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[Martin Pitt <martin.pitt@xxxxxxxxxx>]

So this is interesting. Debian's /lib/systemd/systemd works, but the
hang happens under upstart too (where that binary isn't being used!). So
it must be something which we change in Ubuntu's systemd, but
conceptually also do for upstart/cgmanager. The first candidate that I
see is to put processes into all cgroups for session LXC, I'll verify
that.

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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 systemd package in Ubuntu:
  Triaged

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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