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Thread: Weird crash caused by a QTreeView

  1. 10th September 2006, 17:50 #1
    vfernandez
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    Default Weird crash caused by a QTreeView

    I have a QTreeView with an editable model and everything is working fine, but sometimes the program crashes. It happens sometimes when you move the mouse over a selected item. The model is acts as a two-column list, and it usually contains just a few items. This is the backtrace:

    Qt Code: 
    1. Program received signal SIGABRT, Aborted.
    2. [Switching to Thread -1223207248 (LWP 6446)]
    3. 0xffffe410 in __kernel_vsyscall ()
    4. (gdb) bt
    5. #0  0xffffe410 in __kernel_vsyscall ()
    6. #1  0xb72e67d0 in raise () from /lib/libc.so.6
    7. #2  0xb72e7ea3 in abort () from /lib/libc.so.6
    8. #3  0xb7547c1a in qt_message_output (msgType=QtFatalMsg,
    9.     buf=0xbfd25420 "ASSERT: \"false\" in file itemviews/qtreeview.cpp, line 1909") at global/qglobal.cpp:1931
    10. #4  0xb7547c79 in qFatal (msg=0xb763430c "ASSERT: \"%s\" in file %s, line %d") at global/qglobal.cpp:2147
    11. #5  0xb7547cf9 in qt_assert (assertion=0xb7e3d512 "false", file=0xb7e3d4d8 "itemviews/qtreeview.cpp", line=1909)
    12.     at global/qglobal.cpp:1691
    13. #6  0xb7dae137 in QTreeViewPrivate::coordinate (this=0x843b758, item=1) at itemviews/qtreeview.cpp:1909
    14. #7  0xb7dae2a4 in QTreeViewPrivate::item (this=0x843b758, yCoordinate=49) at itemviews/qtreeview.cpp:1948
    15. #8  0xb7daf30e in QTreeView::indexAt (this=0x843b740, point=@0xbfd27afc) at itemviews/qtreeview.cpp:1130
    16. #9  0xb7d86863 in QAbstractItemView::viewportEvent (this=0x843b740, event=0xbfd27af0)
    17.     at itemviews/qabstractitemview.cpp:931
    18. #10 0xb7d21d33 in QAbstractScrollAreaPrivate::viewportEvent (this=0x843b758, e=0xbfd27af0)
    19.     at widgets/qabstractscrollarea.cpp:93
    20. #11 0xb7d21cb7 in QAbstractScrollAreaViewport::event (this=0x843bea8, e=0xbfd27af0) at widgets/qabstractscrollarea.cpp:105
    21. #12 0xb79f4077 in QApplicationPrivate::notify_helper (this=0x8140100, receiver=0x843bea8, e=0xbfd27af0)
    22.     at kernel/qapplication.cpp:3175
    23. #13 0xb79f5748 in QApplication::notify (this=0xbfd282c4, receiver=0x843bea8, e=0xbfd27af0) at kernel/qapplication.cpp:3040
    24. #14 0xb79f1bdb in QCoreApplication::sendEvent (receiver=0x843bea8, event=0xbfd27af0)
    25.     at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:173
    26. #15 0xb79f7f68 in QApplication::event (this=0xbfd282c4, e=0xbfd27f30) at kernel/qapplication.cpp:1838
    27. #16 0xb79f4077 in QApplicationPrivate::notify_helper (this=0x8140100, receiver=0xbfd282c4, e=0xbfd27f30)
    28.     at kernel/qapplication.cpp:3175
    29. #17 0xb79f439a in QApplication::notify (this=0xbfd282c4, receiver=0xbfd282c4, e=0xbfd27f30) at kernel/qapplication.cpp:2799
    30. #18 0xb75f8d17 in QCoreApplication::sendEvent (receiver=0xbfd282c4, event=0xbfd27f30) at kernel/qcoreapplication.h:173
    31. #19 0xb761f322 in QEventDispatcherUNIX::activateTimers (this=0x814aa30) at kernel/qeventdispatcher_unix.cpp:677
    32. #20 0xb761fdba in QEventDispatcherUNIX::processEvents (this=0x814aa30, flags=@0xbfd280bc)
    33.     at kernel/qeventdispatcher_unix.cpp:806
    34. #21 0xb7a6feab in QEventDispatcherX11::processEvents (this=0x814aa30, flags=@0xbfd280f4)
    35.     at kernel/qeventdispatcher_x11.cpp:132
    36. #22 0xb75f2d11 in QEventLoop::processEvents (this=0xbfd28178, flags=@0xbfd2812c) at kernel/qeventloop.cpp:124
    37. #23 0xb75f2eb6 in QEventLoop::exec (this=0xbfd28178, flags=@0xbfd28180) at kernel/qeventloop.cpp:169
    38. #24 0xb75f6ff4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:679
    39. #25 0xb79f5c7c in QApplication::exec () at kernel/qapplication.cpp:2720
    40. #26 0x08068d4b in main (argc=1, argv=0xbfd283f4) at main.cpp:115
    41. (gdb)
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    Apparently, it has nothing to do with my code, since none of my methods appear in the backtrace. Any idea? Might it be a QT bug? I'm using QT 4.1.3.
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  2. 10th September 2006, 18:31 #2
    jacek
    jacek is offline Guru
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    Default Re: Weird crash caused by a QTreeView

    In Qt 4.1.4 Changelog you can find:
    - QTreeView
    Fixed potential assert when asking for the coordinates of a non-existing item.
    This might be the same problem, so check whether your program still crashes if you use Qt 4.1.4.
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