9>] mpage_prepare_extent_to_map+0x219/0x2c0
Nov 16 09:26:03 nas kernel: [  230.611071]  [<ffffffff81242ef2>] ext4_writepages+0x3f2/0xd20
Nov 16 09:26:03 nas kernel: [  230.611086]  [<ffffffff8115a9be>] do_writepages+0x1e/0x40
Nov 16 09:26:03 nas kernel: [  230.611101]  [<ffffffff8114fac9>] __filemap_fdatawrite_range+0x59/0x60
Nov 16 09:26:03 nas kernel: [  230.611117]  [<ffffffff8114fb7c>] filemap_flush+0x1c/0x20
Nov 16 09:26:03 nas kernel: [  230.611130]  [<ffffffff81240928>] ext4_alloc_da_blocks+0x38/0x70
Nov 16 09:26:03 nas kernel: [  230.611156]  [<ffffffff81239e89>] ext4_release_file+0x79/0xc0
Nov 16 09:26:03 nas kernel: [  230.611171]  [<ffffffff811bed84>] __fput+0xe4/0x260
Nov 16 09:26:03 nas kernel: [  230.611184]  [<ffffffff811bef4e>] ____fput+0xe/0x10
Nov 16 09:26:03 nas kernel: [  230.611197]  [<ffffffff81088227>] task_work_run+0xa7/0xe0
Nov 16 09:26:03 nas kernel: [  230.611210]  [<ffffffff81013df7>] do_notify_resume+0x97/0xb0
Nov 16 09:26:03 nas kernel: [  230.611225]  [<ffffffff8172faaa>] int_signal+0x12/0x17
Nov 16 09:26:03 nas kernel: [  230.612259] ---[ end trace c2c7ff1f119c2b75 ]---

----------------------------------------------------------------------------------------

apt-cache policy e2fslibs:amd64
e2fslibs:
  Installed: 1.42.9-3ubuntu1
  Candidate: 1.42.9-3ubuntu1
  Version table:
 *** 1.42.9-3ubuntu1 0
        500 http://ch.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
        100 /var/lib/dpkg/status

----------------------------------------------------------------------------------------

smartctl -H /dev/sdc
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

smartctl -H /dev/sdc
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

 smartctl -H /dev/sdd
smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

----------------------------------------------------------------------------------------
/dev/md1:
        Version : 1.2
  Creation Time : Sat Nov 15 20:27:36 2014
     Raid Level : raid1
     Array Size : 5860389696 (5588.90 GiB 6001.04 GB)
  Used Dev Size : 5860389696 (5588.90 GiB 6001.04 GB)
   Raid Devices : 2
  Total Devices : 2
    Persistence : Superblock is persistent

  Intent Bitmap : Internal

    Update Time : Sun Nov 16 09:15:47 2014
          State : active
 Active Devices : 2
Working Devices : 2
 Failed Devices : 0
  Spare Devices : 0

           Name : nas:1  (local to host nas)
           UUID : 035d6d6e:d213adb0:56b6b6d8:d0cf202c
         Events : 155

    Number   Major   Minor   RaidDevice State
       0       8       33        0      active sync   /dev/sdc1
       1       8       49        1      active sync   /dev/sdd1
----------------------------------------------------------------------------------------

  --- Physical volume ---
  PV Name               /dev/md1
  VG Name               vg_hdd1
  PV Size               5.46 TiB / not usable 4.81 MiB
  Allocatable           yes
  PE Size               4.00 MiB
  Total PE              1430758
  Free PE               644326
  Allocated PE          786432
  PV UUID               M0yvqu-vnTR-lNVg-nxRL-CSzK-hVCD-DDWcet

----------------------------------------------------------------------------------------

  --- Volume group ---
  VG Name               vg_hdd1
  System ID
  Format                lvm2
  Metadata Areas        1
  Metadata Sequence No  2
  VG Access             read/write
  VG Status             resizable
  MAX LV                0
  Cur LV                1
  Open LV               0
  Max PV                0
  Cur PV                1
  Act PV                1
  VG Size               5.46 TiB
  PE Size               4.00 MiB
  Total PE              1430758
  Alloc PE / Size       786432 / 3.00 TiB
  Free  PE / Size       644326 / 2.46 TiB
  VG UUID               MVW4e0-oeYT-RKPp-j2E9-7RT2-WBjt-Zof2Nn

