kernel-packages team mailing list archive

[Lenz Grimmer <lenz@xxxxxxxxxxx>]

FYI, I'm now running Kernel version 3.19.0-031900rc6-generic from the
URL you mentioned in #4. Let's see if the issue persists.

The file system mounts fine, but I'm concerned about the output of
btrfsck:

Checking filesystem on /dev/mapper/ubuntu--vg-container
UUID: b95b58fb-d0b2-4735-a4ed-2033537eb89a
checking extents
checking free space cache
free space inode generation (0) did not match free space cache generation (135494)
free space inode generation (0) did not match free space cache generation (135494)
There is no free space entry for 11902451712-11904450560
There is no free space entry for 11902451712-12914262016
cache appears valid but isnt 11840520192
There is no free space entry for 14083878912-14084898816
There is no free space entry for 14083878912-15061745664
cache appears valid but isnt 13988003840
There is no free space entry for 15305744384-15306821632
There is no free space entry for 15305744384-16135487488
cache appears valid but isnt 15061745664
There is no free space entry for 16377102336-16378097664
There is no free space entry for 16377102336-17209229312
cache appears valid but isnt 16135487488
Wanted bytes 1957888, found 393216 for off 17210597376
Wanted bytes 1072373760, found 393216 for off 17210597376
cache appears valid but isnt 17209229312
There is no free space entry for 22839361536-22840332288
There is no free space entry for 22839361536-23651680256
cache appears valid but isnt 22577938432
There is no free space entry for 27126554624-27128291328
There is no free space entry for 27126554624-27946647552
cache appears valid but isnt 26872905728
There is no free space entry for 27985326080-27987566592
There is no free space entry for 27985326080-29020389376
cache appears valid but isnt 27946647552
There is no free space entry for 30126866432-30127960064
There is no free space entry for 30126866432-31167873024
cache appears valid but isnt 30094131200
Wanted bytes 2195456, found 12288 for off 64471998464
Wanted bytes 1055612928, found 12288 for off 64471998464
cache appears valid but isnt 64453869568
There is no free space entry for 65631424512-65632366592
There is no free space entry for 65631424512-66601353216
cache appears valid but isnt 65527611392
free space inode generation (0) did not match free space cache generation (135494)
found 15376998613 bytes used err is -22
total csum bytes: 44021104
total tree bytes: 601505792
total fs tree bytes: 419954688
total extent tree bytes: 103333888
btree space waste bytes: 129058353
file data blocks allocated: 126222901248
 referenced 43301400576
Btrfs v3.12

I'm not sure if the corruption is the cause or the consequence of the
kernel panics, which require a hard reboot.

-- 
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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1415510

Title:
  Frequent kernel panics when doing heavy I/O in LXC containers on Btrfs

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  I initially reported this as a bug in LXC
  (https://github.com/lxc/lxc/issues/424), but I was (rightfully)
  advised to report this as a kernel issue instead:

  I'm running Ubuntu 14.04.1 LTS (x86_64) on my Laptop. Current Kernel
  version is "3.13.0-44-generic". The LXC version is "1.0.7-0ubuntu0.1",
  installed from the "ubuntu-lxc" PPA on Launchpad.

  I have a dedicated Btrfs file system mounted on /container/, which I
  use for storing all LXC containers.

  The file system is created on top of a logical volume:

  lenz@lenz-ThinkPad-T440 ~ % mount | grep container
  /dev/mapper/ubuntu--vg-container on /container type btrfs (rw)
  lenz@lenz-ThinkPad-T440 ~ % sudo lvdisplay /dev/mapper/ubuntu--vg-container
    --- Logical volume ---
    LV Path                /dev/ubuntu-vg/container
    LV Name                container
    VG Name                ubuntu-vg
    LV UUID                JUq21P-SSoS-UeU5-rdDS-k6V4-d30e-gJM1FA
    LV Write Access        read/write
    LV Creation host, time lenz-ThinkPad-T440, 2014-09-15 13:42:27 +0200
    LV Status              available
    # open                 1
    LV Size                65,00 GiB
    Current LE             16640
    Segments               1
    Allocation             inherit
    Read ahead sectors     auto
    - currently set to     256
    Block device           252:5

  The hard disk drive is a Samsung SSD ("Samsung SSD 840 EVO 500GB,
  EXT0BB0Q, max UDMA/133", according to dmesg).

  I have a number containers based on CentOS 6, these were created by
  cloning a base image using lxc-clone -s.

  Quite frequently, when I create heavy disk I/O in one or several of
  these containers (e.g. by running yum update concurrently, or by
  transferring large files e.g. via a HTTP upload to one of the
  container instances), my host system freezes. This only happens when
  container activity is involved, the system runs stable otherwise. Most
  of the time the X desktop freezes, sometimes a Kernel panic can be
  observed on the console. Unfortunately I'm unable to capture it other
  than by taking a picture. The only solution is to perform a cold
  reboot using the power button.

  This occurred to me before. I then re-created the /container/ file
  system from scratch and started again. But now it's happening again,
  so I would like to report it for investigation.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-generic 3.13.0.44.51
  ProcVersionSignature: Ubuntu 3.13.0-44.73-generic 3.13.11-ckt12
  Uname: Linux 3.13.0-44-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  lenz       2782 F.... pulseaudio
   /dev/snd/controlC0:  lenz       2782 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Wed Jan 28 16:16:20 2015
  HibernationDevice: RESUME=UUID=a60307c3-e53f-473e-ba9e-90cbfe484bb8
  InstallationDate: Installed on 2014-09-15 (135 days ago)
  InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
  MachineType: LENOVO 20B6005YGE
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.13.0-44-generic root=/dev/mapper/ubuntu--vg-root ro softlockup_panic=1 elevator=noop quiet splash nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-44-generic N/A
   linux-backports-modules-3.13.0-44-generic  N/A
   linux-firmware                             1.127.11
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 09/03/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET79WW (2.29 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20B6005YGE
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 PRO
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET79WW(2.29):bd09/03/2014:svnLENOVO:pn20B6005YGE:pvrThinkPadT440:rvnLENOVO:rn20B6005YGE:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20B6005YGE
  dmi.product.version: ThinkPad T440
  dmi.sys.vendor: LENOVO

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