Version:           3.1.1 (using 4.1.00 (KDE 4.1.0), Debian packages)
Compiler:          cc
OS:                Linux (i686) release 2.6.25-2-686-bigmem

I'm ruinning lot of torrents in ktorrent usually, but I tired with only 2-3 torrents, and the same happens.
It works fine for about two or three weaks, then it starts to eat memory dramatically. After allocing 2-3 GB it crashes.
I've already noticed this with older versions too.

Backtrace:

Application: KTorrent (ktorrent), signal SIGABRT
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[Thread debugging using libthread_db enabled]
[New Thread 0xb5df1700 (LWP 18081)]
[New Thread 0xb3969b90 (LWP 18160)]
[New Thread 0xb2465b90 (LWP 18159)]
[New Thread 0xb44b0b90 (LWP 18082)]
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0xb7fa0424 in __kernel_vsyscall ()
[Current thread is 0 (LWP 18081)]

Thread 4 (Thread 0xb44b0b90 (LWP 18082)):
#0  0xb7fa0424 in __kernel_vsyscall ()
#1  0xb67cc931 in select () from /lib/i686/cmov/libc.so.6
#2  0xb6a95a10 in ?? () from /usr/local/lib/libQtCore.so.4
#3  0xb69c7322 in ?? () from /usr/local/lib/libQtCore.so.4
#4  0xb61524c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#5  0xb67d455e in clone () from /lib/i686/cmov/libc.so.6

Thread 3 (Thread 0xb2465b90 (LWP 18159)):
#0  0xb7fa0424 in __kernel_vsyscall ()
#1  0xb6156352 in pthread_cond_timedwait@@GLIBC_2.3.2 ()
   from /lib/i686/cmov/libpthread.so.0
#2  0xb67e26f4 in pthread_cond_timedwait () from /lib/i686/cmov/libc.so.6
#3  0xb69c6d3e in ?? () from /usr/local/lib/libQtCore.so.4
#4  0xb69c6e6b in QThread::msleep () from /usr/local/lib/libQtCore.so.4
#5  0xb7e4185e in ?? () from /usr/local/lib/libbtcore.so.7p
#6  0xb7e42138 in ?? () from /usr/local/lib/libbtcore.so.7p
#7  0xb69c7322 in ?? () from /usr/local/lib/libQtCore.so.4
#8  0xb61524c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#9  0xb67d455e in clone () from /lib/i686/cmov/libc.so.6

Thread 2 (Thread 0xb3969b90 (LWP 18160)):
#0  0xb7fa0424 in __kernel_vsyscall ()
#1  0xb6156025 in pthread_cond_wait@@GLIBC_2.3.2 ()
   from /lib/i686/cmov/libpthread.so.0
#2  0xb67e269d in pthread_cond_wait () from /lib/i686/cmov/libc.so.6
#3  0xb69c8332 in QWaitCondition::wait () from /usr/local/lib/libQtCore.so.4
#4  0xb7e4102e in ?? () from /usr/local/lib/libbtcore.so.7p
#5  0xb7e42138 in ?? () from /usr/local/lib/libbtcore.so.7p
#6  0xb69c7322 in ?? () from /usr/local/lib/libQtCore.so.4
#7  0xb61524c0 in start_thread () from /lib/i686/cmov/libpthread.so.0
#8  0xb67d455e in clone () from /lib/i686/cmov/libc.so.6

Thread 1 (Thread 0xb5df1700 (LWP 18081)):
#0  0xb7fa0424 in __kernel_vsyscall ()
#1  0xb678fe26 in nanosleep () from /lib/i686/cmov/libc.so.6
#2  0xb678fc3f in sleep () from /lib/i686/cmov/libc.so.6
#3  0xb7a5b678 in ?? () from /usr/local/lib/libkdeui.so.5
#4  0x00000000 in ?? ()
#0  0xb7fa0424 in __kernel_vsyscall ()