[Bug 237892] x11-fm/rox-filer: overwriting a file on an USB drive truncates it

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237892

            Bug ID: 237892
           Summary: x11-fm/rox-filer: overwriting a file on an USB drive
                    truncates it
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: Individual Port(s)
          Assignee: olgeni at FreeBSD.org
          Reporter: markus.hoenicka at mhoenicka.de
          Assignee: olgeni at FreeBSD.org
             Flags: maintainer-feedback?(olgeni at FreeBSD.org)

FreeBSD wombat 11.2-RELEASE-p4 FreeBSD 11.2-RELEASE-p4 #0: Thu Sep 27 08:16:24
UTC 2018     root at amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC 
amd64

Short description: drag&drop a file from a rox-filer window showing the hard
drive to a rox-filer window showing an USB drive. If the file already exists on
the target drive, it will be truncated. Expected behaviour: The existing file
on the USB drive should be overwritten.

Long description:
After logging in, I start an Xfce session manually:

startxfce4 --with-ck-launch

mount stick in an xterm, as per handbook. Note that I've set up user mounting
of USB drives:

mount -t msdosfs -o -m=644,-M=755 /dev/da0s1 /stick/username

open source directory (on hard drive) in a ROX-Filer window
open target directory (on usb drive) in another ROX-Filer window

drag&drop a file from source over an existing copy of that file on target

dialog box asks if it is ok to overwrite which I agree to

ROX-Filer window shows the expected file size immediately after copying, and
after rescanning the directory. ls -al /stick/markus/targetdir also shows the
expected file size at this point.

umount /stick/markus. fstat shows that the ROX-Filer process keeps the mounted
directory busy, so I need to close all ROX-Filer windows first or kill the
process in order to umount cleanly without -f.

then mount the stick again as above, or try on a different computer

ls -al /stick/username/targetdir shows a target file size of zero.

Expected behaviour: the target file should be overwritten. If the stick is
unmounted properly, pending data should be flushed, and no data should be lost.
Ever.

Additional information:
ROX-Filer works correctly on a Debian Linux box, so it might be no ROX-Filer
bug per se. Also, I cannot recall having this problem before I updated to
FreeBSD 11.2. Target files are not truncated if I use Thunar or cp to overwrite
existing files on the USB drive.

Any help is appreciated.

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