Version:           4.1.3 (using KDE 4.1.3)
Compiler:          gcc-4.3.2 
OS:                Linux
Installed from:    Gentoo Packages

Starting from an empty account list, I set up a disconnected IMAP account. After syncing of mail and managing subscriptions, I closed kmail.

Backtrace:
Application: KMail (kmail), signal SIGABRT
Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread 0xb45ac6d0 (LWP 8215)]
[New Thread 0xb187ab90 (LWP 8222)]
[KCrash handler]
#14 KMFolderNode::parent (this=0xbf9fc508)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/kmfoldernode.cpp:42
#15 0xb77d7e02 in ~ScheduledTask (this=0x9571568)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/jobscheduler.cpp:46
#16 0xb77d64fa in ~ScheduledCompactionTask (this=0x9571568)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/compactionjob.h:106
#17 0xb77d8436 in qDeleteAll<QList<KMail::ScheduledTask*>::const_iterator> (
    begin={i = 0xbf9fc57c}, end={i = 0xbf9fc578})
    at /usr/include/qt4/QtCore/qalgorithms.h:352
#18 0xb77d84a5 in qDeleteAll<QList<KMail::ScheduledTask*> > (c=@0x922a7d0)
    at /usr/include/qt4/QtCore/qalgorithms.h:360
#19 0xb77d7640 in ~JobScheduler (this=0x922a7c8)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/jobscheduler.cpp:63
#20 0xb7f039f2 in QObjectPrivate::deleteChildren (this=0x931e548)
    at kernel/qobject.cpp:1881
#21 0xb7f0cb8c in ~QObject (this=0xbf9fc70c) at kernel/qobject.cpp:890
#22 0xb7695d8a in ~KMKernel (this=0xbf9fc70c)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/kmkernel.cpp:193
#23 0x0804af41 in main (argc=)
    at /var/tmp/portage/kde-base/kmail-4.1.3/work/kmail-4.1.3/kmail/main.cpp:151
#0  0xb7fe2424 in __kernel_vsyscall ()