FreeBSD 8.0 how to enter kernel debugger inside vmware

Andrew Brampton brampton+freebsd at
Wed Jan 27 16:39:56 UTC 2010

You might want to recompile your kernel with the ALT_BREAK_TO_DEBUGGER
option. This allows you to use <CR>~^b to enter the debugger instead
of ctrl-alt-esc.


2010/1/27 Daniel Mueller <dan at>:
> Hi all
> I have an unstable machine running FreeBSD 8.0-RELEASE inside vmware. It
> freezes on average once a week but doesn't panic, so i would like to
> enter the kernel debugger, to at least being able to force a panic.
> Unfortunately, i have no serial interface and can't enter into the
> debugger on the console using ctrl-alt-esc either, because it conflicts
> with the key sequence to leave the console in the vmware client. What
> can i do?
> many thanks and best regards
> -Daniel
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