From owner-freebsd-hackers Wed May 31 2:37:33 2000 Delivered-To: freebsd-hackers@freebsd.org Received: from sasi.com (sasi.com [164.164.56.2]) by hub.freebsd.org (Postfix) with ESMTP id 72C3637B861; Wed, 31 May 2000 02:37:17 -0700 (PDT) (envelope-from gbnaidu@sasi.com) Received: from samar (sasi.com [164.164.56.2]) by sasi.com (8.9.3/8.9.3) with SMTP id PAA11697; Wed, 31 May 2000 15:05:09 +0530 (IST) Received: from pcd75.sasi.com ([10.0.16.75]) by sasi.com; Wed, 31 May 2000 15:05:08 +0000 (IST) Received: from localhost (gbnaidu@localhost) by pcd75.sasi.com (8.9.3/8.9.3) with ESMTP id PAA00856; Wed, 31 May 2000 15:04:57 +0530 Date: Wed, 31 May 2000 15:04:57 +0530 (IST) From: "G.B.Naidu" To: Soren Schmidt Cc: freebsd-net@FreeBSD.ORG, freebsd-hackers@FreeBSD.ORG Subject: Re: system hangs... (fwd) In-Reply-To: <200005310759.JAA91324@freebsd.dk> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=X-UNKNOWN Content-Transfer-Encoding: QUOTED-PRINTABLE Sender: owner-freebsd-hackers@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG Hi Soren, Thanks a lot for the help. CTRL+ALT+ESC works. Thanks once again. Now we can do some analysis. regards --gb On Wed, 31 May 2000, Soren Schmidt wrote: > It seems G.B.Naidu wrote: > >=20 > > I have posted this earlier. I didnt get any reply about system hangs. > > Please some body help me out to track down these hangs. Questions are > > below. >=20 > Have you tried putting DDB into the kernel, and tried to > hit ALT+CTRL+ESC to go into the debugger on the hang ? >=20 > Printf is a good tool here, sprinkle your source with > printf's so you can see how far you get, and what=20 > essential values are getting used. >=20 > Another possibility is to attach 8 LED's to a printer > port, those you can then turn on/off at will by a simple > outb statement. I use a 2*40 char LCD display connected > this way sometimes, that gives me a history of 80 values, > so I can se the exact sequence of events that let me to=20 > the problem at hand.. >=20 > -S=F8ren >=20 --=20 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message