----------------------------------------------------------------------------------------

  --- Logical volume ---
  LV Path                /dev/vg_hdd1/lv_share
  LV Name                lv_share
  VG Name                vg_hdd1
  LV UUID                VhywGd-c3kY-IXRd-SomS-ypAe-a4rg-5oQKKE
  LV Write Access        read/write
  LV Creation host, time nas, 2014-11-16 09:17:51 +0100
  LV Status              available
  # open                 0
  LV Size                3.00 TiB
  Current LE             786432
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           252:4

----------------------------------------------------------------------------------------

lshw -short
H/W path       Device     Class          Description
====================================================
                          system         H97N-WIFI (To be filled by O.E.M.)
/0                        bus            H97N-WIFI
/0/0                      memory         64KiB BIOS
/0/3d                     processor      Intel(R) Core(TM) i3-4160 CPU @ 3.60GHz
/0/3d/3e                  memory         128KiB L1 cache
/0/3d/3f                  memory         512KiB L2 cache
/0/3d/40                  memory         3MiB L3 cache
/0/42                     memory         8GiB System Memory
/0/42/0                   memory         4GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
/0/42/1                   memory         DIMM [empty]
/0/42/2                   memory         4GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
/0/42/3                   memory         DIMM [empty]
/0/100                    bridge         4th Gen Core Processor DRAM Controller
/0/100/2                  display        Intel Corporation
/0/100/3                  multimedia     Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller
/0/100/14                 bus            Intel Corporation
/0/100/16                 communication  Intel Corporation
/0/100/19      eth1       network        Ethernet Connection I217-V
/0/100/1a                 bus            Intel Corporation
/0/100/1b                 multimedia     Intel Corporation
/0/100/1c                 bridge         Intel Corporation
/0/100/1c.3               bridge         Intel Corporation
/0/100/1c.3/0  eth0       network        AR8161 Gigabit Ethernet
/0/100/1c.4               bridge         Intel Corporation
/0/100/1c.4/0  wlan0      network        Wireless 7260
/0/100/1d                 bus            Intel Corporation
/0/100/1f                 bridge         Intel Corporation
/0/100/1f.2               storage        Intel Corporation
/0/100/1f.3               bus            Intel Corporation
/0/1           scsi1      storage
/0/1/0.0.0     /dev/sda   disk           120GB INTEL SSDSC2CT12
/0/1/0.0.0/1   /dev/sda1  volume         510MiB Windows FAT volume
/0/1/0.0.0/2   /dev/sda2  volume         111GiB RAID partition
/0/2           scsi3      storage
/0/2/0.0.0     /dev/sdb   disk           120GB INTEL SSDSC2CT12
/0/2/0.0.0/1   /dev/sdb1  volume         510MiB Windows FAT volume
/0/2/0.0.0/2   /dev/sdb2  volume         111GiB RAID partition
/0/3           scsi4      storage
/0/3/0.0.0     /dev/sdc   disk           6001GB WDC WD60EFRX-68M
/0/3/0.0.0/1   /dev/sdc1  volume         5589GiB RAID partition
/0/4           scsi5      storage
/0/4/0.0.0     /dev/sdd   disk           6001GB WDC WD60EFRX-68M
/0/4/0.0.0/1   /dev/sdd1  volume         5589GiB RAID partition
/1                        power          To Be Filled By O.E.M.

----------------------------------------------------------------------------------------

Linux nas 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux

Description:	Ubuntu 14.04.1 LTS
Release:	14.04

** Affects: e2fsprogs (Ubuntu)
     Importance: Undecided
         Status: New

-- 
You received this bug notification because you are a member of Ubuntu
Touch seeded packages, which is subscribed to e2fsprogs in Ubuntu.
https://bugs.launchpad.net/bugs/1393151

Title:
  Writing to ext4 LVM FS causes GPF in mpage_process_page_bufs

Status in “e2fsprogs” package in Ubuntu:
  New

Bug description:
  Writing data to a 3 TB ext4-formatted logical volume on a 2x6 TB mdadm
  raid 1 mirror always results in a GPF within 1 minute of writing the
  data. Disks seem to be OK smart-wise.

