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Date: Fri, 4 Jul 2003 18:04:31 -0700
From: Kris Kennaway <kris@obsecurity.org>
To: John Baldwin <jhb@FreeBSD.org>
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Subject: Re: Panic at boot time on SMP
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On Thu, Jul 03, 2003 at 10:34:34AM -0400, John Baldwin wrote:

> > Fatal trap 12: page fault while in kernel mode
> > cpuid =3D 0; lapic.id =3D 01000000
> > fault virtual address   =3D 0xdf119fec
> > fault code              =3D supervisor write, page not present
> > instruction pointer     =3D 0x8:0xc030b254
> > stack pointer           =3D 0x10:0xc0467b48
> > frame pointer           =3D 0x10:0xc0467b48
> > code segment            =3D base 0x0, limit 0xfffff, type 0x1b
> >                         =3D DPL 0, pres 1, def32 1, gran 1
> > processor eflags        =3D interrupt enabled, resume, IOPL =3D 0
> > current process         =3D 0 (swapper)
> > kernel: type 12 trap, code=3D0
> > Stopped at      cpu_thread_setup+0x24:  movl    $0,0x24c(%ecx)
> > db> trace
> > cpu_thread_setup(c21ab000,0,c033b1d4,be,0) at cpu_thread_setup+0x24
>=20
> void
> cpu_thread_setup(struct thread *td)
> {
>=20
>         td->td_pcb =3D
>              (struct pcb *)(td->td_kstack + KSTACK_PAGES * PAGE_SIZE) - 1;
>         td->td_frame =3D (struct trapframe *)((caddr_t)td->td_pcb - 16) -=
 1;
>         td->td_pcb->pcb_ext =3D NULL;=20
> }
>=20
> On my laptop, cpu_thread_setup+0x24 is the line that sets td->td_pcb->pcb=
_ext
> to NULL.  It would seem that td_pcb is hosered.  You could perhaps add
> some printf's to dump the value of td_kstack and make sure it is a sane
> value?

td->td_kstack =3D 0xdf112000

Kris

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