On 29-03-2010 08:21, kaushik wrote: > https://bugs.kde.org/show_bug.cgi?id=228704 > > Kopete crashes when using backspace in chat window > Somebody told me about this bug on irc and i was able to reproduce it, > so I sat down to fix it. > At first i thought the bug was in kopete, but later it seemed to me > that it was somewhere in qt. It appeared to me as some kind of race > condition. > > kopete crash report and valgrind log is attached. > I reached the file > qt-kde/src/gui/text/qtextcursor.cpp > > I did the following modification which filxed my crash. > The contents of the diff file are > > diff --git a/src/gui/text/qtextcursor.cpp b/src/gui/text/qtextcursor.cpp > index 51eca9c..52632ac 100644 > --- a/src/gui/text/qtextcursor.cpp > +++ b/src/gui/text/qtextcursor.cpp > @@ -169,9 +169,14 @@ void QTextCursorPrivate::remove() > adjusted_anchor = anchor = position; > priv->endEditBlock(); > } else { > + QTextDocumentPrivate *testing; > + testing = priv; > + qDebug() << "initial priv="<<priv << " testing=" << testing; > priv->remove(pos1, pos2-pos1, op); > adjusted_anchor = anchor = position; > - priv->finishEdit(); > + qDebug() << "final priv=" << priv << " testing =" << testing; > + if ( priv && (testing == priv)) > + priv->finishEdit(); > } > > } > > now when i re ran kopete, i got the qdebug output as > > initial priv= 0xa3cecf0 testing= 0xa3cecf0 > final priv= 0xa3cecf0 testing = > 0xa3cecf0 > > > initial priv= 0xa3cecf0 testing= > 0xa3cecf0 > > > final priv= 0xa3cecf0 testing = > 0xa3cecf0 > > > initial priv= 0xa3cecf0 testing= > 0xa3cecf0 > > > final priv= 0x0 testing = 0xa3cecf0 > > So, somewhere in the method call > priv->remove(pos1, pos2-pos1, op); > the pointer value gets modified, which leads to crash. > I was not able to figure out where exactly in the method > priv->remove(pos1, pos2-pos1, op); it is getting modified. > Probably somebody more experienced that me can take a look at it. > > > > > > -- > Greetings, > KDE Developer > irc nick - roide > roideuniverse dot blogspot dot com > twitter dot com/roideuniverse > --There is no shortcut to Success! > > > _______________________________________________ > kopete-devel mailing list > kopete-devel@kde.org > https://mail.kde.org/mailman/listinfo/kopete-devel >
I got the same error here, but I was unable to debug, as when I compile QT with debug, the crash does not happen anymore.
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