[Bug 1336184] [NEW] USB flash drive (NTFS) keeps writing for quite a while even after "Eject" completes

[Launchpad Bug Tracker]

You have been subscribed to a public bug:

Release: Ubuntu 14.04

Nautilus version: 1:3.10.1-0ubuntu9.1

Expected: After pressing "Eject" on a flash drive (formatted with NTFS
-- haven't tried with FAT yet) I expected it to return only after
flushing and unmounting the drive so the drive is completely safe to
remove at that point

What happened: "Eject" returned after a short while. The drive still
kept writing for a long time. Mount shows the drive still mounted for
the period while the flash drive keeps blinking though "df" does not
show the drive anymore. Removing the drive at this point results in
partial file write and NTFS filesystem damage (fixable with ntfsfix but
dangerous).

Steps to reproduce:

1) Insert a flash drive (tried with NTFS mounted drive though I believe
FAT will show similar behaviour though latter uses "flush" mount option
so may not be that prominent)

2) Try copying a large file. For testing use a size that will also mostly fit into filesystem cache so that real wait for writing is during unmount: dd if=/dev/zero of=/media/<user>/<drive>/test.out bs=1M count=1000
<user> is the user name and <drive> the name where drive was mounted by nautilus as per the label.

3) "Eject" the drive from nautilus context menu after dd command above
returns.

4) Eject returns shortly. However drive is still writing as seen by the
blinking, or disk throughput in gkrellm, iostat. Also note that "mount"
still shows the drive as mounted though "df" and other tools don't.

I have confirmed the same issue exists on all similar file managers
namely nemo and caja. Haven't filed bugs against those yet.

For comparison, the gnome-disks system utility correctly unmounts,
ejects and stops the drive (last one even powers down the drive so the
LED on drive is switched off which one would expect nautilus "Eject" to
also do) so it doesn't seem to be a bug in udisks2.

** Affects: fuse (Ubuntu)
     Importance: Undecided
         Status: Confirmed


** Tags: trusty
-- 
USB flash drive (NTFS) keeps writing for quite a while even after "Eject" completes
https://bugs.launchpad.net/bugs/1336184
You received this bug notification because you are a member of Ubuntu Foundations Bugs, which is subscribed to fuse in Ubuntu.