Sebastien, I was able to reproduce this just like Andree said. After
copying several large files, Nautilus keeps writing them in background
and displays the reported message when the user tries to eject, long
after the progress dialog has closed:

$ while true; do date; df -m /media/ariel/Samsung\ USB/_fun/ | sed 1d; sleep 
30; done
Mon Jul 11 08:36:49 VET 2016
/dev/sde1          15280 10629      4652  70% /media/ariel/Samsung USB
Mon Jul 11 08:37:19 VET 2016
/dev/sde1          15280 11215      4066  74% /media/ariel/Samsung USB
Mon Jul 11 08:37:49 VET 2016
/dev/sde1          15280 11667      3614  77% /media/ariel/Samsung USB
Mon Jul 11 08:38:19 VET 2016
/dev/sde1          15280 12045      3236  79% /media/ariel/Samsung USB
Mon Jul 11 08:38:49 VET 2016
/dev/sde1          15280 12467      2814  82% /media/ariel/Samsung USB
Mon Jul 11 08:39:19 VET 2016
/dev/sde1          15280 12884      2397  85% /media/ariel/Samsung USB
Mon Jul 11 08:39:49 VET 2016
/dev/sde1          15280 13164      2117  87% /media/ariel/Samsung USB
Mon Jul 11 08:40:19 VET 2016
/dev/sde1          15280 13164      2117  87% /media/ariel/Samsung USB
Mon Jul 11 08:40:49 VET 2016
/dev/sde1          15280 13164      2117  87% /media/ariel/Samsung USB


$ lsof +D /media/ariel/Samsung\ USB/
lsof: WARNING: can't stat() tracefs file system /sys/kernel/debug/tracing
      Output information may be incomplete.
COMMAND   PID  USER   FD   TYPE DEVICE   SIZE/OFF NODE NAME
nautilus 1667 ariel   56w   REG   8,65 2419224576 1467 /media/ariel/Samsung 
USB/_fun/Evangelion Rebuild/Evangelion 3.33 - You Can (Not) Redo.mp4


My Nautilus version is 3.14.2-0ubuntu13 (Wily).

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Packages, which is subscribed to nautilus in Ubuntu.
https://bugs.launchpad.net/bugs/562188

Title:
  Cannot unmount USB flash drive because volume is busy

Status in nautilus package in Ubuntu:
  Invalid

Bug description:
  Binary package hint: nautilus

  When I select Eject or Safely Remove Drive from the context menu of a
  mounted USB flash drive, Nautilus says "One or more applications are
  keeping the volume busy". The only listed application in the presented
  list is Nautilus itself (at the root folder).

  lsof | grep media/1CAC-FFC3 says:

  "nautilus  2059     oswald   40u      REG       8,33        0
  380 /media/1CAC-FFC3/.Trash-1000/info/[FILENAME].trashinfo.2NYEBV
  (deleted)"

  where [FILENAME] is the name of a file that I have moved to Trash (the
  Trash is now empty).

  ls  /media/1CAC-FFC3/.Trash-1000/info/[FILENAME].trashinfo.2NYEBV says:
  "ls: cannot access 
/media/1CAC-FFC3/.Trash-1000/info/[FILENAME].trashinfo.2NYEBV: No such file or 
directory"

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: nautilus 1:2.30.0-0ubuntu4
  ProcVersionSignature: Ubuntu 2.6.32-20.30-generic 2.6.32.11+drm33.2
  Uname: Linux 2.6.32-20-generic i686
  Architecture: i386
  CheckboxSubmission: d115afe81cf230a63da4717ba6cce4f2
  CheckboxSystem: 331fbefb4b1f6727f4a8261fee7507c9
  Date: Tue Apr 13 12:26:49 2010
  ExecutablePath: /usr/bin/nautilus
  InstallationMedia: Ubuntu 10.04 "Lucid Lynx" - Beta i386 (20100318)
  ProcEnviron:
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: nautilus
  XsessionErrors: (polkit-gnome-authentication-agent-1:2057): GLib-CRITICAL **: 
g_once_init_leave: assertion `initialization_value != 0' failed

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