If you can reproduce the crash at will, may you read http://techbase.kde.org/Development/Tutorials/Debugging/How_to_create_useful_crash_reports and post a complete backtrace here?
If you can't, read that page too and reopen this bug report if you experience the same bug again.
Thanks :)

************************ backtrace *******************

Program: KNode (knode), signal SIGABRT
[Current thread is 0 (LWP 6643)]

Thread 2 (Thread 0xb187eb90 (LWP 6644)):
#0  0xb7f3a424 in __kernel_vsyscall ()
#1  0xb674dab1 in select () from /lib/i686/cmov/libc.so.6
#2  0xb72e3670 in QProcessManager::run (this=0x84ca190) at io/qprocess_unix.cpp:301
#3  0xb721452e in QThreadPrivate::start (arg=0x84ca190) at thread/qthread_unix.cpp:185
#4  0xb53dc4c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#5  0xb67556de in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb49408d0 (LWP 6643)):
#0  0xb7f3a424 in __kernel_vsyscall ()
#1  0xb6710ef6 in nanosleep () from /lib/i686/cmov/libc.so.6
#2  0xb6710d0f in sleep () from /lib/i686/cmov/libc.so.6
#3  0xb7631fd8 in ?? () from /usr/lib/libkdeui.so.5
#4  0x00000000 in ?? ()

You need to install debug symbols info for KDEPIM (which contains info for KNode)

Hi!

I also got this crash, kNode 0.99.01 is virtually unusuable. :-(

The first time I sucessfully posted an article using this kNode version was after I installed the debugging libraries and tried to get a useful backtrace - Murphy at work. ;)

However, on the next try I got the crash again, the backtrace follows.

I'm using Debian SID and the KDE 4.2.0 final packages from Debian experimental.

