I was creating a sample program to report another bug with QFtp.
But I run into QFtp crashing when the program read()s too small amounts of data compared to the download speed.

(gdb) bt
#0 memcpy () at ../sysdeps/i386/i686/memcpy.S:100
#1 0xb741810a in ?? () from /usr/lib/libQtNetwork.so.4
#2 0x0804a001 in Program::read (this=0x8ee05f4f) at program.cpp:87

Usage:
./program ftp://ftp.qt.nokia.com/qt/source/qt-1.41.tar.gz