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When a start playing an movie and use f for fullscreen but holds down f for sometime (1-3sec) vlc freezes.but the sound continues to play.
It starts to use all cpu and i can't close it normally.
If i start it with -vvv i see that it's in an loop printing
[0x160cab8] qt4 video output debug: Qt: Entering Fullscreen
[0x160cab8] qt4 video output debug: Qt4: Fullscreen state changed
[0x160cab8] qt4 video output debug: Qt: Quitting Fullscreen
[0x160cab8] qt4 video output debug: Qt4: Fullscreen state changed

indeed, there must be a race condition bug here.
I created a ticket, thanks for the report.
http://trac.videolan.org/vlc/ticket/6273

Good then i don't need to open a ticket and run an backtrace myself.