Version:           1.11.4 (using KDE 4.2.4)
Compiler:          2.6.28-11 
OS:                Linux
Installed from:    Ubuntu Packages

This error is with the situation resolved, but it happened to me today, 14/06/2009 to 16:10, using KDE 4.2.4. Below details of the error:

Aplicativo: KMail (kmail), sinal SIGABRT
[Current thread is 0 (LWP 5884)]

Thread 5 (Thread 0xac608b90 (LWP 6976)):
#0  0xb7fd5430 in __kernel_vsyscall ()
#1  0xb5c0f7b1 in select () from /lib/tls/i686/cmov/libc.so.6
#2  0xb5ee3380 in ?? () from /usr/lib/libQtCore.so.4
#3  0xb5e1196e in ?? () from /usr/lib/libQtCore.so.4
#4  0xb50404ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#5  0xb5c1749e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 4 (Thread 0xaaf5cb90 (LWP 7136)):
#0  0xb7fd5430 in __kernel_vsyscall ()
#1  0xb5044412 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb5c26344 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xabb48ae3 in ?? () from /usr/lib/libxine.so.1

Thread 3 (Thread 0xaa6e0b90 (LWP 7137)):
#0  0xb433a732 in g_main_context_check () from /usr/lib/libglib-2.0.so.0
#1  0xb433afdd in ?? () from /usr/lib/libglib-2.0.so.0
#2  0xb433b268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#3  0xb5f31457 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#4  0xb5f0406a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#5  0xb5f044aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#6  0xb5e0e639 in QThread::exec () from /usr/lib/libQtCore.so.4
#7  0xabb9620a in ?? () from /usr/lib/kde4/plugins/phonon_backend/phonon_xine.so
#8  0xb5e1196e in ?? () from /usr/lib/libQtCore.so.4
#9  0xb50404ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#10 0xb5c1749e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa4fa8b90 (LWP 7157)):
#0  0xb7fd5430 in __kernel_vsyscall ()
#1  0xb5044412 in pthread_cond_timedwait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb5c26344 in pthread_cond_timedwait () from /lib/tls/i686/cmov/libc.so.6
#3  0xabb48ae3 in ?? () from /usr/lib/libxine.so.1

Thread 1 (Thread 0xb3c36b40 (LWP 5884)):
[KCrash Handler]
#6  0xb7fd5430 in __kernel_vsyscall ()
#7  0xb5b5e6d0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb5b60098 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb5e09595 in qt_message_output () from /usr/lib/libQtCore.so.4
#10 0xb5e09681 in qFatal () from /usr/lib/libQtCore.so.4
#11 0xb5e09775 in qt_assert () from /usr/lib/libQtCore.so.4
#12 0xb773690b in ?? () from /usr/lib/libkmailprivate.so.4
#13 0xb773bb3f in ?? () from /usr/lib/libkmailprivate.so.4
#14 0xb7796498 in ?? () from /usr/lib/libkmailprivate.so.4
#15 0xb6209991 in QWidget::event () from /usr/lib/libQtGui.so.4
#16 0xb65e3993 in QFrame::event () from /usr/lib/libQtGui.so.4
#17 0xb668394f in QAbstractScrollArea::viewportEvent () from /usr/lib/libQtGui.so.4
#18 0xb6735647 in QAbstractItemView::viewportEvent () from /usr/lib/libQtGui.so.4
#19 0xb67700c4 in QTreeView::viewportEvent () from /usr/lib/libQtGui.so.4
#20 0xb6685f55 in ?? () from /usr/lib/libQtGui.so.4
#21 0xb5f04c5a in QCoreApplicationPrivate::sendThroughObjectEventFilters () from /usr/lib/libQtCore.so.4
#22 0xb61b2e7a in QApplicationPrivate::notify_helper () from /usr/lib/libQtGui.so.4
#23 0xb61bbb11 in QApplication::notify () from /usr/lib/libQtGui.so.4
#24 0xb7e12e0d in KApplication::notify () from /usr/lib/libkdeui.so.5
#25 0xb5f05a3b in QCoreApplication::notifyInternal () from /usr/lib/libQtCore.so.4
#26 0xb61bab7e in QApplicationPrivate::sendMouseEvent () from /usr/lib/libQtGui.so.4
#27 0xb622a97e in ?? () from /usr/lib/libQtGui.so.4
#28 0xb6229ca7 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#29 0xb6254c6a in ?? () from /usr/lib/libQtGui.so.4
#30 0xb4337b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#31 0xb433b0eb in ?? () from /usr/lib/libglib-2.0.so.0
#32 0xb433b268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#33 0xb5f31438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#34 0xb6254365 in ?? () from /usr/lib/libQtGui.so.4
#35 0xb5f0406a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#36 0xb5f044aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#37 0xb5f06959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#38 0xb61b2d17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#39 0x0804a7a0 in _start ()