Kontact was working perfectly fine until recently. Now, I got regular crashes with Kontact. It does not happen if I execute certain
actions. It also happens, I guess, because of some background process, when I
leave the computer alone.

debug:

Application: Kontact (kontact), signal SIGABRT
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb4c886c0 (LWP 11919)]
[New Thread 0xb0fb8b90 (LWP 11974)]
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[KCrash handler]
#6 0xb7f66430 in __kernel_vsyscall ()
#7 0xb6af6880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb6af8248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7d54795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb7d54872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb7d54915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb17d3540 in ?? () from /usr/lib/libkmailprivate.so.4
#13 0xb18355ea in ?? () from /usr/lib/libkmailprivate.so.4
#14 0xb1670114 in ?? () from /usr/lib/libkmailprivate.so.4
#15 0xb183dc39 in ?? () from /usr/lib/libkmailprivate.so.4
#16 0xb18afc60 in ?? () from /usr/lib/libkmailprivate.so.4
#17 0xb18948ed in ?? () from /usr/lib/libkmailprivate.so.4
#18 0xb1865624 in ?? () from /usr/lib/libkmailprivate.so.4
#19 0xb185a0ef in ?? () from /usr/lib/libkmailprivate.so.4
#20 0xb184fa6b in ?? () from /usr/lib/libkmailprivate.so.4
#21 0xb18501d7 in ?? () from /usr/lib/libkmailprivate.so.4
#22 0xb19e22bf in ?? () from /usr/lib/libkmailprivate.so.4
#23 0xb19e09c7 in ?? () from /usr/lib/libkmailprivate.so.4
#24 0xb7e61a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb7e627e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb7bc6283 in KJob::result () from /usr/lib/libkdecore.so.5
#27 0xb7bc6792 in KJob::emitResult () from /usr/lib/libkdecore.so.5
#28 0xb64a18c5 in KIO::SimpleJob::slotFinished () from /usr/lib/libkio.so.5
#29 0xb64a8353 in KIO::TransferJob::slotFinished () from /usr/lib/libkio.so.5
#30 0xb649f853 in KIO::SimpleJob::slotError () from /usr/lib/libkio.so.5
#31 0xb649fa4b in KIO::SimpleJob::qt_metacall () from /usr/lib/libkio.so.5
#32 0xb64a8fea in KIO::TransferJob::qt_metacall () from /usr/lib/libkio.so.5
#33 0xb7e61a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0xb7e627e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#35 0xb6567fb9 in KIO::SlaveInterface::error () from /usr/lib/libkio.so.5
#36 0xb656bc87 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#37 0xb65686a7 in KIO::SlaveInterface::dispatch () from /usr/lib/libkio.so.5
#38 0xb65586cd in KIO::Slave::gotInput () from /usr/lib/libkio.so.5
#39 0xb655b113 in KIO::Slave::qt_metacall () from /usr/lib/libkio.so.5
#40 0xb7e61a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#41 0xb7e627e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#42 0xb64688f7 in KIO::Connection::readyRead () from /usr/lib/libkio.so.5
#43 0xb646a9c9 in ?? () from /usr/lib/libkio.so.5
#44 0xb646ab56 in KIO::Connection::qt_metacall () from /usr/lib/libkio.so.5
#45 0xb7e5abfb in QMetaCallEvent::placeMetaCall ()
from /usr/lib/libQtCore.so.4
#46 0xb7e5c771 in QObject::event () from /usr/lib/libQtCore.so.4
#47 0xb6e538ec in QApplicationPrivate::notify_helper ()
from /usr/lib/libQtGui.so.4
#48 0xb6e5b72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#49 0xb794eb2d in KApplication::notify () from /usr/lib/libkdeui.so.5
#50 0xb7e4ce61 in QCoreApplication::notifyInternal ()
from /usr/lib/libQtCore.so.4
#51 0xb7e4dae5 in QCoreApplicationPrivate::sendPostedEvents ()
from /usr/lib/libQtCore.so.4
#52 0xb7e4dcdd in QCoreApplication::sendPostedEvents ()
from /usr/lib/libQtCore.so.4
#53 0xb7e7782f in ?? () from /usr/lib/libQtCore.so.4
#54 0xb6a286f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#55 0xb6a2bda3 in ?? () from /usr/lib/libglib-2.0.so.0
#56 0xb6a2bf61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#57 0xb7e77478 in QEventDispatcherGlib::processEvents ()
from /usr/lib/libQtCore.so.4
#58 0xb6eedea5 in ?? () from /usr/lib/libQtGui.so.4
#59 0xb7e4b52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#60 0xb7e4b6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#61 0xb7e4dda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#62 0xb6e53767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#63 0x0804bf52 in _start ()
#0 0xb7f66430 in __kernel_vsyscall ()

Could anybody help?

Thanks in advance.

Regards.

Ákos

This is more informative:

