I/O errors with qbt 2.9.0 on Windows

[sledgehammer999]

Some users report I/O errors with the new 2.9.0 version on Windows.
The IO errors don't appear on every torrent. Also they seem to occur when a torrent is being downloaded.
The error reported is "The parameter is incorrect" (from user ironcross) and "Reached the end of file." (from me)

The users shared some torrents files with me that produce these errors. The IO error seems to be triggered almost instanteneously when the first KBs are to be written to disk.

I changed the disk_io_write_mode to disable_os_cache_for_aligned_files and the errors where gone for me and one other user. But for the other user(ironcross who got a different description) the errors continue . Also they appear to other torrents that were unaffected by the previous setting. This user is using Windows 7 32bit.

I'll attach 2 sample torrents that produce the error for me.
Also I am going to be quite busy this week so don't assign the bug to me.

[Christophe Dumez (hydr0g3n)]

This should be reported against libtorrent ASAP.

[Christophe Dumez (hydr0g3n)]

Known libtorrent bug apparently, please provide more information via the libtorrent tracker (report link attached)

[Christophe Dumez (hydr0g3n)]

Maybe we should just enable the os cache again until the bug is fixed in libtorrent for sure? It is better to avoid memory issues on torrent force recheck than I/O errors preventing users from downloading torrent IMHO... :(

[sledgehammer999 (sledgehammer-999)]

ok. I agree with you. I'll upload a 2.9.0.1 version shortly.

[sledgehammer999 (sledgehammer-999)]

one question. Should I use "enable_os_cache" or "disable_os_cache_for_aligned_files" in read/write_mode?

[Christophe Dumez (hydr0g3n)]

Enable os cache in both modes for now
On Oct 9, 2011 7:30 PM, "Sledgehammer_999" <email address hidden>
wrote:

> one question. Should I use "enable_os_cache" or
> "disable_os_cache_for_aligned_files" in read/write_mode?
>
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> Title:
> I/O errors with qbt 2.9.0 on Windows
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[sledgehammer999 (sledgehammer-999)]

qbt 2.9.0.1 is up on qbittorrent-win32 with enable_os_cache

[loki (loki8428)]

It seems to have solved the I/O error for me too, at least for now. (Reached end of file)
On windows 7 64-bit. Were you saying I can't do force recheck due to memory leak problem?

[sledgehammer999 (sledgehammer-999)]

Try it. Technically it isn't a leak. It is Windows' (OS) cache not being smart enough. It keeps the data around although it shouldn't.

I am not sure, but the RAM usage will grow until some point(pretty close to 100%), but Windows will start dropping earlier data so it won't grow past that point. Other programs will suffer though and you'll experience disk/RAM swapping.

Here is the relevant bug report: https://bugs.launchpad.net/qbittorrent/+bug/841138

[Cas (calumlind)]

FYI "The parameter is incorrect" issue has now been fixed in libtorrent 0.15.10.