  When the GPF occurs, the md1 raid volume gets degrated, the entire
  system gets irresponsive and after the next boot (hard reset), the
  raid syncing starts from scratch (which takes 10 hours with the two 6
  TB drives).

  The GPF always happens in mpage_process_page_bufs:

  Nov 16 09:26:03 nas kernel: [  230.610495] ------------[ cut here ]------------
  Nov 16 09:26:03 nas kernel: [  230.610510] WARNING: CPU: 1 PID: 1927 at /build/buildd/linux-3.13.0/kernel/exit.c:711 do_exit+0x55/0xa50()
  Nov 16 09:26:03 nas kernel: [  230.610531] Modules linked in: ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables snd_hda_codec_hdmi arc4 bridge stp llc x86_pkg_temp_thermal intel_powerc$
  Nov 16 09:26:03 nas kernel: [  230.610810] CPU: 1 PID: 1927 Comm: vsftpd Tainted: G      D       3.13.0-39-generic #66-Ubuntu
  Nov 16 09:26:03 nas kernel: [  230.610830] Hardware name: Gigabyte Technology Co., Ltd. H97N-WIFI/H97N-WIFI, BIOS F4 06/28/2014
  Nov 16 09:26:03 nas kernel: [  230.610849]  0000000000000009 ffff8800cb61d9e0 ffffffff8171ece7 0000000000000000
  Nov 16 09:26:03 nas kernel: [  230.610877]  ffff8800cb61da18 ffffffff8106773d 000000000000000b ffff8800cb61db38
  Nov 16 09:26:03 nas kernel: [  230.610898]  0000000000000246 0000000000000000 ffff8800cb633000 ffff8800cb61da28
  Nov 16 09:26:03 nas kernel: [  230.610920] Call Trace:
  Nov 16 09:26:03 nas kernel: [  230.610928]  [<ffffffff8171ece7>] dump_stack+0x45/0x56
  Nov 16 09:26:03 nas kernel: [  230.610941]  [<ffffffff8106773d>] warn_slowpath_common+0x7d/0xa0
  Nov 16 09:26:03 nas kernel: [  230.610956]  [<ffffffff8106781a>] warn_slowpath_null+0x1a/0x20
  Nov 16 09:26:03 nas kernel: [  230.610970]  [<ffffffff81069a45>] do_exit+0x55/0xa50
  Nov 16 09:26:03 nas kernel: [  230.610984]  [<ffffffff817282b9>] oops_end+0xa9/0x150
  Nov 16 09:26:03 nas kernel: [  230.610997]  [<ffffffff810171cb>] die+0x4b/0x70
  Nov 16 09:26:03 nas kernel: [  230.611008]  [<ffffffff81727c4e>] do_general_protection+0x11e/0x1b0
  Nov 16 09:26:03 nas kernel: [  230.611024]  [<ffffffff81727568>] general_protection+0x28/0x30
  Nov 16 09:26:03 nas kernel: [  230.611039]  [<ffffffff8123e0b8>] ? mpage_process_page_bufs+0x38/0x130
  Nov 16 09:26:03 nas kernel: [  230.611055]  [<ffffffff8123f0e9>] mpage_prepare_extent_to_map+0x219/0x2c0
  Nov 16 09:26:03 nas kernel: [  230.611071]  [<ffffffff81242ef2>] ext4_writepages+0x3f2/0xd20
  Nov 16 09:26:03 nas kernel: [  230.611086]  [<ffffffff8115a9be>] do_writepages+0x1e/0x40
  Nov 16 09:26:03 nas kernel: [  230.611101]  [<ffffffff8114fac9>] __filemap_fdatawrite_range+0x59/0x60
  Nov 16 09:26:03 nas kernel: [  230.611117]  [<ffffffff8114fb7c>] filemap_flush+0x1c/0x20
  Nov 16 09:26:03 nas kernel: [  230.611130]  [<ffffffff81240928>] ext4_alloc_da_blocks+0x38/0x70
  Nov 16 09:26:03 nas kernel: [  230.611156]  [<ffffffff81239e89>] ext4_release_file+0x79/0xc0
  Nov 16 09:26:03 nas kernel: [  230.611171]  [<ffffffff811bed84>] __fput+0xe4/0x260
  Nov 16 09:26:03 nas kernel: [  230.611184]  [<ffffffff811bef4e>] ____fput+0xe/0x10
  Nov 16 09:26:03 nas kernel: [  230.611197]  [<ffffffff81088227>] task_work_run+0xa7/0xe0
  Nov 16 09:26:03 nas kernel: [  230.611210]  [<ffffffff81013df7>] do_notify_resume+0x97/0xb0
  Nov 16 09:26:03 nas kernel: [  230.611225]  [<ffffffff8172faaa>] int_signal+0x12/0x17
  Nov 16 09:26:03 nas kernel: [  230.612259] ---[ end trace c2c7ff1f119c2b75 ]---

