I'm getting a similar behavior. Ktorrent is repeatedly crashing when removing one or multiple completed torrents (I am not removing the data) from the upload section. On removal of multiple, some get removed while others linger after the application is restarted. On single removals, the torrents are not I am running the latest stable kubuntu (with ktorrent 2.2.0). The following plugins are enabled: -Bandwidth Scheduler (not used) -IP Filter (using http://www.bluetack.co.uk/config/psplist.zip) -Import -Info Widget -Log Viewer -Scan Folder -Search -Statistics -UPnP -Web Interface (not used) -Zeroconf This has happened on existing and new torrents, but every time. Here is the backtrace: (no debugging symbols found) Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1". [Thread debugging using libthread_db enabled] [New Thread -1234372912 (LWP 21060)] [New Thread -1630618736 (LWP 22528)] [New Thread -1622226032 (LWP 22527)] [New Thread -1600181360 (LWP 22526)] [New Thread -1591788656 (LWP 22525)] 0xffffe410 in __kernel_vsyscall () #0 0xffffe410 in __kernel_vsyscall () #1 0xb699218b in ?? () from /lib/tls/i686/cmov/libpthread.so.0 #2 0xb74f2bee in _kde_IceTransSocketRead (ciptr=0x8112f70, buf=0x8113548 "\002\003", size=8) at /build/buildd/kdelibs-3.5.6/./dcop/KDE-ICE/Xtranssock.c:1710 #3 0xb74f289f in _kde_IceTransRead (ciptr=0x8112f70, buf=0x8113548 "\002\003", size=8) at /build/buildd/kdelibs-3.5.6/./dcop/KDE-ICE/Xtrans.c:845 #4 0xb74ec71f in _kde_IceRead (iceConn=0x8113480, nbytes=8, ptr=0x8113548 "\002\003") at /build/buildd/kdelibs-3.5.6/./dcop/KDE-ICE/misc.c:249 #5 0xb74f0f0f in KDE_IceProcessMessages (iceConn=0x8113480, replyWait=0xbfce43f8, replyReadyRet=0xbfce4448) at /build/buildd/kdelibs-3.5.6/./dcop/KDE-ICE/process.c:153 #6 0xb74dc669 in DCOPClient::callInternal (this=0x8112140, remApp=@0xbfce4714, remObjId=@0xbfce4714, remFun=@0xbfce4754, data=@0xbfce472c, replyStruct=0xbfce44a4, useEventLoop=false, timeout=-1, minor_opcode=2) at /build/buildd/kdelibs-3.5.6/./dcop/dcopclient.cpp:1931 #7 0xb74dc94d in DCOPClient::callInternal (this=0x8112140, remApp=@0xbfce4714, remObjId=@0xbfce4714, remFun=@0xbfce4754, data=@0xbfce472c, replyType=@0xbfce471c, replyData=@0xbfce4724, useEventLoop=false, timeout=-1, minor_opcode=2) at /build/buildd/kdelibs-3.5.6/./dcop/dcopclient.cpp:1821 #8 0xb74e1397 in DCOPClient::call (this=0x8112140, remApp=@0xbfce4714, remObjId=@0xbfce4714, remFun=@0xbfce4754, data=@0xbfce472c, replyType=@0xbfce471c, replyData=@0xbfce4724, useEventLoop=false, timeout=-1) at /build/buildd/kdelibs-3.5.6/./dcop/dcopclient.cpp:1765 #9 0xb74e13f7 in DCOPClient::call (this=0x8112140, remApp=@0xbfce4714, remObjId=@0xbfce4714, remFun=@0xbfce4754, data=@0xbfce472c, replyType=@0xbfce471c, replyData=@0xbfce4724, useEventLoop=false) at /build/buildd/kdelibs-3.5.6/./dcop/dcopclient.cpp:1730 #10 0xb7b9a7e8 in KIO::Slave::createSlave (protocol=@0x84f3a38, url=@0x8bb15f8, error=@0xbfce4814, error_text=@0xbfce4810) at /build/buildd/kdelibs-3.5.6/./kio/kio/slave.cpp:435 #11 0xb7bcbcf3 in KIO::Scheduler::createSlave (this=0x81a46a8, protInfo=0x84f39f0, job=0x8bb1580, url=@0x8bb15f8) at /build/buildd/kdelibs-3.5.6/./kio/kio/scheduler.cpp:539 #12 0xb7be839e in KIO::Scheduler::startJobScheduled (this=0x81a46a8, protInfo=0x84f39f0) at /build/buildd/kdelibs-3.5.6/./kio/kio/scheduler.cpp:386 #13 0xb7be847f in KIO::Scheduler::startStep (this=0x81a46a8) at /build/buildd/kdelibs-3.5.6/./kio/kio/scheduler.cpp:278 #14 0xb7be9afc in KIO::Scheduler::qt_invoke (this=0x81a46a8, _id=4, _o=0xbfce497c) at ./scheduler.moc:161 #15 0xb6f6488b in QObject::activate_signal () from /usr/lib/libqt-mt.so.3 #16 0xb6f65330 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3 #17 0xb72f2ba6 in QTimer::timeout () from /usr/lib/libqt-mt.so.3 #18 0xb6f8c596 in QTimer::event () from /usr/lib/libqt-mt.so.3 #19 0xb6efba60 in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3 #20 0xb6efd88f in QApplication::notify () from /usr/lib/libqt-mt.so.3 #21 0xb76bfce2 in KApplication::notify (this=0xbfce5df4, receiver=0x81a46d0, event=0xbfce4ca8) at /build/buildd/kdelibs-3.5.6/./kdecore/kapplication.cpp:550 #22 0xb6e8e1e9 in QApplication::sendEvent () from /usr/lib/libqt-mt.so.3 #23 0xb6eee4ab in QEventLoop::activateTimers () from /usr/lib/libqt-mt.so.3 #24 0xb6ea2d25 in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3 #25 0xb6f16136 in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3 #26 0xb6efd587 in QApplication::enter_loop () from /usr/lib/libqt-mt.so.3 #27 0xb7b86025 in KIO::NetAccess::enter_loop (this=0xbfce5000) at /build/buildd/kdelibs-3.5.6/./kio/kio/netaccess.cpp:498 #28 0xb7bbfcc3 in KIO::NetAccess::synchronousRunInternal (this=0xbfce5000, job=0x8e3b368, window=0x0, data=0x0, finalURL=0x0, metaData=0x0) at /build/buildd/kdelibs-3.5.6/./kio/kio/netaccess.cpp:479 #29 0xb7bc9c00 in KIO::NetAccess::synchronousRun (job=0x8e3b368, window=0x0, data=0x0, finalURL=0x0, metaData=0x0) at /build/buildd/kdelibs-3.5.6/./kio/kio/netaccess.cpp:277 #30 0xb7ec7a4d in bt::WaitJob::execute () from /usr/lib/libktorrent-2.2.so #31 0x08076958 in ?? () #32 0x0806fd32 in ?? () #33 0xb788ae30 in KMainWindow::shuttingDown (this=0x8) at /build/buildd/kdelibs-3.5.6/./kdeui/kmainwindow.cpp:1104 #34 0xb79ea031 in KMainWindow::qt_invoke (this=0x81aa0d0, _id=72, _o=0xbfce521c) at ./kmainwindow.moc:139 #35 0xb7dde943 in KParts::MainWindow::qt_invoke (this=0x81aa0d0, _id=72, _o=0xbfce521c) at ./mainwindow.moc:98 #36 0x080c1ac3 in ?? () #37 0x081aa0d0 in ?? () #38 0x00000048 in ?? () #39 0xbfce521c in ?? () #40 0x00000048 in ?? () #41 0xbfce521c in ?? () #42 0x081aa0d0 in ?? () #43 0xbfce5188 in ?? () #44 0x08072c40 in ?? () Backtrace stopped: previous frame identical to this frame (corrupt stack?)