Application that crashed: ark
Version of the application: 2.13
KDE Version: 4.3.1 (KDE 4.3.1)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic i686
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
1) Click on a tar.bz2 file
2) while the file is loading in ark, click on close
3) ark crashes. and this is reproducible.

 -- Backtrace:
Application: Ark (ark), signal: Aborted
[Current thread is 0 (LWP 12937)]

Thread 2 (Thread 0xb41bab90 (LWP 12938)):
[KCrash Handler]
#6  0xb7f40430 in __kernel_vsyscall ()
#7  0xb65946d0 in raise () from /lib/tls/i686/cmov/libc.so.6
#8  0xb6596098 in abort () from /lib/tls/i686/cmov/libc.so.6
#9  0xb65d224d in ?? () from /lib/tls/i686/cmov/libc.so.6
#10 0xb65d8604 in ?? () from /lib/tls/i686/cmov/libc.so.6
#11 0xb65db5b6 in ?? () from /lib/tls/i686/cmov/libc.so.6
#12 0xb65dbfbf in ?? () from /lib/tls/i686/cmov/libc.so.6
#13 0xb65dcee6 in realloc () from /lib/tls/i686/cmov/libc.so.6
#14 0xb683a894 in qRealloc (ptr=0xa0d1bc8, size=32) at global/qmalloc.cpp:65
#15 0xb6865515 in QListData::realloc (this=0xb41b9f98, alloc=3) at tools/qlistdata.cpp:111
#16 0xb6865783 in QListData::append (this=0xb41b9f98) at tools/qlistdata.cpp:131
#17 0xb6847a8b in QList<QByteArray>::append (this=0xb41b9f98, t=@0xb41b9f28) at ../../include/QtCore/../../src/corelib/tools/qlist.h:429
#18 0xb693bc49 in QMetaMethod::parameterTypes (this=0xb41b9f90) at ../../include/QtCore/../../src/corelib/tools/qlist.h:302
#19 0xb69463a3 in queued_activate (sender=0xa0600c0, signal=28, c=@0xa061600, argv=0xb41ba06c, semaphore=0x0) at kernel/qobject.cpp:2990
#20 0xb694a0d7 in QMetaObject::activate (sender=0xa0600c0, from_signal_index=28, to_signal_index=28, argv=0xb41ba06c) at kernel/qobject.cpp:3086
#21 0xb694ae42 in QMetaObject::activate (sender=0xa0600c0, m=0xb7f1b0ec, local_signal_index=2, argv=0xb41ba06c) at kernel/qobject.cpp:3187
#22 0xb7efe343 in Kerfuffle::Job::newEntry () from /usr/lib/libkerfuffle.so.4
#23 0xb7efe384 in Kerfuffle::Job::onEntry () from /usr/lib/libkerfuffle.so.4
#24 0xb7efe092 in Kerfuffle::ReadOnlyArchiveInterface::entry () from /usr/lib/libkerfuffle.so.4
#25 0xb42fd9aa in ?? () from /usr/lib/kde4/kerfuffle_libarchive.so
#26 0xb42fdf81 in ?? () from /usr/lib/kde4/kerfuffle_libarchive.so
#27 0xb7eff165 in Kerfuffle::ListJob::doWork () from /usr/lib/libkerfuffle.so.4
#28 0xb7f02659 in ?? () from /usr/lib/libkerfuffle.so.4
#29 0xb6840132 in QThreadPrivate::start (arg=0xa0d24d8) at thread/qthread_unix.cpp:188
#30 0xb62b14ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#31 0xb664d49e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5e879e0 (LWP 12937)):
#0  0xb7f40430 in __kernel_vsyscall ()
#1  0xb62b50e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb665c2ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb6841172 in QWaitCondition::wait (this=0xa0eb078, mutex=0xa0eb064, time=4294967295) at thread/qwaitcondition_unix.cpp:87
#4  0xb68402d3 in QThread::wait (this=0xa05ed18, time=4294967295) at thread/qthread_unix.cpp:484
#5  0xb7efeada in Kerfuffle::Job::~Job () from /usr/lib/libkerfuffle.so.4
#6  0xb7f0231f in ?? () from /usr/lib/libkerfuffle.so.4
#7  0xb6943e0f in QObjectPrivate::deleteChildren (this=0xa0d9b30) at kernel/qobject.cpp:1847
#8  0xb694b763 in ~QObject (this=0xa0618a8) at kernel/qobject.cpp:836
#9  0xb7f02f69 in Kerfuffle::ArchiveBase::~ArchiveBase () from /usr/lib/libkerfuffle.so.4
#10 0xb47a5fdd in ?? () from /usr/lib/kde4/libarkpart.so
#11 0xb6943e0f in QObjectPrivate::deleteChildren (this=0x9f223e0) at kernel/qobject.cpp:1847
#12 0xb694b763 in ~QObject (this=0x9f3fe00) at kernel/qobject.cpp:836
#13 0xb7e391de in ~Part (this=0x9f3fe00, __vtt_parm=0xb47b308c) at /build/buildd/kde4libs-4.3.1/kparts/part.cpp:212
#14 0xb7e3950a in ~ReadOnlyPart (this=0x9f3fe00, __vtt_parm=0xb47b3088) at /build/buildd/kde4libs-4.3.1/kparts/part.cpp:459
#15 0xb7e3966f in ~ReadWritePart (this=0x9f3fe00, __vtt_parm=0xb47b3084) at /build/buildd/kde4libs-4.3.1/kparts/part.cpp:721
#16 0xb4797b9a in ?? () from /usr/lib/kde4/libarkpart.so
#17 0x08051467 in _start ()

Reported using DrKonqi