  ----------------------------------------------------------------------------------------

  apt-cache policy e2fslibs:amd64
  e2fslibs:
    Installed: 1.42.9-3ubuntu1
    Candidate: 1.42.9-3ubuntu1
    Version table:
   *** 1.42.9-3ubuntu1 0
          500 http://ch.archive.ubuntu.com/ubuntu/ trusty/main amd64 Packages
          100 /var/lib/dpkg/status

  ----------------------------------------------------------------------------------------

  smartctl -H /dev/sdc
  smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
  Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

  smartctl -H /dev/sdc
  smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
  Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

  === START OF READ SMART DATA SECTION ===
  SMART overall-health self-assessment test result: PASSED

   smartctl -H /dev/sdd
  smartctl 6.2 2013-07-26 r3841 [x86_64-linux-3.13.0-39-generic] (local build)
  Copyright (C) 2002-13, Bruce Allen, Christian Franke, www.smartmontools.org

  === START OF READ SMART DATA SECTION ===
  SMART overall-health self-assessment test result: PASSED

  ----------------------------------------------------------------------------------------
  /dev/md1:
          Version : 1.2
    Creation Time : Sat Nov 15 20:27:36 2014
       Raid Level : raid1
       Array Size : 5860389696 (5588.90 GiB 6001.04 GB)
    Used Dev Size : 5860389696 (5588.90 GiB 6001.04 GB)
     Raid Devices : 2
    Total Devices : 2
      Persistence : Superblock is persistent

    Intent Bitmap : Internal

      Update Time : Sun Nov 16 09:15:47 2014
            State : active
   Active Devices : 2
  Working Devices : 2
   Failed Devices : 0
    Spare Devices : 0

             Name : nas:1  (local to host nas)
             UUID : 035d6d6e:d213adb0:56b6b6d8:d0cf202c
           Events : 155

      Number   Major   Minor   RaidDevice State
         0       8       33        0      active sync   /dev/sdc1
         1       8       49        1      active sync   /dev/sdd1
  ----------------------------------------------------------------------------------------

    --- Physical volume ---
    PV Name               /dev/md1
    VG Name               vg_hdd1
    PV Size               5.46 TiB / not usable 4.81 MiB
    Allocatable           yes
    PE Size               4.00 MiB
    Total PE              1430758
    Free PE               644326
    Allocated PE          786432
    PV UUID               M0yvqu-vnTR-lNVg-nxRL-CSzK-hVCD-DDWcet

  ----------------------------------------------------------------------------------------

    --- Volume group ---
    VG Name               vg_hdd1
    System ID
    Format                lvm2
    Metadata Areas        1
    Metadata Sequence No  2
    VG Access             read/write
    VG Status             resizable
    MAX LV                0
    Cur LV                1
    Open LV               0
    Max PV                0
    Cur PV                1
    Act PV                1
    VG Size               5.46 TiB
    PE Size               4.00 MiB
    Total PE              1430758
    Alloc PE / Size       786432 / 3.00 TiB
    Free  PE / Size       644326 / 2.46 TiB
    VG UUID               MVW4e0-oeYT-RKPp-j2E9-7RT2-WBjt-Zof2Nn

