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[Brad Figg <brad.figg@xxxxxxxxxxxxx>]

This bug is missing log files that will aid in diagnosing the problem.
>From a terminal window please run:

apport-collect 1398859

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable
to run this command, please add a comment stating that fact and change
the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the
Ubuntu Kernel Team.

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

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https://bugs.launchpad.net/bugs/1398859

Title:
  unmounting NTFS causes mount.ntfs process to get stuck in eternal
  kernel deep sleep

Status in linux package in Ubuntu:
  Incomplete
Status in udisks2 package in Ubuntu:
  Fix Released

Bug description:
  Since Mid-November the udisks2 test (https://jenkins.qa.ubuntu.com/job
  /vivid-adt-udisks2/? shows it happened between Nov 13 and 19) exhibits
  a regression with NTFS: Unmounting causes the ntfs-3g process to go
  into kernel deep sleep and umount hangs forever.

  This can be reproduced with

    sudo apt install ntfs-3g
    sudo modprobe scsi_debug
    # check dmesg which drive this created; e. g. /dev/sda
    sudo mkntfs -F /dev/sda
    sudo mount /dev/sda /mnt

  Now you have a process which is happy:
  root     12821  0.0  0.0  15272  1948 ?        Ss   15:49   0:00 /sbin/mount.ntfs /dev/sda /mnt -o rw

  You can work with /mnt, edit files, etc. But now unmount:

    sudo umount /mnt

  This never returns, and  the process goes into uninterruptible kernel
  sleep ("D"):

  root     12928  0.0  0.0  15272  1948 ?        Ds   15:55   0:00
  /sbin/mount.ntfs /dev/sda /mnt -o rw

  The strace for the umount until the hang is

  ubuntu@autopkgtest:~$ sudo strace -vvtts1024 -p 12928
  Process 12928 attached
  15:56:17.938299 read(4, "0\0\0\0\2\0\0\0\2\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\1\0\0\0\0\0\0\0", 135168) = 48
  15:56:22.338931 read(4, "(\0\0\0&\0\0\0\3\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0", 135168) = 40
  15:56:22.339637 sendto(5, "<29>Dec  3 15:56:22 ntfs-3g[12928]: Unmounting /dev/sda ()\n", 59, MSG_NOSIGNAL, NULL, 0) = 59
  15:56:22.340509 fsync(3)                = 0
  15:56:22.341188 fcntl(3, F_SETLK, {type=F_UNLCK, whence=SEEK_SET, start=0, len=0}) = 0
  15:56:22.341759 close(3

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: ntfs-3g 1:2013.1.13AR.1-2ubuntu3
  ProcVersionSignature: Ubuntu 3.16.0-25.33-generic 3.16.7
  Uname: Linux 3.16.0-25-generic x86_64
  ApportVersion: 2.15-0ubuntu1
  Architecture: amd64
  CurrentDesktop: Unity
  Date: Wed Dec  3 15:48:12 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-11-20 (13 days ago)
  InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Alpha amd64 (20141119)
  SourcePackage: ntfs-3g
  UpgradeStatus: No upgrade log present (probably fresh install)

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