Re: 2.6.14-rc4-rt1 - enable IRQ-off tracing causes kernel to fault at boot

From: Mark Knecht
Date: Thu Oct 13 2005 - 07:29:54 EST

On 10/13/05, Ingo Molnar <mingo@xxxxxxx> wrote:
> * Mark Knecht <markknecht@xxxxxxxxx> wrote:
> > Config file attached. The only change was to enable IRQ-off latency
> > tracing using make menuconfig. Rebuild and reboot. I got a message
> > about the kernel not syncing, lots of stuff above that message about
> > do_futex, etc.
> i cannot reproduce your problems - your .config works fine on my x64
> box. A log of the crash would be needed - do you have a null-modem cable
> to connect this box to some other nearby box to do serial logging? If
> yes then there is a mini-howto below. (for x86, but it works the same
> for x64)
> Ingo
Guitar player doesn't do serial ports? ;-)

OK, I've never done anything like this before, but I'm motivated so
I'll give it a shot. Hopefully I can make some headway without having
to ask too many stupid questions, such as the one that follows:

Question: Is a 'null modem' cable just a plain serial cable, or is it
a special serial cable I need to go buy?

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