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Date: Sat, 15 Oct 2005 18:52:15 -0600 (MDT)
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To: thompsa@freebsd.org
From: "M. Warner Losh" <imp@bsdimp.com>
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	Sat, 15 Oct 2005 18:51:02 -0600 (MDT)
Cc: current@freebsd.org
Subject: Re: RC1 panic on boot
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In message: <20051015073245.GA27380@heff.fud.org.nz>
            Andrew Thompson <thompsa@freebsd.org> writes:
: On Sat, Oct 15, 2005 at 02:43:13PM +1300, Andrew Thompson wrote:
: > I am getting this panic on RC1, I am booting disc1 to install the
: > system. Its a HP Omnibook 4150 and no PC cards are inserted. 
: > 
: > Fatal trap 12: page fault while in kernel mode
: > fault virtual address   = 0x0
: > fault code              = supervisor read, page not present
: > instruction pointer     = 0x20:0xc0e96b0a
: > stack pointer           = 0x28:0xc1020b7c
: > frame pointer           = 0x28:0xc1020b8c
: > code segment            = base 0x0, limit 0xfffff, type 0x1b
: >                         = DPL 0, pres 1, def32 1, gran 1
: > processor eflags        = interrupt enabled, resume, IOPL = 0
: > current process         = 0 (swapper)
: > trap number             = 12
: > panic: page fault
: 
: The laptop boots fine without acpi. Here is the line number for the panic. 
: 
: (gdb) l *acpi_pci_link_lookup+0x42
: 0x3ffc2 is in acpi_pci_link_lookup (/usr/src/sys/modules/acpi/acpi/../../../dev/
: acpica/acpi_pci_link.c:590).
: 585             struct acpi_pci_link_softc *sc;
: 586             int i;
: 587
: 588             ACPI_SERIAL_ASSERT(pci_link);
: 589             sc = device_get_softc(dev);
: 590             for (i = 0; i < sc->pl_num_links; i++)
: 591                     if (sc->pl_links[i].l_res_index == source_index)
: 592                             return (&sc->pl_links[i]);
: 593             return (NULL);
: 594     }

Weird.  sc has to be null here for this to fail at that line...

Warner