.
Thread 2 (process 4542):
#0  0x00007f720ce383c2 in select () from /lib/libc.so.6
No symbol table info available.
#1  0x00007f720dbb9f31 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#2  0x00007f720daf4445 in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#3  0x00007f720d880a04 in start_thread () from /lib/libpthread.so.0
No symbol table info available.
#4  0x00007f720ce3f7bd in clone ()
    at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
No locals.
#5  0x0000000000000000 in ?? ()
No symbol table info available.
.
Thread 1 (process 4541):
#0  0x00007f720db375f8 in QString::fromLocal8Bit ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#1  0x00007f720dbdbcbc in QCoreApplication::arguments ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#2  0x00007f720e0deb91 in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#3  0x00007f720e0df929 in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#4  0x00007f720bf1b4ef in _SmcProcessMessage (iceConn=0x2204500, 
    clientData=<value optimized out>, opcode=<value optimized out>, length=1, 
    swap=<value optimized out>, replyWait=<value optimized out>, 
    replyReadyRet=0x7fff4502a6a8) at ../../src/sm_process.c:252
	errVal = 255 'ÿ'
	errOffset = <value optimized out>
#5  0x00007f720bd0c00c in IceProcessMessages (iceConn=0x2204500, 
    replyWait=0x0, replyReadyRet=0x0) at ../../src/process.c:343
	header = (iceMsg *) 0x2201f80
	replyReady = 0
	useThisReplyWait = (IceReplyWaitInfo *) 0x0
	retStatus = <value optimized out>
#6  0x00007f720e0c810f in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#7  0x00007f720dbefddc in QMetaObject::activate ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#8  0x00007f720dc25e9e in QSocketNotifier::activated ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#9  0x00007f720dbf4773 in QSocketNotifier::event ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#10 0x00007f720e06defc in QApplicationPrivate::notify_helper ()
   from /usr/lib/libQtGui.so.4
No symbol table info available.
#11 0x00007f720e0751ce in QApplication::notify () from /usr/lib/libQtGui.so.4
No symbol table info available.
#12 0x00007f720dbdac2c in QCoreApplication::notifyInternal ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#13 0x00007f720dc0342a in ?? () from /usr/lib/libQtCore.so.4
No symbol table info available.
#14 0x00007f720b857bbe in g_main_context_dispatch ()
   from /lib/libglib-2.0.so.0
No symbol table info available.
#15 0x00007f720b85b588 in ?? () from /lib/libglib-2.0.so.0
No symbol table info available.
#16 0x00007f720b85b6b0 in g_main_context_iteration ()
   from /lib/libglib-2.0.so.0
No symbol table info available.
#17 0x00007f720dc031a6 in QEventDispatcherGlib::processEvents ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#18 0x00007f720e1024be in ?? () from /usr/lib/libQtGui.so.4
No symbol table info available.
#19 0x00007f720dbd9532 in QEventLoop::processEvents ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#20 0x00007f720dbd9904 in QEventLoop::exec () from /usr/lib/libQtCore.so.4
No symbol table info available.
#21 0x00007f720dbdbab9 in QCoreApplication::exec ()
   from /usr/lib/libQtCore.so.4
No symbol table info available.
#22 0x0000000000406250 in main ()
No locals.