Greetings,

  Gunter


Thread 1 (Thread 0xb4b5d8d0 (LWP 11048)):
#0  0xb802e424 in __kernel_vsyscall ()
#1  0xb67b5640 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb67b7018 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb67f902d in malloc_consolidate () from /lib/i686/cmov/libc.so.6
#4  0xb67fa3af in _int_free () from /lib/i686/cmov/libc.so.6
#5  0xb67fa94b in free_check () from /lib/i686/cmov/libc.so.6
#6  0xb67fa7c5 in free () from /lib/i686/cmov/libc.so.6
#7  0xb6d0fddb in ~LayoutData (this=0x92eeed0) at text/qtextengine.cpp:2034
#8  0xb6d164dc in ~QTextEngine (this=0x9036638) at text/qtextengine.cpp:1314
#9  0xb6d17f9a in ~QTextLayout (this=0x0) at text/qtextlayout.cpp:383
#10 0xb6d40cf3 in ~QTextDocumentPrivate (this=0x91fe8b8) at text/qtextdocument_p.h:106
#11 0xb742ff1e in ~QObject (this=0x91fe8a8) at kernel/qobject.cpp:903
#12 0xb6d2c84d in ~QTextDocument (this=0x91fe8a8) at text/qtextdocument.cpp:338
#13 0xb742727f in QObjectPrivate::deleteChildren (this=0x91fe758) at kernel/qobject.cpp:1884
#14 0xb742fdc3 in ~QObject (this=0x91fe748) at kernel/qobject.cpp:884
#15 0xb6d014f8 in ~QTextControl (this=0x91fe748) at text/qtextcontrol.cpp:769
#16 0xb6f1b29a in ~QTextEditControl (this=0x91fe748) at widgets/qtextedit.cpp:75
#17 0xb742727f in QObjectPrivate::deleteChildren (this=0x91fcf98) at kernel/qobject.cpp:1884
#18 0xb6b67788 in ~QWidget (this=0x91ba370) at kernel/qwidget.cpp:1338
#19 0xb6e9a051 in ~QFrame (this=0x91ba370) at widgets/qframe.cpp:238
#20 0xb6f305dd in ~QAbstractScrollArea (this=0x91ba370) at widgets/qabstractscrollarea.cpp:478
#21 0xb6f162c1 in ~QTextEdit (this=0x91ba370) at widgets/qtextedit.cpp:632
#22 0xb77da816 in ~KTextEdit (this=0x91ba370) at ../../kdeui/widgets/ktextedit.cpp:241
#23 0xb77bf8e4 in ~KRichTextEdit (this=0x91ba370) at ../../kdeui/widgets/krichtextedit.cpp:126
#24 0xb77c2bd0 in ~KRichTextWidget (this=0x91ba370) at ../../kdeui/widgets/krichtextwidget.cpp:193
#25 0xb7db8781 in ~KMeditor (this=0x91ba370) at ../../libkdepim/kmeditor.cpp:429
#26 0xb7c3785b in ~KNComposerEditor (this=0x91ba370) at ../../knode/kncomposereditor.cpp:36
#27 0xb742727f in QObjectPrivate::deleteChildren (this=0x91b8dc0) at kernel/qobject.cpp:1884
#28 0xb6b67328 in ~QWidget (this=0x91b8d88) at kernel/qwidget.cpp:1338
#29 0xb742727f in QObjectPrivate::deleteChildren (this=0x91b8b98) at kernel/qobject.cpp:1884
#30 0xb6b67788 in ~QWidget (this=0x91b8b30) at kernel/qwidget.cpp:1338
#31 0xb6e9a051 in ~QFrame (this=0x91b8b30) at widgets/qframe.cpp:238
#32 0xb6f01163 in ~QSplitter (this=0x91b8b30) at widgets/qsplitter.cpp:971
#33 0xb7c360d9 in ~ComposerView (this=0x91b8b30) at ../../knode/kncomposerview.cpp:136
#34 0xb742727f in QObjectPrivate::deleteChildren (this=0x91baaa8) at kernel/qobject.cpp:1884
#35 0xb6b67788 in ~QWidget (this=0x8e23848) at kernel/qwidget.cpp:1338
#36 0xb6eb5671 in ~QMainWindow (this=0x8e23848) at widgets/qmainwindow.cpp:323
#37 0xb77ae159 in ~KMainWindow (this=0x8e23848) at ../../kdeui/widgets/kmainwindow.cpp:466
#38 0xb77f0c87 in ~KXmlGuiWindow (this=0x8e23848, __vtt_parm=0xb7cad1fc)
    at ../../kdeui/xmlgui/kxmlguiwindow.cpp:127
#39 0xb7c2387d in ~KNComposer (this=0x8e23848) at ../../knode/kncomposer.cpp:459
#40 0xb7426f6c in qDeleteInEventHandler (o=0x6) at kernel/qobject.cpp:3659
#41 0xb7428923 in QObject::event (this=0x8e23848, e=0x92e1468) at kernel/qobject.cpp:1139
#42 0xb6b65e64 in QWidget::event (this=0x8e23848, event=0x92e1468) at kernel/qwidget.cpp:7551
#43 0xb6eb6267 in QMainWindow::event (this=0x8e23848, event=0x92e1468) at widgets/qmainwindow.cpp:1268
#44 0xb77ad377 in KMainWindow::event (this=0x8e23848, ev=0x92e1468)
    at ../../kdeui/widgets/kmainwindow.cpp:1093
#45 0xb77f1b2c in KXmlGuiWindow::event (this=0x8e23848, ev=0x92e1468)
    at ../../kdeui/xmlgui/kxmlguiwindow.cpp:131
#46 0xb6b0e79c in QApplicationPrivate::notify_helper (this=0x8a97738, receiver=0x8e23848, e=0x92e1468)
    at kernel/qapplication.cpp:3803
#47 0xb6b166ea in QApplication::notify (this=0xbfb47e6c, receiver=0x8e23848, e=0x92e1468)
    at kernel/qapplication.cpp:3768
#48 0xb76cb77d in KApplication::notify (this=0xbfb47e6c, receiver=0x8e23848, event=0x92e1468)
    at ../../kdeui/kernel/kapplication.cpp:307
#49 0xb74190e1 in QCoreApplication::notifyInternal (this=0xbfb47e6c, receiver=0x8e23848,
    event=0x92e1468) at kernel/qcoreapplication.cpp:587
#50 0xb7419d65 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
    data=0x8a7a4b8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:209
#51 0xb7419f5d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0)
    at kernel/qcoreapplication.cpp:1091
#52 0xb744399f in postEventSourceDispatch (s=0x8a91318)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:214
#53 0xb535c1b8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#54 0xb535f853 in ?? () from /usr/lib/libglib-2.0.so.0
#55 0x08a91290 in ?? ()
#56 0x00000000 in ?? ()

Mh, I just provoked the crash again after installing the glib debug symbols to get rid of the last questions marks in the backtrace, but got a somewhat different backtrace instead. However, it crashes in KNComposer's destructor again, so there seems to be some memory corruption going on at this point...

