GtkStatusBar gets stuck at a /random/ position and wants me to mousehover button

I will keep it simple

I have the function inside_thread that runs a while loop and calls the function update_progressbar that simply updates a GtkStatusBar.

I am calling inside_thread in a thread using g_thread_new("processing", GThreadFunc, NULL); from a callback function on_starter_clicked.

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It tends to do the job, it works fast and it updates the status bar according to the progress of the while loop.

The problem is that sometimes (at unspecified place) the progress bar gets stuck and it gets unstuck if I mouseenter or mouseleave a button in the application. Very strange behavior I must admit

What could be wrong?