Application: Kontact (kontact), signal SIGABRT
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread 0xb4df76c0 (LWP 25083)]
[New Thread 0xad277b90 (LWP 26199)]
[KCrash handler]
#6 0xb80d5430 in __kernel_vsyscall ()
#7 0xb6c65880 in raise () from /lib/tls/i686/cmov/libc.so.6
#8 0xb6c67248 in abort () from /lib/tls/i686/cmov/libc.so.6
#9 0xb7ec3795 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb7ec3872 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb7ec3915 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb1942540 in ?? () from /usr/lib/libkmailprivate.so.4
#13 0xb19a45ea in ?? () from /usr/lib/libkmailprivate.so.4
#14 0xb17df114 in ?? () from /usr/lib/libkmailprivate.so.4
#15 0xb19acc39 in ?? () from /usr/lib/libkmailprivate.so.4
#16 0xb1a1ec60 in ?? () from /usr/lib/libkmailprivate.so.4
#17 0xb1a038ed in ?? () from /usr/lib/libkmailprivate.so.4
#18 0xb19d4624 in ?? () from /usr/lib/libkmailprivate.so.4
#19 0xb19c90ef in ?? () from /usr/lib/libkmailprivate.so.4
#20 0xb19bea6b in ?? () from /usr/lib/libkmailprivate.so.4
#21 0xb19bf1d7 in ?? () from /usr/lib/libkmailprivate.so.4
#22 0xb1b512bf in ?? () from /usr/lib/libkmailprivate.so.4
#23 0xb1b4f9c7 in ?? () from /usr/lib/libkmailprivate.so.4
#24 0xb7fd0a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#25 0xb7fd17e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#26 0xb7d35283 in KJob::result (this=0xb376f98, _t1=0xb376f98)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kdecore/kjob.moc:186
#27 0xb7d35792 in KJob::emitResult (this=0xb376f98)
at /build/buildd/kde4libs-4.1.3/kdecore/jobs/kjob.cpp:290
#28 0xb66108c5 in KIO::SimpleJob::slotFinished (this=0xb376f98)
at /build/buildd/kde4libs-4.1.3/kio/kio/job.cpp:498
#29 0xb6617353 in KIO::TransferJob::slotFinished (this=0xb376f98)
at /build/buildd/kde4libs-4.1.3/kio/kio/job.cpp:967
#30 0xb660e853 in KIO::SimpleJob::slotError (this=0xb376f98, err=149,
errorText=@0xbfad4090) at /build/buildd/kde4libs-4.1.3/kio/kio/job.cpp:510
#31 0xb660ea4b in KIO::SimpleJob::qt_metacall (this=0xb376f98,
_c=QMetaObject::InvokeMetaMethod, _id=0, _a=0xbfad3f48)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/jobclasses.moc:155
#32 0xb6617fea in KIO::TransferJob::qt_metacall (this=0xb376f98,
_c=QMetaObject::InvokeMetaMethod, _id=31, _a=0xbfad3f48)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/jobclasses.moc:324
#33 0xb7fd0a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#34 0xb7fd17e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#35 0xb66d6fb9 in KIO::SlaveInterface::error (this=0xa70fe98, _t1=149,
_t2=@0xbfad4090)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/slaveinterface.moc:149
#36 0xb66dac87 in KIO::SlaveInterface::dispatch (this=0xa70fe98, _cmd=102,
rawdata=@0xbfad40d4)
at /build/buildd/kde4libs-4.1.3/kio/kio/slaveinterface.cpp:212
#37 0xb66d76a7 in KIO::SlaveInterface::dispatch (this=0xa70fe98)
at /build/buildd/kde4libs-4.1.3/kio/kio/slaveinterface.cpp:90
#38 0xb66c76cd in KIO::Slave::gotInput (this=0xa70fe98)
at /build/buildd/kde4libs-4.1.3/kio/kio/slave.cpp:322
#39 0xb66ca113 in KIO::Slave::qt_metacall (this=0xa70fe98,
_c=QMetaObject::InvokeMetaMethod, _id=2, _a=0xbfad41e8)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/slave.moc:75
#40 0xb7fd0a60 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#41 0xb7fd17e2 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#42 0xb65d78f7 in KIO::Connection::readyRead (this=0x9925338)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/connection.moc:84
#43 0xb65d99c9 in KIO::ConnectionPrivate::dequeue (this=0xa744870)
at /build/buildd/kde4libs-4.1.3/kio/kio/connection.cpp:82
#44 0xb65d9b56 in KIO::Connection::qt_metacall (this=0x9925338,
_c=QMetaObject::InvokeMetaMethod, _id=1, _a=0xa5d8df0)
at /build/buildd/kde4libs-4.1.3/obj-i486-linux-gnu/kio/connection.moc:72
#45 0xb7fc9bfb in QMetaCallEvent::placeMetaCall ()
from /usr/lib/libQtCore.so.4
#46 0xb7fcb771 in QObject::event () from /usr/lib/libQtCore.so.4
#47 0xb6fc28ec in QApplicationPrivate::notify_helper ()
from /usr/lib/libQtGui.so.4
#48 0xb6fca72e in QApplication::notify () from /usr/lib/libQtGui.so.4
#49 0xb7abdb2d in KApplication::notify (this=0xbfad49c8, receiver=0x9925338,
event=0xa88cd50)
at /build/buildd/kde4libs-4.1.3/kdeui/kernel/kapplication.cpp:311
#50 0xb7fbbe61 in QCoreApplication::notifyInternal ()
from /usr/lib/libQtCore.so.4
#51 0xb7fbcae5 in QCoreApplicationPrivate::sendPostedEvents ()
from /usr/lib/libQtCore.so.4
#52 0xb7fbccdd in QCoreApplication::sendPostedEvents ()
from /usr/lib/libQtCore.so.4
#53 0xb7fe682f in ?? () from /usr/lib/libQtCore.so.4
#54 0xb6b976f8 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#55 0xb6b9ada3 in ?? () from /usr/lib/libglib-2.0.so.0
#56 0xb6b9af61 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#57 0xb7fe6478 in QEventDispatcherGlib::processEvents ()
from /usr/lib/libQtCore.so.4
#58 0xb705cea5 in ?? () from /usr/lib/libQtGui.so.4
#59 0xb7fba52a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#60 0xb7fba6ea in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#61 0xb7fbcda5 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#62 0xb6fc2767 in QApplication::exec () from /usr/lib/libQtGui.so.4
#63 0x0804bf52 in _start ()
#0 0xb80d5430 in __kernel_vsyscall ()