Qt GUI app hangs sometimes

[rampage644]

Good day.

Sorry for my english, it's not quite good.

i have multi-threaded application with network and db access (it's a client, not a server). Sometimes application hangs on startup/network connection establishing (doesn't matter).

I suppose there are some pitfalls with widget painting.. May be there is a code that tries to update (or paint) some widget outside main thread.

I know it's entirely my fault, not Qt. But i can't understand whats happening here and how to detect this bug.

PS Qt 4.7.1, Archlinux, Ubuntu, gcc 4.5.2, gcc 4.6.0

Backtrace is in attachments.