Bug 85142

Summary:	Crashes and other abnormalities when using Alternative Learning Method
Product:	[Unmaintained] kvoctrain	Reporter:	Kirill <bugs-kde-org>
Component:	general	Assignee:	Peter Hedlund <peter>
Status:	RESOLVED FIXED
Severity:	crash
Priority:	NOR
Version First Reported In:	unspecified
Target Milestone:	---
Platform:	Compiled Sources
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	This is the file that causes the crash above

Description Kirill 2004-07-14 03:57:06 UTC

Version:            (using KDE Devel)
Installed from:    Compiled sources
OS:                Linux

I loaded a kvtml file, opened the Random Query dialog, then closed it after answering a few queries, everything worked fine. Then I went to Query Options, Queries tab and checked Use Advanced Learning Method. I the chose Recover Query to open the Random Query dialog again. Then I clicked the I Know It button, which in the code is the equivalent of answering the query correctly. At that point KVocTrain crashed. Sorry I did not save the stack trace, but I remember that kvoctrainApp::getTranslation was the one that caused the crash.

I then repeated the above steps once or twice with the same results.

Next time I checked the Use Advanced Learning Method before starting the query for the first time. Then it worked fine, but I noticed a weird thing: after a while it showed the number of answers that was greater that the total number of queries, in the box on the right, like 9/8, 10/8, 11/8 etc. This does not happen with the normal learning method.

After that I tried to reproduce the initial crash problem but so far I could not. If I get it again, I will post more details. But the Advanced Learning Method does need more work IMHO.

Comment 1 Kirill 2004-07-14 04:04:35 UTC

OK, I got a crash when trying to start a new Random Query. Advanced Learning was enabled.

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 1100351136 (LWP 22801)]
0x414ab40e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#0  0x414ab40e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#1  0x40bfddd0 in KCrash::defaultCrashHandler () from /usr/lib/libkdecore.so.4
#2  <signal handler called>
#3  0x4168df19 in raise () from /lib/tls/libc.so.6
#4  0x4179bebc in ?? () from /lib/tls/libc.so.6
#5  0x416205b0 in vtable for std::bad_alloc () from /usr/lib/libstdc++.so.5
#6  0x4168f771 in abort () from /lib/tls/libc.so.6
#7  0x00000000 in ?? ()
#8  0x00000020 in ?? ()
#9  0x00000000 in ?? ()
#10 0x00000000 in ?? ()
#11 0x00000000 in ?? ()
#12 0x00000000 in ?? ()
#13 0x00000000 in ?? ()
#14 0x00000000 in ?? ()
#15 0x00000000 in ?? ()
#16 0x00000000 in ?? ()
#17 0x00000000 in ?? ()
#18 0x00000000 in ?? ()
#19 0x00000000 in ?? ()
#20 0x00000000 in ?? ()
#21 0x00000000 in ?? ()
#22 0x00000000 in ?? ()
#23 0x00000000 in ?? ()
#24 0x00000000 in ?? ()
#25 0x00000000 in ?? ()
#26 0x00000000 in ?? ()
#27 0x00000000 in ?? ()
#28 0x00000000 in ?? ()
#29 0x00000000 in ?? ()
#30 0x00000000 in ?? ()
#31 0x00000000 in ?? ()
#32 0x00000000 in ?? ()
#33 0x00000000 in ?? ()
#34 0x00000000 in ?? ()
#35 0x00000000 in ?? ()
#36 0x00000000 in ?? ()
#37 0x00000000 in ?? ()
#38 0x00000000 in ?? ()
#39 0x00000000 in ?? ()
#40 0x00000000 in ?? ()
#41 0x00000000 in ?? ()
#42 0x00000000 in ?? ()
#43 0x09844246 in ?? ()
#44 0xbfffe9f0 in ?? ()
#45 0x414a0788 in ?? ()
#46 0x0806e0db in std::vector<QueryEntryRef, std::allocator<QueryEntryRef> >::_M_insert_aux ()
#47 0x41610044 in std::terminate () from /usr/lib/libstdc++.so.5
#48 0x416101b6 in __cxa_throw () from /usr/lib/libstdc++.so.5
#49 0x4161040f in operator new () from /usr/lib/libstdc++.so.5
#50 0x415fc6b9 in std::__default_alloc_template<true, 0>::allocate ()
   from /usr/lib/libstdc++.so.5
#51 0x0806e0db in std::vector<QueryEntryRef, std::allocator<QueryEntryRef> >::_M_insert_aux ()
#52 0x0812a195 in QueryManager::select ()
#53 0x08098869 in kvoctrainApp::slotStartQuery ()
#54 0x080932f5 in kvoctrainApp::slotHeaderCallBack ()
#55 0x0807fda9 in kvoctrainApp::qt_invoke ()
#56 0x40fe2e9c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#57 0x40fe2ffd in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#58 0x4131ff12 in QPopupMenu::activated () from /usr/lib/libqt-mt.so.3
#59 0x410e2def in QPopupMenu::actSig () from /usr/lib/libqt-mt.so.3
#60 0x410e74aa in QPopupMenu::mouseReleaseEvent () from /usr/lib/libqt-mt.so.3
#61 0x41018637 in QWidget::event () from /usr/lib/libqt-mt.so.3
#62 0x40f86aff in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#63 0x40f861f4 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#64 0x40b78af9 in KApplication::notify () from /usr/lib/libkdecore.so.4
#65 0x40f1d471 in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#66 0x40f1b161 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#67 0x40f317d4 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#68 0x40f9a498 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#69 0x40f9a348 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#70 0x40f86d51 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#71 0x08085e9f in main ()

