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Re: Crash followed by green db> prompt
> You probably activated ddb(4) by pressing <Ctrl>-<Alt>-<Esc> - see the ddb(4)
> manpage for details.
Very unlikely: I was editing a file in the vi editor. After running vi in
recovery mode, I saw a bunch of garbage with null characters in the middle of
the file. When I went to delete that, I got another crash, apparently, as the
screen went blank and couldn't be revived by an ordinary keypress. I was
fooled into power-off rebooting, but later found that it might have been
screenblank running when it was not supposed to.
After a subsequent such false crash, I found I could revive the screen by
Ctrl-Alt-F2, going to another virtual terminal, waiting for the login prompt
that I couldn't see, and typing
After waiting a few seconds for a password prompt that I couldn't see, I typed
the root password(Enter), and then, in response to the command prompt that I
couldn't see, typed
Back to life! Not wanting to depend on this, I turned off screenblank in
Thanks to Martin Husemann for suggestions regarding ddb and sysctl, but very
doubtful if I will be able to reproduce that particular crash, and very
doubtful that I would know how to do anything useful in the debugger.
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