Date: Thu, 29 Jun 2006 10:40:13 +1200 From: Andrew Thompson <thompsa@freebsd.org> To: User Freebsd <freebsd@hub.org> Cc: freebsd-stable@freebsd.org, Robert Watson <rwatson@FreeBSD.org> Subject: Re: How to enter DDB through a terminal server / remote console ... ? Message-ID: <20060628224013.GA64197@heff.fud.org.nz> In-Reply-To: <20060628193421.B43909@ganymede.hub.org> References: <20060628175839.F43909@ganymede.hub.org> <20060628232727.N78211@fledge.watson.org> <20060628193421.B43909@ganymede.hub.org>
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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. Andrew
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