Comment 2 Kirill 2004-07-14 04:08:13 UTC

Created attachment 6671 [details]
This is the file that causes the crash above

Check Use Advanced Learning Method, uncheck Swap Query Direction Randomly in
Query Options. Open this file. Choose Learning/translation 1/Create Random
Query. It should crash then.

Comment 3 Kirill 2004-07-14 04:18:17 UTC

OK, I am unable to create a new random query anymore when the advanced method is on. Without it everything works fine. Here is another crash I once got by just clicking on the KVocTrain menu bar:

Using host libthread_db library "/lib/tls/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 1100351136 (LWP 23251)]
0x414ab40e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#0  0x414ab40e in __waitpid_nocancel () from /lib/tls/libpthread.so.0
#1  0x40bfddd0 in KCrash::defaultCrashHandler () from /usr/lib/libkdecore.so.4
#2  <signal handler called>
#3  0x412a0c1b in QString::QString () from /usr/lib/libqt-mt.so.3
#4  0x080f0862 in kvoctrainDoc::getIdent ()
#5  0x0807bb6e in kvoctrainApp::aboutToShowLearn ()
#6  0x0807fef3 in kvoctrainApp::qt_invoke ()
#7  0x40fe2e9c in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#8  0x40fe2cc4 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#9  0x4132000e in QPopupMenu::aboutToShow () from /usr/lib/libqt-mt.so.3
#10 0x410e2bf0 in QPopupMenu::popup () from /usr/lib/libqt-mt.so.3
#11 0x410db444 in QMenuBar::openActPopup () from /usr/lib/libqt-mt.so.3
#12 0x410dd6f8 in QMenuBar::setActiveItem () from /usr/lib/libqt-mt.so.3
#13 0x410dcc9a in QMenuBar::mousePressEvent () from /usr/lib/libqt-mt.so.3
#14 0x41018626 in QWidget::event () from /usr/lib/libqt-mt.so.3
#15 0x40f86aff in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#16 0x40f861f4 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#17 0x40b78af9 in KApplication::notify () from /usr/lib/libkdecore.so.4
#18 0x40f1d880 in QETWidget::translateMouseEvent ()
   from /usr/lib/libqt-mt.so.3
#19 0x40f1b161 in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#20 0x40f317d4 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#21 0x40f9a498 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#22 0x40f9a348 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#23 0x40f86d51 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#24 0x08085e9f in main ()

So let me know if you need any other info.

Comment 4 Peter Hedlund 2005-01-10 04:17:57 UTC

CVS commit by hedlund: 

Don't crash when using the Leitner method.
BUG: 85142


  M +5 -7      QueryManager.cpp   1.19


--- kdeedu/kvoctrain/kvoctrain/kvt-core/QueryManager.cpp  #1.18:1.19
@@ -1,6 +1,4 @@
 /***************************************************************************
 
-    $Id$
-
                              manage queries
 
@@ -267,5 +265,5 @@ QuerySelection QueryManager::select(kvoc
      unsigned int lessonno;
      if (altlearn)
-       lessonno = 1; //We only use a single array in Leitner style
+       lessonno = 0; //We only use a single array in Leitner style
      else
        lessonno = expr->getLesson();