Version:            (using KDE KDE 3.5.2)
Installed from:    Ubuntu Packages

Scenario:
1. In Konqueror directory list I selected many rar files.
2. Right-clicked to open context menu and selected "Unpack to subdirectories" (or similar, I am using Polish locale).
3. Ark processes started and somewhere along the way Ark crashed, some files were not unpacked, some were.

Backtrace:
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Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
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[Thread debugging using libthread_db enabled]
[New Thread -1231694144 (LWP 8174)]
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[KCrash handler]
#6  0xb7d8563b in malloc_usable_size () from /lib/tls/i686/cmov/libc.so.6
#7  0xb7d86653 in free () from /lib/tls/i686/cmov/libc.so.6
#8  0xb7d88411 in malloc () from /lib/tls/i686/cmov/libc.so.6
#9  0xb7f28e26 in operator new () from /usr/lib/libstdc++.so.6
#10 0xb7f28f3d in operator new[] () from /usr/lib/libstdc++.so.6
#11 0xb760c0b0 in QString::setLength () from /usr/lib/libqt-mt.so.3
#12 0xb760c45c in QString::grow () from /usr/lib/libqt-mt.so.3
#13 0xb760e066 in QString::operatorPlusEqHelper () from /usr/lib/libqt-mt.so.3
#14 0xb760e146 in QString::operator+= () from /usr/lib/libqt-mt.so.3
#15 0xb6696b9e in Arch::slotReceivedOutput () from /usr/lib/kde3/libarkpart.so
#16 0xb669ef00 in Arch::qt_invoke () from /usr/lib/kde3/libarkpart.so
#17 0xb669f035 in RarArch::qt_invoke () from /usr/lib/kde3/libarkpart.so
#18 0xb72eee29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#19 0xb78ad2c3 in KProcess::receivedStdout () from /usr/lib/libkdecore.so.4
#20 0xb78ad466 in KProcess::childOutput () from /usr/lib/libkdecore.so.4
#21 0xb78ad499 in KProcess::slotChildOutput () from /usr/lib/libkdecore.so.4
#22 0xb791b0c1 in KProcess::commClose () from /usr/lib/libkdecore.so.4
#23 0xb78ad1dc in KProcess::processHasExited () from /usr/lib/libkdecore.so.4
#24 0xb78a70e4 in KProcessController::slotDoHousekeeping ()
   from /usr/lib/libkdecore.so.4
#25 0xb78a71f4 in KProcessController::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#26 0xb72eee29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#27 0xb72ef738 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#28 0xb7682bef in QSocketNotifier::activated () from /usr/lib/libqt-mt.so.3
#29 0xb730f16e in QSocketNotifier::event () from /usr/lib/libqt-mt.so.3
#30 0xb7284dc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#31 0xb7284fc2 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#32 0xb7951d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#33 0xb72160ef in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#34 0xb72768e3 in QEventLoop::activateSocketNotifiers ()
   from /usr/lib/libqt-mt.so.3
#35 0xb7229edb in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#36 0xb729da4f in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#37 0xb728387e in QApplication::processEvents () from /usr/lib/libqt-mt.so.3
#38 0xb72838a9 in QApplication::processEvents () from /usr/lib/libqt-mt.so.3
#39 0xb6d27ef6 in KProgressDialog::slotAutoShow () from /usr/lib/libkdeui.so.4
#40 0xb6df76e6 in KProgressDialog::qt_invoke () from /usr/lib/libkdeui.so.4
#41 0xb72eee29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#42 0xb72ef8c4 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#43 0xb7683f1e in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#44 0xb7313e21 in QTimer::event () from /usr/lib/libqt-mt.so.3
#45 0xb7284dc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#46 0xb7284fc2 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#47 0xb7951d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#48 0xb72160ef in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#49 0xb72767b3 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#50 0xb7229eff in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#51 0xb729da4f in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#52 0xb728387e in QApplication::processEvents () from /usr/lib/libqt-mt.so.3
#53 0xb72838a9 in QApplication::processEvents () from /usr/lib/libqt-mt.so.3
#54 0xb6d27ef6 in KProgressDialog::slotAutoShow () from /usr/lib/libkdeui.so.4
#55 0xb6df76e6 in KProgressDialog::qt_invoke () from /usr/lib/libkdeui.so.4
#56 0xb72eee29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#57 0xb72ef8c4 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#58 0xb7683f1e in QTimer::timeout () from /usr/lib/libqt-mt.so.3
#59 0xb7313e21 in QTimer::event () from /usr/lib/libqt-mt.so.3
#60 0xb7284dc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#61 0xb7284fc2 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#62 0xb7951d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#63 0xb72160ef in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#64 0xb72767b3 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#65 0xb7229eff in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#66 0xb729d8b7 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#67 0xb7283901 in QApplication::enter_loop () from /usr/lib/libqt-mt.so.3
#68 0xb7b1038b in KIO::NetAccess::enter_loop () from /usr/lib/libkio.so.4
#69 0xb7b68946 in KIO::NetAccess::mkdirInternal () from /usr/lib/libkio.so.4
#70 0xb7b868d2 in KIO::NetAccess::mkdir () from /usr/lib/libkio.so.4
#71 0xb66b077e in ArkWidget::extractTo () from /usr/lib/kde3/libarkpart.so
#72 0xb68307e1 in MainWindow::extractTo () from /usr/lib/libkdeinit_ark.so
#73 0xb6830d29 in ArkApplication::newInstance ()
   from /usr/lib/libkdeinit_ark.so
#74 0xb7963610 in KUniqueApplication::processDelayed ()
   from /usr/lib/libkdecore.so.4
#75 0xb7964d87 in KUniqueApplication::qt_invoke ()
   from /usr/lib/libkdecore.so.4
#76 0xb682c9ab in ArkApplication::qt_invoke () from /usr/lib/libkdeinit_ark.so
#77 0xb72eee29 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#78 0xb7681e1a in QSignal::signal () from /usr/lib/libqt-mt.so.3
#79 0xb730c5a0 in QSignal::activate () from /usr/lib/libqt-mt.so.3
#80 0xb7314090 in QSingleShotTimer::event () from /usr/lib/libqt-mt.so.3
#81 0xb7284dc6 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#82 0xb7284fc2 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#83 0xb7951d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#84 0xb72160ef in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3
#85 0xb72767b3 in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3
#86 0xb7229eff in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#87 0xb729d8b7 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#88 0xb729d7da in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#89 0xb72838d5 in QApplication::exec () from /usr/lib/libqt-mt.so.3
#90 0xb682f1bf in kdemain () from /usr/lib/libkdeinit_ark.so
#91 0xb7fa24f0 in kdeinitmain () from /usr/lib/kde3/ark.so
#92 0x0804e063 in ?? ()
#93 0x00000004 in ?? ()
#94 0x081465e0 in ?? ()
#95 0x00000001 in ?? ()
#96 0x00000000 in ?? ()