Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb648bb90 (LWP 16261)]
0xb74bea23 in QIODevice::write () from /usr/lib/libQtCore.so.4
(gdb) bt 
#0  0xb74bea23 in QIODevice::write () from /usr/lib/libQtCore.so.4
#1  0x08052eee in ServerThread::addClient (this=0x809f7f0)
    at serverthread.cpp:48
#2  0x08053217 in ServerThread::run (this=0x809f7f0) at serverthread.cpp:32
#3  0xb746c507 in ?? () from /usr/lib/libQtCore.so.4
#4  0x0809f7f0 in ?? ()
#5  0x00000000 in ?? ()