----- Original Message ----- From: "Benjamin Kaduk" <ka...@mit.edu>
To: "José Pérez Arauzo" <f...@aoek.com>
Cc: "FreeBSD Current" <freebsd-current@freebsd.org>
Sent: Sunday, September 28, 2014 8:54 PM
Subject: Re: What do you use for kernel debugging?

On Sun, 28 Sep 2014, José Pérez Arauzo wrote:

I am trying to track down a (deadlock?) issue in CURRENT via DDB. The kernel 
not complete hw probes on my Acer V5.

I get stuck on apic_isr looping which leads nowhere.

So I thought maybe things improve if I debug from another machine.

What do you use for kernel debugging? According to the handbook kgdb over serial
is a good option, do you agree? I'm on a netbook with no ethernet and no option
for firewire: can I have a USB / nullmodem setup to work?

You cannot.

I have no old-style uarts hardware anymore, as the handbook suggests...

Any idea is welcome before I buy extra hw. I have a USB to serial showing up as
/dev/cuaU0, do I need to grab another one and a nullmodem cable or there are 
alternatives? Thank you.

I'm not sure that there are alternatives at all, unfortunately.

You may be reduced to debugging-via-printf.

dtrace can also be quite invaluable.

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