Hello,
I experience somewhat random segfaults when running my program. I ran python
with gdb and get a backtrace but I don't know what to do now. I can't even
decide which of Qt or PyQt is the culprit.
My system: Debian sid, with packages python2.6-dbg (2.6.6-6), python-qt4-dbg
(4.7.3-1+b1), libqt4-dbg (4:4.6.3-4)
(maybe the problem is simply because pyqt and qt versions mismatch on my system)
Despite the -dbg packages installed, there are still a few ?? in the trace.
The (big) backtrace:
(gdb) bt
#0 0x0012 in ?? ()
#1 0xb69337d9 in QMetaObject::cast (this=0xb625cfe4, obj=0x8998440)
at kernel/qmetaobject.cpp:266
#2 0xb61fb816 in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#3 0xb61fb945 in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtCore.so
#4 0xb69337aa in QMetaObject::metacall (object=0x898b798,
cl=QMetaObject::InvokeMetaMethod, idx=5, argv=0x8a321a8)
at kernel/qmetaobject.cpp:237
#5 0xb693dd36 in QMetaCallEvent::placeMetaCall (this=0x8998770, object=
0x898b798) at kernel/qobject.cpp:561
#6 0xb693edfe in QObject::event (this=0x898b798, e=0x8998770)
at kernel/qobject.cpp:1248
#7 0xb6b9e5cc in QApplicationPrivate::notify_helper (this=0x8480a10, receiver=
0x898b798, e=0x8998770) at kernel/qapplication.cpp:4302
#8 0xb6ba515e in QApplication::notify (this=0x850c080, receiver=0x898b798, e=
0x8998770) at kernel/qapplication.cpp:3706
#9 0xb78a320f in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtGui.so
#10 0xb692e4cb in QCoreApplication::notifyInternal (this=0x850c080, receiver=
0x898b798, event=0x8998770) at kernel/qcoreapplication.cpp:726
#11 0xb6931f2c in sendEvent (receiver=0x0, event_type=0, data=0x82ccfe0)
at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#12 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
data=0x82ccfe0) at kernel/qcoreapplication.cpp:1367
---Type return to continue, or q return to quit---
#13 0xb69320ad in QCoreApplication::sendPostedEvents (receiver=0x0,
event_type=0) at kernel/qcoreapplication.cpp:1260
#14 0xb695a57f in sendPostedEvents (s=0x836fa10)
at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#15 postEventSourceDispatch (s=0x836fa10)
at kernel/qeventdispatcher_glib.cpp:276
#16 0xb65dc305 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#17 0xb65dffe8 in ?? () from /lib/libglib-2.0.so.0
#18 0xb65e01c8 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#19 0xb695a075 in QEventDispatcherGlib::processEvents (this=0x829aba8,
flags=...) at kernel/qeventdispatcher_glib.cpp:412
#20 0xb6c5ced5 in QGuiEventDispatcherGlib::processEvents (this=0x829aba8,
flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#21 0xb692cae9 in QEventLoop::processEvents (this=0xbfffef84, flags=DWARF-2
expression error: DW_OP_reg operations must be used either alone or in
conjuction with DW_OP_piece or DW_OP_bit_piece.
)
at kernel/qeventloop.cpp:149
#22 0xb692cf3a in QEventLoop::exec (this=0xbfffef84, flags=...)
at kernel/qeventloop.cpp:201
#23 0xb693216f in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1003
#24 0xb6b9e667 in QApplication::exec () at kernel/qapplication.cpp:3581
#25 0xb78a3da8 in ?? () from /usr/lib/pymodules/python2.6/PyQt4/QtGui.so
#26 0x080e0721 in call_function (f=
Frame 0x82e7ffc, for file prog/guis/tags4/app.py, line 115, in module (),
throwflag=0) at ../Python/ceval.c:3750
---Type return to continue, or q return to quit---
#27 PyEval_EvalFrameEx (f=
Frame 0x82e7ffc, for file prog/guis/tags4/app.py, line 115, in module (),
throwflag=0) at ../Python/ceval.c:2412
#28 0x080e2507 in PyEval_EvalCodeEx (co=0xb7c2f698, globals=
{'QAbstractButton': PyQt4.QtCore.pyqtWrapperType at remote 0x8372294,
'QSizePolicy': PyQt4.QtCore.pyqtWrapperType at remote 0x83eedbc, 'qFatal':
built-in function qFatal, 'QMatrix3x4': PyQt4.QtCore.pyqtWrapperType at
remote 0x83dda44, 'QMatrix3x3': PyQt4.QtCore.pyqtWrapperType at remote
0x83dd6d4, 'QMatrix3x2': PyQt4.QtCore.pyqtWrapperType at remote 0x83dd364,
'QGraphicsColorizeEffect': PyQt4.QtCore.pyqtWrapperType at remote 0x838b034,
'qRound64': built-in function qRound64, 'QSizeGrip':
PyQt4.QtCore.pyqtWrapperType at remote 0x83eebd4, 'QStyleOptionComboBox':
PyQt4.QtCore.pyqtWrapperType at remote 0x83f70cc, 'QX11Info':
PyQt4.QtCore.pyqtWrapperType at remote 0x841fcdc, 'QAbstractSpinBox':
PyQt4.QtCore.pyqtWrapperType at remote 0x8375d44, 'QTreeView':
PyQt4.QtCore.pyqtWrapperType at remote 0x838462c, 'qFuzzyCompare': built-in
function qFuzzyCompare, 'QFontComboBox': PyQt4.QtCore.pyqtWrapperType at
remote 0x8385e34, 'QGraphicsTextItem': PyQt4
.QtCore.pyqtWrapperType at remote 0x83...(truncated), locals=
{'QAbstractButton': PyQt4.QtCore.pyqtWrapperType at remote 0x8372294,
'QSizePolicy': PyQt4.QtCore.pyqtWrapperType at remote 0x83eedbc, 'qFatal':
built-in function qFatal, 'QMatrix3x4': PyQt4.QtCore.pyqtWrapperType at
remote 0x83dda44,
