Threads displayed on interrupt inconsistent when using lldb/gcc

Steps to reproduce:

• set up kit using Qt4, gcc and lldb engine
• create simple Qt Gui App (template from wizard)
• switch to Debug view and enable display of Threads
• start debugging, when inferior comes up interrupt
• open the combo box for switching the threads and compare the listed thread numbers to the listed threads inside Thread view

Expected result:

• same threads are displayed

Current result:

• some (unavailable) threads are displayed (either inside the combo box or inside the threads view, not fully consistent)
• if you choose to switch to one of the available of the combobox and open the combo box again, the unavailable threads are no more shown
• if you choose to switch to one of the unavailable of the threads view and open the combo box afterwards they're listed there as well