Application: kmail (1.13.6)
KDE Platform Version: 4.6.2 (4.6.2)
Qt Version: 4.7.2
Operating System: Linux 2.6.38-11-generic i686
Distribution: Ubuntu 11.04

-- Information about the crash:
- What I was doing when the application crashed:
I started kmail, then minimized the window. While I was reading the kmail manual in KDE Help Center, kmail crashed with no particular input or event.

Here is all the information from the terminal in which I started it:
$ (kmail &)
$ KGlobal::locale::Warning your global KLocale is being recreated with a valid main component instead of a fake component, this usually means you tried to call i18n related functions before your main component was created. You should not do that since it most likely will not work 
kmail(16687) KMFolder::updateIndicatorIcon: Could not read image from "" 
kmail(16687) KMFolder::updateIndicatorIcon: Could not read image from "" 
kmail(16687)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
kmail(16687)/kdecore (KConfigSkeleton) KCoreConfigSkeleton::writeConfig:
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 6 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 3 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 43 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 450 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 447 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 487 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 610 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 607 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 647 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 770 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 767 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 807 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 930 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 927 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 967 
QPainter::begin: Widget painting can only begin as a result of a paintEvent
QPainter::translate: Painter not active
QPainter::setClipRect: Painter not active
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Folder..." under id 1090 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&New Message..." under id 1087 
void DBusMenuExporterPrivate::addAction(QAction*, int): Already tracking action "&Find Messages..." under id 1127 
*** KMail got signal 11 (Crashing)
KCrash: Application 'kmail' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/black/.kde/socket-coldstone/kdeinit4__0

The crash can be reproduced some of the time.

-- Backtrace:
Application: KMail (kmail), signal: Segmentation fault
[Current thread is 1 (Thread 0xb76e6780 (LWP 16687))]

Thread 2 (Thread 0xb74bcb70 (LWP 16688)):
#0  0x00bbe416 in __kernel_vsyscall ()
#1  0x008fef76 in poll () from /lib/i386-linux-gnu/libc.so.6
#2  0x0225484b in g_poll () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0x022441af in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0x0224492b in g_main_loop_run () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0x02d87304 in ?? () from /usr/lib/i386-linux-gnu/libgio-2.0.so.0
#6  0x0226d2df in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#7  0x0185be99 in start_thread () from /lib/i386-linux-gnu/libpthread.so.0
#8  0x0090d73e in clone () from /lib/i386-linux-gnu/libc.so.6

