From owner-freebsd-hackers@FreeBSD.ORG  Mon Jun 20 16:11:47 2011
Return-Path: <owner-freebsd-hackers@FreeBSD.ORG>
Delivered-To: freebsd-hackers@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id F0558106564A;
	Mon, 20 Jun 2011 16:11:47 +0000 (UTC) (envelope-from imp@bsdimp.com)
Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85])
	by mx1.freebsd.org (Postfix) with ESMTP id AD6DD8FC13;
	Mon, 20 Jun 2011 16:11:47 +0000 (UTC)
Received: from [10.30.101.53] ([209.117.142.2]) (authenticated bits=0)
	by harmony.bsdimp.com (8.14.4/8.14.3) with ESMTP id p5KG7lNo063175
	(version=TLSv1/SSLv3 cipher=DHE-DSS-AES128-SHA bits=128 verify=NO);
	Mon, 20 Jun 2011 10:07:48 -0600 (MDT) (envelope-from imp@bsdimp.com)
Mime-Version: 1.0 (Apple Message framework v1084)
Content-Type: text/plain; charset=us-ascii
From: Warner Losh <imp@bsdimp.com>
In-Reply-To: <201106200849.10862.jhb@freebsd.org>
Date: Mon, 20 Jun 2011 10:07:39 -0600
Content-Transfer-Encoding: quoted-printable
Message-Id: <7B9E5AE3-C895-4D07-B923-A2F178B7B9BF@bsdimp.com>
References: <BANLkTinGGTpwGdUFSW7jNHmpR8fyYoGd6Q@mail.gmail.com>
	<BANLkTimrYbXSaZtRtZ5+Pst_S=X9nu8uHA@mail.gmail.com>
	<BANLkTinhOxLXzg=zH9TMHX13ppSfcX+y4Q@mail.gmail.com>
	<201106200849.10862.jhb@freebsd.org>
To: John Baldwin <jhb@freebsd.org>
X-Mailer: Apple Mail (2.1084)
X-Greylist: Sender succeeded SMTP AUTH, not delayed by milter-greylist-4.0.1
	(harmony.bsdimp.com [10.0.0.6]);
	Mon, 20 Jun 2011 10:07:48 -0600 (MDT)
Cc: freebsd-hackers@freebsd.org, Ansar Mohammed <ansarm@gmail.com>
Subject: Re: Shooting trouble on a PCI bus hang
X-BeenThere: freebsd-hackers@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: Technical Discussions relating to FreeBSD
	<freebsd-hackers.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>, 
	<mailto:freebsd-hackers-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-hackers>
List-Post: <mailto:freebsd-hackers@freebsd.org>
List-Help: <mailto:freebsd-hackers-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-hackers>,
	<mailto:freebsd-hackers-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 20 Jun 2011 16:11:48 -0000


On Jun 20, 2011, at 6:49 AM, John Baldwin wrote:

> On Sunday, June 19, 2011 12:35:49 pm Ansar Mohammed wrote:
>> I appreciate that. The system works fine with NetBSD, LInux and =
Windows XP,
>> so I doubt its hardware.
>>=20
>> Interesting though that OpenBSD has the same issue.
>>=20
>> A question about the debug kernel load process: as it hangs on *
>> pci_print_verbose* in pci.c, can I deduce that this is the exact code
>> segment that is the issue?
>=20
> Well, if that was the last device on the bus it might be in a device =
driver
> probe routine.  You can try adding more printfs to device_probe(), =
etc. to=20
> output each driver name as it probes each device perhaps.

We've also had problems with interrupt storms after the drivers have all =
probed, and people blame the last printf :)

It sounds, however, with the OpenBSD datapoint that something is being =
initialized bogusly, perhaps tripping over an erratum that the other =
systems avoid or have specific code to work around.

Warner=