From owner-freebsd-stable@FreeBSD.ORG  Wed Oct  3 20:43:16 2012
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From: John Baldwin <jhb@freebsd.org>
To: Sean Bruno <seanbru@yahoo-inc.com>
Date: Wed, 3 Oct 2012 16:40:09 -0400
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Cc: "freebsd-stable@freebsd.org" <freebsd-stable@freebsd.org>,
	Andriy Gapon <avg@freebsd.org>
Subject: Re: stable/9 panic Bad tailq NEXT(0xffffffff80e52660->tqh_last) !=
	NULL
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On Tuesday, October 02, 2012 7:12:59 pm Sean Bruno wrote:
> On Tue, 2012-10-02 at 14:06 -0700, John Baldwin wrote:
> > On Tuesday, October 02, 2012 3:05:30 pm Sean Bruno wrote:
> > > On Mon, 2012-10-01 at 05:47 -0700, John Baldwin wrote:
> > > > Can you add extra printfs to see where exactly attach is failing?  I
> > > > would
> > > > start with the attach routine in sys/dev/acpica/acpi_pcib_pci.c:
> > > > 
> > > > 
> > > 
> > > hrm ... interesting side effects.  After adding my printf's I don't hit
> > > the panic any more.  :-)
> > > 
> > > I changed the ret val of acpi_pcib_pci_attach() and put in some
> > > instrumentation in acpi_pcib_attach().  The key value is that
> > > acpi_DeviceIsPresent() appears to be returning FALSE in this case.
> > > 
> > > patch used -->http://people.freebsd.org/~sbruno/acpi_pcib.txt
> > 
> > What happens if you just comment out the acpi_DeviceIsPresent() check?
> > 
> 
> 
> wow, it booted up and seems to be fine.  huh ...
> pcib7: <ACPI PCI-PCI bridge> at device 28.0 on pci0
> pcib7:   domain            0
> pcib7:   secondary bus     7
> pcib7:   subordinate bus   7
> pcib7:   no prefetched decode
> pci7: <ACPI PCI bus> on pcib7
> pci7: domain=0, physical bus=7

Is there anything on the bus?

-- 
John Baldwin