Application: ktorrent (4.1.1)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic-pae i686
Distribution: Ubuntu 11.10

-- Information about the crash:
- Custom settings of the application:
full standart Qt: 4.7.4
KDE Development Platform: 4.7.3 (4.7.3)
KTorrent: 4.1.1
- in konsole: 
nezus@nezus-901C372:~$ ktorrent
KGlobal::locale::Warning your global KLocale is being recreated with a valid main component instead of a fake component, this usually means you tried to call i18n related functions before your main component was created. You should not do that since it most likely will not work 

unnamed app(2374): Communication problem with  "ktorrent" , it probably crashed. 
Error message was:  "org.freedesktop.DBus.Error.UnknownObject" : " "No such object path '/MainApplication'" " 

nezus@nezus-901C372:~$ 
nezus@nezus-901C372:~$ Warning: Qt has caught an exception thrown from an event handler. Throwing
exceptions from an event handler is not supported in Qt. You must
reimplement QApplication::notify() and catch all exceptions there.

ktorrent: malloc.c:3551: munmap_chunk: Assertion `ret == 0' failed.
KCrash: Application 'ktorrent' crashing...
KCrash: Attempting to start /usr/lib/kde4/libexec/drkonqi from kdeinit
sock_file=/home/nezus/.kde/socket-nezus-901C372/kdeinit4__0
Warning: QSocketNotifier: Invalid socket 36 and type 'Read', disabling...
Warning: QSocketNotifier: Invalid socket 37 and type 'Read', disabling...

The crash can be reproduced every time.

-- Backtrace:
Application: KTorrent (ktorrent), signal: Aborted
[Current thread is 1 (Thread 0xb4341a00 (LWP 2375))]

Thread 3 (Thread 0xb2fe9b70 (LWP 2377)):
#0  0xb4d1a6c0 in g_main_context_prepare () from /lib/i386-linux-gnu/libglib-2.0.so.0
#1  0xb4d1b637 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb4d1bc2a in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb677ab37 in QEventDispatcherGlib::processEvents (this=0x9da46e8, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#4  0xb674b1dd in QEventLoop::processEvents (this=0xb2fe92e0, flags=...) at kernel/qeventloop.cpp:149
#5  0xb674b421 in QEventLoop::exec (this=0xb2fe92e0, flags=...) at kernel/qeventloop.cpp:201
#6  0xb664e90b in QThread::exec (this=0x9d75568) at thread/qthread.cpp:498
#7  0xb765de7d in utp::UTPServerThread::run (this=0x9d75568) at ../../src/utp/utpserverthread.cpp:41
#8  0xb66517b3 in QThreadPrivate::start (arg=0x9d75568) at thread/qthread_unix.cpp:331
#9  0xb4f2fd31 in start_thread (arg=0xb2fe9b70) at pthread_create.c:304
#10 0xb59420ce in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 2 (Thread 0xb25ffb70 (LWP 2378)):
#0  0xb770e424 in __kernel_vsyscall ()
#1  0xb593340e in __GI___poll (fds=0x9ddd1c8, nfds=2, timeout=500) at ../sysdeps/unix/sysv/linux/poll.c:87
#2  0xb75b7b07 in net::Poll::poll (this=0xb25ff27c, timeout=500) at ../../src/net/poll.cpp:99
#3  0xb7624019 in dht::RPCServer::Private::run (this=0x9ddc7c8) at ../../src/dht/rpcserver.cpp:95
#4  0xb66517b3 in QThreadPrivate::start (arg=0x9ddc7c8) at thread/qthread_unix.cpp:331
#5  0xb4f2fd31 in start_thread (arg=0xb25ffb70) at pthread_create.c:304
#6  0xb59420ce in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130
Backtrace stopped: Not enough registers or memory available to unwind further

Thread 1 (Thread 0xb4341a00 (LWP 2375)):
[KCrash Handler]
#7  0xb770e424 in __kernel_vsyscall ()
#8  0xb589dc8f in __GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#9  0xb58a12b5 in __GI_abort () at abort.c:92
#10 0xb58ddf09 in __malloc_assert (assertion=<optimized out>, file=<optimized out>, line=3551, function=0xb59a9b4b "munmap_chunk") at malloc.c:351
#11 0xb58dedf1 in munmap_chunk (p=<optimized out>) at malloc.c:3551
#12 0xb664ae2b in qFree (ptr=0x6ace6008) at global/qmalloc.cpp:60
#13 0xb669c032 in QString::free (d=0x6ace6008) at tools/qstring.cpp:1186
#14 0xb6a37491 in ~QString (this=0xbffaf568, __in_chrg=<optimized out>) at /usr/include/qt4/QtCore/qstring.h:883
#15 KCatalog::catalogLocaleDir (name=..., language=...) at ../../kdecore/localization/kcatalog.cpp:153
#16 0xb6a52c54 in KLocalePrivate::updateCatalogs (this=0x9cb71d8) at ../../kdecore/localization/klocale_kde.cpp:852
#17 0xb6a50442 in KLocalePrivate::removeCatalog (this=0x9cb71d8, catalog=...) at ../../kdecore/localization/klocale_kde.cpp:877
#18 0xb6a4574a in KLocale::removeCatalog (this=0x9cb6108, catalog=...) at ../../kdecore/localization/klocale.cpp:143
#19 0xb69b9686 in ~KComponentDataPrivate (this=0x9d0f248, __in_chrg=<optimized out>) at ../../kdecore/kernel/kcomponentdata_p.h:54
#20 deref (this=0x9d0f248) at ../../kdecore/kernel/kcomponentdata_p.h:74
#21 deref (this=0x9d0f248) at ../../kdecore/kernel/kcomponentdata.cpp:120
#22 KComponentData::~KComponentData (this=0x9d248d0, __in_chrg=<optimized out>) at ../../kdecore/kernel/kcomponentdata.cpp:123
#23 0xb3dfb236 in Oxygen::Helper::~Helper (this=0x9d24880, __in_chrg=<optimized out>) at ../../../libs/oxygen/oxygenhelper.h:161
#24 0xb3dfbe22 in Oxygen::StyleHelper::~StyleHelper (this=0x9d24880, __in_chrg=<optimized out>) at ../../../kstyles/oxygen/oxygenstylehelper.h:59
#25 0xb3dc1e71 in Oxygen::Style::~Style (this=0x9d151c8, __in_chrg=<optimized out>) at ../../../kstyles/oxygen/oxygenstyle.cpp:195
#26 0xb3dc1ed2 in Oxygen::Style::~Style (this=0x9d151c8, __in_chrg=<optimized out>) at ../../../kstyles/oxygen/oxygenstyle.cpp:195
#27 0xb5c827ed in QApplication::~QApplication (this=0xbffaf850, __in_chrg=<optimized out>) at kernel/qapplication.cpp:1168
#28 0xb6d35378 in KApplication::~KApplication (this=0xbffaf850, __in_chrg=<optimized out>) at ../../kdeui/kernel/kapplication.cpp:894
#29 0xb6d3d0f8 in KUniqueApplication::~KUniqueApplication (this=0xbffaf850, __in_chrg=<optimized out>) at ../../kdeui/kernel/kuniqueapplication.cpp:347
#30 0x08068871 in main (argc=) at ../../ktorrent/main.cpp:175

Reported using DrKonqi