Thread 1 (Thread 0xb4bf38d0 (LWP 11236)):
#0  0xb80c4424 in __kernel_vsyscall ()   
#1  0xb684b640 in raise () from /lib/i686/cmov/libc.so.6
#2  0xb684d018 in abort () from /lib/i686/cmov/libc.so.6
#3  0xb688e653 in malloc_printerr () from /lib/i686/cmov/libc.so.6
#4  0xb6890573 in _int_free () from /lib/i686/cmov/libc.so.6
#5  0xb689094b in free_check () from /lib/i686/cmov/libc.so.6
#6  0xb68907c5 in free () from /lib/i686/cmov/libc.so.6
#7  0xb6a34401 in operator delete () from /usr/lib/libstdc++.so.6
#8  0xb7cb9898 in ~KNComposer (this=0x9be7758) at ../../knode/kncomposer.cpp:459
#9  0xb74bcf6c in qDeleteInEventHandler (o=0x6) at kernel/qobject.cpp:3659
#10 0xb74be923 in QObject::event (this=0x9be7758, e=0xa0b4860) at kernel/qobject.cpp:1139
#11 0xb6bfbe64 in QWidget::event (this=0x9be7758, event=0xa0b4860) at kernel/qwidget.cpp:7551
#12 0xb6f4c267 in QMainWindow::event (this=0x9be7758, event=0xa0b4860) at widgets/qmainwindow.cpp:1268
#13 0xb7843377 in KMainWindow::event (this=0x9be7758, ev=0xa0b4860)
    at ../../kdeui/widgets/kmainwindow.cpp:1093
#14 0xb7887b2c in KXmlGuiWindow::event (this=0x9be7758, ev=0xa0b4860)
    at ../../kdeui/xmlgui/kxmlguiwindow.cpp:131
#15 0xb6ba479c in QApplicationPrivate::notify_helper (this=0x9864738, receiver=0x9be7758, e=0xa0b4860)
    at kernel/qapplication.cpp:3803
#16 0xb6bac6ea in QApplication::notify (this=0xbfcdfffc, receiver=0x9be7758, e=0xa0b4860)
    at kernel/qapplication.cpp:3768
#17 0xb776177d in KApplication::notify (this=0xbfcdfffc, receiver=0x9be7758, event=0xa0b4860)
    at ../../kdeui/kernel/kapplication.cpp:307
#18 0xb74af0e1 in QCoreApplication::notifyInternal (this=0xbfcdfffc, receiver=0x9be7758,
    event=0xa0b4860) at kernel/qcoreapplication.cpp:587
#19 0xb74afd65 in QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0,
    data=0x98474b8) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:209
#20 0xb74aff5d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0)
    at kernel/qcoreapplication.cpp:1091
#21 0xb74d999f in postEventSourceDispatch (s=0x985e318)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:214
#22 0xb53f21b8 in IA__g_main_context_dispatch (context=0x985e290)
    at /tmp/buildd/glib2.0-2.16.6/glib/gmain.c:2012
#23 0xb53f5853 in g_main_context_iterate (context=0x985e290, block=1, dispatch=1, self=0x9864c10)
    at /tmp/buildd/glib2.0-2.16.6/glib/gmain.c:2645
#24 0xb53f5a11 in IA__g_main_context_iteration (context=0x985e290, may_block=1)
    at /tmp/buildd/glib2.0-2.16.6/glib/gmain.c:2708
#25 0xb74d95e8 in QEventDispatcherGlib::processEvents (this=0x9856c18, flags={i = -1077018872})
    at kernel/qeventdispatcher_glib.cpp:319
#26 0xb6c3dd75 in QGuiEventDispatcherGlib::processEvents (this=0x9856c18, flags={i = -1077018824})
    at kernel/qguieventdispatcher_glib.cpp:198
#27 0xb74ad7aa in QEventLoop::processEvents (this=0xbfcdffb0, flags={i = -1077018760})
    at kernel/qeventloop.cpp:143
#28 0xb74ad96a in QEventLoop::exec (this=0xbfcdffb0, flags={i = -1077018696})
    at kernel/qeventloop.cpp:194
---Type <return> to continue, or q <return> to quit---
#29 0xb74b0025 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:845
#30 0xb6ba4617 in QApplication::exec () at kernel/qapplication.cpp:3331
#31 0x0804ea1f in main (argc=Cannot access memory at address 0x2be4
) at ../../knode/main.cpp:41

Created attachment 30813 [details]
Valgrind log of knode posting a message.

kNode did not crash while running under valgrind, however valgrind did report some errors in KNComposer's destructor, maybe including the ause for the frequent crash?

This problem looks like the same as the one in #182322.

*** This bug has been marked as a duplicate of bug 182322 ***