How to enter DDB through a terminal server / remote console ...
thompsa at freebsd.org
Wed Jun 28 22:40:18 UTC 2006
On Wed, Jun 28, 2006 at 07:34:43PM -0300, User Freebsd wrote:
> On Wed, 28 Jun 2006, Robert Watson wrote:
> >On Wed, 28 Jun 2006, User Freebsd wrote:
> >>'k, now that I'm up to 3 6-STABLE servers that are deadlocking, I'm
> >>spending time with the remote tech today to get a serial console put
> >>online ... how do I drop into DDB remotely, where the serial console is
> >>going through a Portmaster Terminal server? issuing CTL-ALT-ESC, I
> >>doubt, will work, will it?
> >If configured to use a serial console (console="comconsole" in
> >loader.conf), you can enter the debugger with BREAK_TO_DEBUGGER in the
> >kernel config by sending a serial break. With my portmasters, I telnet to
> >a TCP port to connect to the serial console, so I send a telnet break,
> >using ^]send break.
> Have you ever had a problem with this warning: "(useful for remote
> diagnostics, but also dangerous if you generate a spurious BREAK on the
> serial port!)" in the handbook?
You can use ALT_BREAK_TO_DEBUGGER which uses the CR ~ ^b sequence if you
are worried about stray breaks.
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