I tried to install anaconda and run liveinst from a custom live image. liveinst failed, I clicked debug, and perhaps another innocent-looking confirmation ... and then the machine rebooted. What made it extra "funny" was that it crashed because of problems installing the boot loader. I would expect that liveinst from a live media _never_ rebooted the system ... at least not without explicit permission. (Anaconda running from an installer media might be a different story.) anaconda-16.18-1.fc16
That was after "An unhandled exception has occured" that led to bug 735730#c30 . (Btw: quite confusing that "report" is hidden behind "save".) I'm quite sure it rebooted when I clicked "Exit" - but I can't reproduce it.
*** Bug 740824 has been marked as a duplicate of this bug. ***
This should be fixed by commit e88a00f1d1fbfffe1af87a568df2d0cd2349352e
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