transmission gets stuck deleting torrent data directories

[hello_world.c]

I am running version 2.82 (14160) on Debian Wheezy. The daemon runs as the debian-transmission user. Download directory is on a remote NFS share. Downloading works just fine, but when I try to delete a torrent that includes a directory from the web interface with data, the daemon gets stuck and I have to terminate it. In the download directory, this is what I see in this state:

Let's assume the download directory is "downloaddir" and the torrent directory which had all torrent files is "torrentdir":

- downloaddir/torrentdir/ still exists but is now empty. Since umask is 0 in settings.json, the permission on this directory is 777, of the files originally in it 666
- there is a new downloaddir/torrentdir__abcDEF directory where "abcDEF" seems to be a random combination of upper and lower case characters
- this new directory has the permissions set to 700
- the original torrent directory and all files are in downloaddir/torrentdir_abcDEF/torrentdir/

As user debian-transmission, I can manually delete the new, extra directory as well as the original one so transmission should have all needed rights here, but something goes wrong.

How exactly does transmission delete torrent data directories, and what could prevent it from completing it when the user transmission runs at has the necessary permissions?

[hello_world.c]

While I still don't know what transmission does exactly I could solve the problem by changing my nfs mount options. I used the ones mentioned as "transmission friendly" here: https://trac.transmissionbt.com/ticket/5540

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