Application: kmail (1.99.0)
KDE Platform Version: 4.4.80 (KDE 4.4.80 (KDE 4.5 Beta1)) (Compiled from sources)
Qt Version: 4.6.2
Operating System: Linux 2.6.31-21-generic x86_64
Distribution: Ubuntu 9.10

-- Information about the crash:
As the title says, I think I switched to a different collection while another one was still getting grouped/threaded. Apparently the storage model got invalidated (i.e. couldn't return a mail for the row anymore) and hence lead to this assert.

-- Backtrace:
Application: KMail (kmail), signal: Aborted
The current source language is "auto; currently c".
[Current thread is 1 (Thread 0x7fb0e826f750 (LWP 16602))]

Thread 2 (Thread 0x7fb0cbc9f910 (LWP 16616)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007fb0db2da816 in ?? () from /usr/lib/libQtWebKit.so.4
#2  0x00007fb0db2da859 in ?? () from /usr/lib/libQtWebKit.so.4
#3  0x00007fb0e2223a04 in start_thread (arg=<value optimized out>) at pthread_create.c:300
#4  0x00007fb0e17e280d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fb0e826f750 (LWP 16602)):
[KCrash Handler]
#6  0x00007fb0e17364b5 in *__GI_raise (sig=<value optimized out>) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#7  0x00007fb0e1739f50 in *__GI_abort () at abort.c:92
#8  0x00007fb0e24aa864 in qt_message_output (msgType=QtFatalMsg, buf=<value optimized out>) at global/qglobal.cpp:2250
#9  0x00007fb0e24aaa42 in qt_message (msgType=QtFatalMsg, msg=0x7fb0e2607f08 "ASSERT: \"%s\" in file %s, line %d", ap=0x7fff7502ffc0) at global/qglobal.cpp:2296
#10 0x00007fb0e24aabf5 in qFatal (msg=0x40da <Address 0x40da out of bounds>) at global/qglobal.cpp:2479
#11 0x00007fb0deb35b0c in MessageList::StorageModel::updateMessageItemData (this=0x27e69e30, mi=0x27ecf7b0, row=0) at /home/speedy/projects/kde4/kdepim/messagelist/storagemodel.cpp:292
#12 0x00007fb0dead9c7c in MessageList::Core::ModelPrivate::viewItemJobStepInternalForJobPass1Update (this=0xc62650, job=0x287cdbf0, tStart=...)
    at /home/speedy/projects/kde4/kdepim/messagelist/core/model.cpp:3215
#13 0x00007fb0deada3dd in MessageList::Core::ModelPrivate::viewItemJobStepInternalForJob (this=0xc62650, job=0x287cdbf0, tStart=...)
    at /home/speedy/projects/kde4/kdepim/messagelist/core/model.cpp:3392
#14 0x00007fb0deadab2a in MessageList::Core::ModelPrivate::viewItemJobStepInternal (this=0xc62650) at /home/speedy/projects/kde4/kdepim/messagelist/core/model.cpp:3718
#15 0x00007fb0deadb525 in MessageList::Core::ModelPrivate::viewItemJobStep (this=0xc62650) at /home/speedy/projects/kde4/kdepim/messagelist/core/model.cpp:3933
#16 0x00007fb0deadd64c in MessageList::Core::Model::qt_metacall (this=0xc615d0, _c=QMetaObject::InvokeMetaMethod, _id=2, _a=0x7fff75030840)
    at /home/speedy/projects/.build/kde4/kdepim/messagelist/model.moc:90
#17 0x00007fb0e25b9c0f in QMetaObject::activate (sender=0xc62688, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0xffffffffffffffff) at kernel/qobject.cpp:3293
#18 0x00007fb0e25b6863 in QObject::event (this=0xc62688, e=0x7fff75030fc0) at kernel/qobject.cpp:1212
#19 0x00007fb0e350212c in QApplicationPrivate::notify_helper (this=0x763680, receiver=0xc62688, e=0x7fff75030fc0) at kernel/qapplication.cpp:4300
#20 0x00007fb0e350871b in QApplication::notify (this=0x7fff750313b0, receiver=0xc62688, e=0x7fff75030fc0) at kernel/qapplication.cpp:4183
#21 0x00007fb0e7be98ab in KApplication::notify (this=0x7fff750313b0, receiver=0xc62688, event=0x7fff75030fc0) at /home/speedy/projects/kde4/kdelibs/kdeui/kernel/kapplication.cpp:302
#22 0x00007fb0e25a6e0c in QCoreApplication::notifyInternal (this=0x7fff750313b0, receiver=0xc62688, event=0x7fff75030fc0) at kernel/qcoreapplication.cpp:704
#23 0x00007fb0e25d3a62 in QCoreApplication::sendEvent (this=0x766eb0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#24 QTimerInfoList::activateTimers (this=0x766eb0) at kernel/qeventdispatcher_unix.cpp:603
#25 0x00007fb0e25d0668 in timerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#26 idleTimerSourceDispatch (source=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:231
#27 0x00007fb0d857ebce in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#28 0x00007fb0d8582598 in ?? () from /lib/libglib-2.0.so.0
#29 0x00007fb0d85826c0 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#30 0x00007fb0e25d0333 in QEventDispatcherGlib::processEvents (this=0x72a970, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#31 0x00007fb0e35b1f0e in QGuiEventDispatcherGlib::processEvents (this=0x40da, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#32 0x00007fb0e25a5732 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#33 0x00007fb0e25a5b0c in QEventLoop::exec (this=0x7fff75031260, flags=) at kernel/qeventloop.cpp:201
#34 0x00007fb0e25a984b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#35 0x0000000000403913 in main (argc=1, argv=0x7fff75031548) at /home/speedy/projects/kde4/kdepim/kmail/main.cpp:147
The current source language is "auto; currently asm".
The current source language is "auto; currently c".

Reported using DrKonqi