qBT crashes on startup [v2.1.1]

[0xdb]

db@mysrv:~$ qbittorrent
Peer ID: -qB2110-
HTTP user agent is qBittorrent v2.1.1

*************************************************************
Catching SIGSEGV, please report a bug at http://bug.qbittorrent.org
and provide the following backtrace:
stack trace:
  [0xb7fd7400]
  qbittorrent : FeedList::getItemType(QTreeWidgetItem*) const+0x1e [0x81f03be]
  qbittorrent : FeedList::qt_metacall(QMetaObject::Call, int, void**)+0xc0 [0x81f00a0]
  /usr/lib/libQtCore.so.4 : QMetaObject::activate(QObject*, int, int, void**)+0x200 [0xb71b3bd0]
  /usr/lib/libQtCore.so.4 : QMetaObject::activate(QObject*, QMetaObject const*, int, void**)+0x52 [0xb71b4952]
  /usr/lib/libQtGui.so.4 : QTreeWidget::currentItemChanged(QTreeWidgetItem*, QTreeWidgetItem*)+0x49 [0xb79f57d9]
  /usr/lib/libQtGui.so.4 [0xb79fe635]
  /usr/lib/libQtGui.so.4 : QTreeWidget::qt_metacall(QMetaObject::Call, int, void**)+0x299 [0xb7a02369]
  qbittorrent : FeedList::qt_metacall(QMetaObject::Call, int, void**)+0x2f [0x81f000f]
  /usr/lib/libQtCore.so.4 : QMetaObject::activate(QObject*, int, int, void**)+0x200 [0xb71b3bd0]
  /usr/lib/libQtCore.so.4 : QMetaObject::activate(QObject*, QMetaObject const*, int, void**)+0x52 [0xb71b4952]
  /usr/lib/libQtGui.so.4 : QItemSelectionModel::currentChanged(QModelIndex const&, QModelIndex const&)+0x49 [0xb79d2b99]
  /usr/lib/libQtGui.so.4 : QItemSelectionModel::setCurrentIndex(QModelIndex const&, QFlags<QItemSelectionModel::SelectionFlag>)+0x8d [0xb79d2d3d]
  /usr/lib/libQtGui.so.4 : QAbstractItemView::setCurrentIndex(QModelIndex const&)+0x76 [0xb7985426]
  /usr/lib/libQtGui.so.4 : QTreeWidget::setCurrentItem(QTreeWidgetItem*, int)+0x69 [0xb79ffcd9]
  /usr/lib/libQtGui.so.4 : QTreeWidget::setCurrentItem(QTreeWidgetItem*)+0x2c [0xb79ffd1c]
  qbittorrent : FeedList::FeedList(QWidget*, RssManager*)+0x442 [0x818d682]
  qbittorrent : RSSImp::RSSImp(Bittorrent*)+0x8d [0x81842dd]
  qbittorrent : GUI::displayRSSTab(bool)+0x69 [0x8110179]
  qbittorrent : GUI::loadPreferences(bool)+0xc83 [0x8118a03]
  qbittorrent : GUI::GUI(QWidget*, QStringList)+0xee7 [0x811a527]
  qbittorrent : main()+0x13f7 [0x80974e7]
  /lib/i686/cmov/libc.so.6 : __libc_start_main()+0xe5 [0xb6df2455]
  qbittorrent : QCleanlooksStyle::drawPrimitive(QStyle::PrimitiveElement, QStyleOption const*, QPainter*, QWidget const*) const+0x25d [0x8095751]
Aborted

enclosed you will find configure output:

mysrv:~/build/qbittorrent-2.1.1# ./configure --prefix=/usr
Configuring qbittorrent ...
Verifying Qt 4 build environment ... ok
Checking for Qt >= 4.4 ... yes
Checking for pkg-config executable ... yes
Checking for libtorrent-rasterbar >= 0.14.4 ...
Warning: libtorrent-rasterbar v0.14.8 was detected. Some feature will be disabled because they require v0.15.0.
 yes
Checking for libboost ... yes
Checking for libnotify >= 0.4.2 (optional) ... no
Checking for GeoIP Database (optional) ... yes

Good, your configure finished. Now run /usr/bin/make.

[Christophe Dumez (hydr0g3n)]

Since you compiled manually, could you please enable debug?
Switch to "DEBUG=1" in src/src.pro
then recompile:
./configure --prefix=/usr && make clean && make && sudo make install

Then, you can get a better backtrace using gdb:
$ gdb qbittorrent
> run
... Wait for it to crash ...
> bt 25
... This will print a backtrace with line numbers that is very useful to me ...

