Bug reproduced with strace-ing.
The problem seems to be that it sends a SIGINT to the init process (pid 0):
See the end of the attached strace log:
8587 kill(0, SIGINT)
You can try it yourself by simply running qtoctave and pressing the 'X' button
_several_ times.
I'm not a QT whiz, but maybe you should read this:
http://doc.trolltech.com/3.3/qprocess.html#kill
(Instead of calling the 'kill' system call directly)
and this:
http://doc.trolltech.com/3.3/qprocess.html#isRunning
My guess is that QTOctave is trying to kill the connection process after
it has been killed.
** Attachment added: "qtoctave_strace.log.gz"
http://launchpadlibrarian.net/16739492/qtoctave_strace.log.gz
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QtOctave "Stop process" button killed Xorg
https://bugs.launchpad.net/bugs/251133
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