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From: Sean Bruno <seanbru@yahoo-inc.com>
To: John Baldwin <jhb@freebsd.org>
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Date: Tue, 02 Oct 2012 16:12:59 -0700
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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 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