Thread 1 (Thread 0xb76e6780 (LWP 16687)):
[KCrash Handler]
#7  0x00000000 in ?? ()
#8  0x00f520a8 in KMMsgBase::syncIndexString (this=0xa4e39d8) at ../../kmail/kmmsgbase.cpp:1221
#9  0x010bbd8d in KMFolderIndex::updateIndex (this=0x9ff16e8, aboutToClose=true) at ../../kmail/kmfolderindex.cpp:73
#10 0x00fb5190 in KMFolderMaildir::reallyDoClose (this=0x9ff16e8) at ../../kmail/kmfoldermaildir.cpp:188
#11 0x00ee95ad in FolderStorage::close (this=0x9ff16e8, aForced=false) at ../../kmail/folderstorage.cpp:110
#12 0x0114d32d in KMail::ExpireJob::slotMessagesMoved (this=0xa4c2190, command=0xa5b6130) at ../../kmail/expirejob.cpp:208
#13 0x0114eed4 in KMail::ExpireJob::qt_metacall (this=0xa4c2190, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfc5ca68) at ./expirejob.moc:75
#14 0x03b566ba in QMetaObject::metacall (object=0xa4c2190, cl=QMetaObject::InvokeMetaMethod, idx=13, argv=0xbfc5ca68) at kernel/qmetaobject.cpp:237
#15 0x03b664ff in QMetaObject::activate (sender=0xa5b6130, m=0x13d51f4, local_signal_index=1, argv=0xbfc5ca68) at kernel/qobject.cpp:3287
#16 0x01074de3 in KMCommand::completed (this=0xa5b6130, _t1=0xa5b6130) at ./kmcommands.moc:115
#17 0x01089c39 in KMMoveCommand::completeMove (this=0xa5b6130, result=KMCommand::OK) at ../../kmail/kmcommands.cpp:2339
#18 0x0108a9f2 in KMMoveCommand::execute (this=0xa5b6130) at ../../kmail/kmcommands.cpp:2269
#19 0x0107da42 in KMCommand::slotPostTransfer (this=0xa5b6130, result=KMCommand::OK) at ../../kmail/kmcommands.cpp:295
#20 0x01084f4f in KMCommand::qt_metacall (this=0xa5b6130, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xbfc5cd38) at ./kmcommands.moc:93
#21 0x01089f7a in KMMoveCommand::qt_metacall (this=0xa5b6130, _c=QMetaObject::InvokeMetaMethod, _id=9, _a=0xbfc5cd38) at ./kmcommands.moc:1971
#22 0x03b566ba in QMetaObject::metacall (object=0xa5b6130, cl=QMetaObject::InvokeMetaMethod, idx=9, argv=0xbfc5cd38) at kernel/qmetaobject.cpp:237
#23 0x03b664ff in QMetaObject::activate (sender=0xa5b6130, m=0x13d51f4, local_signal_index=0, argv=0xbfc5cd38) at kernel/qobject.cpp:3287
#24 0x01074d93 in KMCommand::messagesTransfered (this=0xa5b6130, _t1=KMCommand::OK) at ./kmcommands.moc:108
#25 0x0107d5f6 in KMCommand::transferSelectedMsgs (this=0xa5b6130) at ../../kmail/kmcommands.cpp:393
#26 0x0107d81e in KMCommand::slotStart (this=0xa5b6130) at ../../kmail/kmcommands.cpp:287
#27 0x01084f2b in KMCommand::qt_metacall (this=0xa5b6130, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0xa4d5b90) at ./kmcommands.moc:92
#28 0x01089f7a in KMMoveCommand::qt_metacall (this=0xa5b6130, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0xa4d5b90) at ./kmcommands.moc:1971
#29 0x03b566ba in QMetaObject::metacall (object=0xa5b6130, cl=QMetaObject::InvokeMetaMethod, idx=8, argv=0xa4d5b90) at kernel/qmetaobject.cpp:237
#30 0x03b60e16 in QMetaCallEvent::placeMetaCall (this=0xa483540, object=0xa5b6130) at kernel/qobject.cpp:535
#31 0x03b653b7 in QObject::event (this=0xa5b6130, e=0xa483540) at kernel/qobject.cpp:1226
#32 0x067e0d24 in QApplicationPrivate::notify_helper (this=0x9cc48b0, receiver=0xa5b6130, e=0xa483540) at kernel/qapplication.cpp:4462
#33 0x067e58ce in QApplication::notify (this=0xbfc5d7bc, receiver=0xa5b6130, e=0xa483540) at kernel/qapplication.cpp:3862
#34 0x002f13ca in KApplication::notify (this=0xbfc5d7bc, receiver=0xa5b6130, event=0xa483540) at ../../kdeui/kernel/kapplication.cpp:311
#35 0x03b500bb in QCoreApplication::notifyInternal (this=0xbfc5d7bc, receiver=0xa5b6130, event=0xa483540) at kernel/qcoreapplication.cpp:731
#36 0x03b53c79 in sendEvent (receiver=0x0, event_type=0, data=0x9c69038) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#37 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x9c69038) at kernel/qcoreapplication.cpp:1372
#38 0x03b53e0d in QCoreApplication::sendPostedEvents (receiver=0x0, event_type=0) at kernel/qcoreapplication.cpp:1265
#39 0x03b7d3c4 in sendPostedEvents (s=0x9ccced0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#40 postEventSourceDispatch (s=0x9ccced0) at kernel/qeventdispatcher_glib.cpp:277
#41 0x02243aa8 in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#42 0x02244270 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#43 0x02244524 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#44 0x03b7d53c in QEventDispatcherGlib::processEvents (this=0x9cc3b68, flags=...) at kernel/qeventdispatcher_glib.cpp:422
#45 0x068971e5 in QGuiEventDispatcherGlib::processEvents (this=0x9cc3b68, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#46 0x03b4f289 in QEventLoop::processEvents (this=0xbfc5d684, flags=...) at kernel/qeventloop.cpp:149
#47 0x03b4f522 in QEventLoop::exec (this=0xbfc5d684, flags=...) at kernel/qeventloop.cpp:201
#48 0x03b53ecc in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1008
#49 0x067de8e7 in QApplication::exec () at kernel/qapplication.cpp:3736
#50 0x0804a733 in main (argc=) at ../../kmail/main.cpp:158

Reported using DrKonqi