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Date:      Tue, 06 Mar 2001 23:50:34 +0000
From:      David Malone <dwmalone@maths.tcd.ie>
To:        John Baldwin <jhb@FreeBSD.org>
Cc:        David Malone <dwmalone@maths.tcd.ie>, cvs-all@FreeBSD.org, cvs-committers@FreeBSD.org, Dag-Erling Smorgrav <des@ofug.org>, dwmalone@maths.tcd.ie
Subject:   Re: cvs commit: src/sys/i386/isa apic_vector.s icu_vector.s 
Message-ID:   <200103062350.aa85798@salmon.maths.tcd.ie>
In-Reply-To: Your message of "Tue, 06 Mar 2001 13:17:28 PST." <XFMail.010306131728.jhb@FreeBSD.org> 

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> Yeah, cause the stack is hosed it looks like.  Hrmmmm.  Add the following
> options to your kernel:

> options         KTR
> options         KTR_EXTEND
> options         KTR_COMPILE=0x1208

> Then before you do a buildworld, run the followign command as root:

> # sysctl -w debug.ktr.mask=0x1200

> Then run the buildworld and crash teh machine. :-P  The type 'show ktr' to get
> a list of the various interrupts and process changes that occured up until
> things blew up.  If you have a serial console and can knab that output that

Ok - I managed to get a panic. I don't have a serial console, but
I think it may have provided a hint anyway. "show ktr" turned up alot
of entries of the form:

755: ithread_schedule: pid 12: it_need 1, state 2
754: ithread_schedule: pid 12: (swi6: tty:sio+) need 1
753: swi_sched pid 12(swi6: tty:sio+) need=1

I presume this is because there is a Rugby Radio clock reciever
wired to the DCD pin of one of the serial ports. I'm monitoring
the asserts and clears on this pin. These are timed in userland
using the functions provided in sys/timepps.h - it should only
cause 3 or 4 interrupts per second at most. Think this could
be part of triggering the problem?

(Otherwise, I can try to figure out what the ktr output it telling
me. Any hints on what I'm looking for?)

	David.

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