Thanks in advance.

[0xdb (belov-gmx)]

qBT runs with debug mode enabled (no crash on startup).

(gdb) run
Starting program: /usr/bin/qbittorrent
[Thread debugging using libthread_db enabled]
[New Thread 0xb67866c0 (LWP 25364)]
en_GB locale recognized, using translation.
[New Thread 0xb643bb90 (LWP 25374)]
[New Thread 0xb5c3ab90 (LWP 25375)]
Peer ID: -qB2110-
Configuring session
LISTEN PORT: 0
Setting a global download rate limit at -1
set upload_limit to 50.000000kb/s
Loading country resolution settings
in country reoslution settings
Loading geoip database
Loading GeoIP database from /usr/share/GeoIP/GeoIP.dat...
Enabling UPnP
Enabling NAT-PMP
HTTP user agent is qBittorrent v2.1.1
Set session settings
[New Thread 0xb5439b90 (LWP 25376)]
DHT enabled
Enabling LSD
Applying encryption settings
Disabling IPFilter
Set Peer Proxy settings
HTTP Communications proxy type: -1
Disabling HTTP communications proxy
Session configured
* BTSession constructed
...
-----------------> Ok, qBT runs

But it crashes permanently on exit now:
-----------------> Exit in GUI
GUI destruction
Bittorrent session async deletion IN
DHT entry saved
Saving session state to disk...
Bittorrent session async deletion OUT
Sizes: 2
Saving columns width in transfer list
Download list columns width saved
Deleting RSSImp...

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb67866c0 (LWP 25364)]
0xb6d5a7e2 in free () from /lib/i686/cmov/libc.so.6
(gdb)
(gdb) bt 25
#0 0xb6d5a7e2 in free () from /lib/i686/cmov/libc.so.6
#1 0xb6fb7d9d in qFree () from /usr/lib/libQtCore.so.4
#2 0xb70c3c47 in QObject::~QObject () from /usr/lib/libQtCore.so.4
#3 0xb70a3b8e in QAbstractItemModel::~QAbstractItemModel () from /usr/lib/libQtCore.so.4
#4 0xb7905d2f in ?? () from /usr/lib/libQtGui.so.4
#5 0xb70bb26f in QObjectPrivate::deleteChildren () from /usr/lib/libQtCore.so.4
#6 0xb7425788 in QWidget::~QWidget () from /usr/lib/libQtGui.so.4
#7 0xb7757fb1 in QFrame::~QFrame () from /usr/lib/libQtGui.so.4
#8 0xb77ee53d in QAbstractScrollArea::~QAbstractScrollArea () from /usr/lib/libQtGui.so.4
#9 0xb788cd51 in QAbstractItemView::~QAbstractItemView () from /usr/lib/libQtGui.so.4
#10 0xb78c70d1 in QTreeView::~QTreeView () from /usr/lib/libQtGui.so.4
#11 0xb7903ef1 in QTreeWidget::~QTreeWidget () from /usr/lib/libQtGui.so.4
#12 0x0827347a in ~FeedList (this=0x8f31190) at feedList.h:41
#13 0x081ef808 in ~RSSImp (this=0x8f06d90) at rss_imp.cpp:619
#14 0x08173e0b in ~GUI (this=0x8df5cf8) at GUI.cpp:223
#15 0x080e5e57 in main (argc=1, argv=0xbf8af404) at main.cpp:340

[Christophe Dumez (hydr0g3n)]

Strange. Could you try this patch?

[0xdb (belov-gmx)]

Well, I tested with patch applied.
It don't fix the problem.

[Christophe Dumez (hydr0g3n)]

Ok... But is the backtrace the same?

[0xdb (belov-gmx)]

Yes, the backtraces are exactly the same as above.

[Christophe Dumez (hydr0g3n)]

What exact version of Qt are you using? Qt crashes on the deletion of a Qt object...
I don't understand what the issue could be on my side.

[0xdb (belov-gmx)]

debian lenny with QT v.4.4.3-1.

[Christophe Dumez (hydr0g3n)]

Ah... A Lenny user :) Qt 4.4 should work without problems though.

Could you please install libqt4-dbg package and get the backtrace again with gdb? This way I'll get the line numbers in Qt4 code too and it should help me understand why it crashes.

[Christophe Dumez (hydr0g3n)]

I committing a fix regarding your first backtrace (crash) to SVN. It will be in today's update. Please reopen the bug if you still experience issues with the new package.