hard disk management @torrent_check @disk_io_thread (crash)

[YV]

File is placed at /dev/sdb2 ext4, maxtor onetouch IV. USB connected.

bash-v4.1.7(2)$ vlc Inc/Rim.S02.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO/Rim.S02E03.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO.avi :sub-file=Inc/Rim.S02.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO/Subtitry\ \(RUS\,\ ENG\)/Rim.S02E03.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO_rus1.srt :subsdec-align=0 :freetype-rel-fontsie=16 :input-slave=Inc/Rim.S02.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO/Englisn\ AC3\ 5.1\ 384\ kbps/Rim.S02E03.2007.RUS.BDRip.XviD.AC3.-HQ-ViDEO_eng.ac3 &
[5] 11178
bash-v4.1.7(2)$ VLC media player 1.1.5 The Luggage (revision exported)
Blocked: call to unsetenv("DBUS_ACTIVATION_ADDRESS")
Blocked: call to unsetenv("DBUS_ACTIVATION_BUS_TYPE")
[0x605120] main libvlc: Running vlc with the default interface. Use 'cvlc' to use vlc without interface.
Blocked: call to setlocale(6, "")
Blocked: call to sigaction(17, 0x7f90735b7b70, 0x7f90735b7ad0)
Blocked: call to setlocale(6, "")
[0x8b2640] qt4 interface error: Unable to load extensions module
/usr/bin/xdg-screensaver: line 542: dcop: command not found
No accelerated IMDCT transform found
No accelerated IMDCT transform found

*************************************************************
Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
qBittorrent version: v2.4.10
stack trace:
  /lib/libc.so.6 : ()+0x32250 [0x7f24a9897250]
  qbittorrent : boost::filesystem::basic_path<std::string, boost::filesystem::path_traits>::operator/=(char const*)+0x10 [0x49b8f0]
  /usr/lib/libtorrent-rasterbar.so.5 : boost::filesystem::basic_path<std::string, boost::filesystem::path_traits> boost::filesystem::operator/<std::string, boost::filesystem::path_traits>(boost::filesystem::basic_path<std::string, boost::filesystem::path_traits> const&, boost::filesystem::basic_path<std::string, boost::filesystem::path_traits> const&)+0x2d [0x7f24ac0697dd]
  /usr/lib/libtorrent-rasterbar.so.5 : libtorrent::storage::read_impl(char*, int, int, int, bool)+0xa8 [0x7f24ac0619f8]
  /usr/lib/libtorrent-rasterbar.so.5 : libtorrent::piece_manager::check_one_piece(int&)+0x8e [0x7f24ac06074e]
  /usr/lib/libtorrent-rasterbar.so.5 : libtorrent::piece_manager::check_files(int&, int&, std::string&)+0x62 [0x7f24ac064d12]
  /usr/lib/libtorrent-rasterbar.so.5 : libtorrent::disk_io_thread::operator()()+0xa2c [0x7f24ac148d8c]
  /usr/lib/libboost_thread-mt-1_41.so.1.41.0 : thread_proxy()+0x76 [0x7f24a302cb46]
  //usr/lib64/opengl/nvidia/lib/libGL.so.1 : ()+0x99a33 [0x7f24a4da8a33]

Possibly related to Maxtor OneTouch IV behaviour: controller is switching disk off, when disk is not operating.
Such a switching during torrent_check (how is it possible?) could lead to major system down.

Is it related to bugged hard disk io port?

[Christophe Dumez (hydr0g3n)]

qBittorrent is a GUI for libtorrent. As such, qBittorrnet is not handling disk IO itself.
You will have better luck asking about this there: http://code.google.com/p/libtorrent/issues/entry