Version:           4 (using Devel) 
OS:                Linux

I have seen that kmix sometimes starts eating too much cpu and hangs, so i run it with gdb:

(gdb) run
Starting program: /usr/bin/kmix 
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib64/libthread_db.so.1".
Detaching after fork from child process 27491.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QDBusConnection: session D-Bus connection created before QCoreApplication. Application may misbehave.
QObject::connect: Incompatible sender/receiver arguments
        KMenu::aboutToShow() --> KMixDockWidget::activateMenuOrWindow(bool,QPoint)
[Inferior 1 (process 27488) exited normally]
(gdb) QObject::connect: Incompatible sender/receiver arguments
        KMenu::aboutToShow() --> KMixDockWidget::activateMenuOrWindow(bool,QPoint)
UPnP device entered: "uuid:75802409-bccb-40e7-0c43-00222db33f63" 
UPnP device entered: "uuid:39e9a0ae-a53a-4f16-a9df-bef700dd0f7a" 
UPnP device entered: "uuid:f97b1c36-367e-4247-9586-4411664b19cd" 
UPnP device entered: "uuid:452e4560-906d-4ba3-b88d-439031b76509" 
UPnP device entered: "uuid:8207604b-6ba3-4d3b-82ba-d937b940cbb4" 
QObject::connect: Incompatible sender/receiver arguments
        KMenu::aboutToShow() --> KMixDockWidget::activateMenuOrWindow(bool,QPoint)
kmix(27491) sink_cb: Sink callback failure 
kmix(27491) sink_input_cb: Sink Input callback failure 
kmix(27491) sink_cb: Sink callback failure

Reproducible: Didn't try

Steps to Reproduce:
Start playing a yourtuve video for example and hot kmix to change sound and it will start eating too cpu and will hang.

Actual Results:  
kmix eats too cpu and hangs

Expected Results:  
Shouldnt eat cpu and shouldnt hang.

OS: Linux (x86_64) release 3.1.6-1.1-desktop
Compiler: gcc