Discovered cause of "I/O Error" notificiation bug.

[anony531]

qBittorrent version and Operating System:

v3.3.10 / Arch Linux
Note: this is not a version-specific bug. I have had it on multiple versions in the past.

If on linux, libtorrent and Qt version:

libtorrent: 1.1.1.0 / Qt: 5.7.1

What is the problem:

Repeated "I/O Error" notifications.
http://i.imgur.com/6vKGZk0.png
http://i.imgur.com/y63qyb6.jpg

What is the expected behavior:

No "I/O Error" messages.

Steps to reproduce:

Okay, so I've had this bug a few times and I always thought it was related to the amount of torrents I had running, but I'm pretty certain I've discovered the true cause.

1. Add a torrent to your client and start downloading it.
2. Part way through the download, open the "Content" tab and uncheck a partially downloaded item.

That's it. Do that and you should start getting flooded with notifications before long about I/O errors. That said, I haven't tested this much so it might only happen with certain torrents for unknown reasons.

If you can't reproduce the bug by unchecking a file, try unchecking a folder instead.

Extra info(if any):

To get the error messages to go away, all one has to do is manually delete the partially downloaded file/folder and they will stop.

It seems like this bug would be fairly easy to fix by simply telling qBittorrent to remove unchecked files from the hard drive, but I don't think that would be the best solution since if somebody accidentally unchecked a very large file it would mean re-downloading hours or possibly even days worth of data (depending how well-seeded the torrent in question is).

[fshp]

Confirmed

[surfernsk]

@anony531 try build qbt with libtorrent: 1.0.10 or 1.0.11
qbt 3.3.10 no official support libtorrent: 1.1.0 and higher

[kozmaz87]

I am actually getting the I/O error whenever everything is selected for download and the torrent is say tens of gigabytes of files with long names averaging around 500MB :) each. The only thing I did to it is change priority of some files to Maximum. And that already started throwing me the error...

One addition I have not specifically seen... in win10 no error. That just works. This only happens on my win7 computer.

[ngosang]

We are closing all issues related to old qBittorrent versions (qBittorrent < 4.1.0).
Please, update to last release and, if the bug/error/crash is still present, open another issue.
Thank you.