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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)

** Affects: systemd (Ubuntu)
     Importance: Undecided
     Assignee: Martin Pitt (pitti)
         Status: Triaged


** Tags: amd64 apport-bug vivid
-- 
[regression] unmounting NTFS causes mount.ntfs process to get stuck in eternal kernel deep sleep
https://bugs.launchpad.net/bugs/1398859
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