  ----------------------------------------------------------------------------------------

    --- Logical volume ---
    LV Path                /dev/vg_hdd1/lv_share
    LV Name                lv_share
    VG Name                vg_hdd1
    LV UUID                VhywGd-c3kY-IXRd-SomS-ypAe-a4rg-5oQKKE
    LV Write Access        read/write
    LV Creation host, time nas, 2014-11-16 09:17:51 +0100
    LV Status              available
    # open                 0
    LV Size                3.00 TiB
    Current LE             786432
    Segments               1
    Allocation             inherit
    Read ahead sectors     auto
    - currently set to     256
    Block device           252:4

  ----------------------------------------------------------------------------------------

  lshw -short
  H/W path       Device     Class          Description
  ====================================================
                            system         H97N-WIFI (To be filled by O.E.M.)
  /0                        bus            H97N-WIFI
  /0/0                      memory         64KiB BIOS
  /0/3d                     processor      Intel(R) Core(TM) i3-4160 CPU @ 3.60GHz
  /0/3d/3e                  memory         128KiB L1 cache
  /0/3d/3f                  memory         512KiB L2 cache
  /0/3d/40                  memory         3MiB L3 cache
  /0/42                     memory         8GiB System Memory
  /0/42/0                   memory         4GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
  /0/42/1                   memory         DIMM [empty]
  /0/42/2                   memory         4GiB DIMM DDR3 Synchronous 1600 MHz (0.6 ns)
  /0/42/3                   memory         DIMM [empty]
  /0/100                    bridge         4th Gen Core Processor DRAM Controller
  /0/100/2                  display        Intel Corporation
  /0/100/3                  multimedia     Xeon E3-1200 v3/4th Gen Core Processor HD Audio Controller
  /0/100/14                 bus            Intel Corporation
  /0/100/16                 communication  Intel Corporation
  /0/100/19      eth1       network        Ethernet Connection I217-V
  /0/100/1a                 bus            Intel Corporation
  /0/100/1b                 multimedia     Intel Corporation
  /0/100/1c                 bridge         Intel Corporation
  /0/100/1c.3               bridge         Intel Corporation
  /0/100/1c.3/0  eth0       network        AR8161 Gigabit Ethernet
  /0/100/1c.4               bridge         Intel Corporation
  /0/100/1c.4/0  wlan0      network        Wireless 7260
  /0/100/1d                 bus            Intel Corporation
  /0/100/1f                 bridge         Intel Corporation
  /0/100/1f.2               storage        Intel Corporation
  /0/100/1f.3               bus            Intel Corporation
  /0/1           scsi1      storage
  /0/1/0.0.0     /dev/sda   disk           120GB INTEL SSDSC2CT12
  /0/1/0.0.0/1   /dev/sda1  volume         510MiB Windows FAT volume
  /0/1/0.0.0/2   /dev/sda2  volume         111GiB RAID partition
  /0/2           scsi3      storage
  /0/2/0.0.0     /dev/sdb   disk           120GB INTEL SSDSC2CT12
  /0/2/0.0.0/1   /dev/sdb1  volume         510MiB Windows FAT volume
  /0/2/0.0.0/2   /dev/sdb2  volume         111GiB RAID partition
  /0/3           scsi4      storage
  /0/3/0.0.0     /dev/sdc   disk           6001GB WDC WD60EFRX-68M
  /0/3/0.0.0/1   /dev/sdc1  volume         5589GiB RAID partition
  /0/4           scsi5      storage
  /0/4/0.0.0     /dev/sdd   disk           6001GB WDC WD60EFRX-68M
  /0/4/0.0.0/1   /dev/sdd1  volume         5589GiB RAID partition
  /1                        power          To Be Filled By O.E.M.

  ----------------------------------------------------------------------------------------

  Linux nas 3.13.0-39-generic #66-Ubuntu SMP Tue Oct 28 13:30:27 UTC
  2014 x86_64 x86_64 x86_64 GNU/Linux

  Description:	Ubuntu 14.04.1 LTS
  Release:	14.04

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Follow ups

References