is this some sort of linux? if so, try ctrl+alt+f1 through f12 (to switch virtual terminal) one of them may drop you to text mode CLI login where you can use programs like ps, top, kill and killall to pick and force quit programs. you can then return with chvt or ctrl+alt+f1 through f12 to your session. it can sometimes be confusing because often one VT is the GUI login. if you get that, it doesn't necessarily mean you're logged out. your session is just on another VT.
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