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Date: Thu, 15 Nov 2007 13:07:44 +0100
From: Ed Schouten <ed@fxq.nl>
To: Benno Rice <benno@jeamland.net>
Message-ID: <20071115120744.GT17028@hoeg.nl>
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Cc: current@freebsd.org
Subject: Re: Repeatable crash with fdisk
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* Benno Rice <benno@jeamland.net> wrote:
> Fatal trap 12: page fault while in kernel mode
> cpuid =3D 1; apic id =3D 01
> fault virtual address	=3D 0x20
> fault code		=3D supervisor read data, page not present
> instruction pointer	=3D 0x8:0xffffffff80256ac4
> stack pointer	        =3D 0x10:0xffffffff9ed19b80
> frame pointer	        =3D 0x10:0xffffffff9ed19bd0
> code segment		=3D base 0x0, limit 0xfffff, type 0x1b
> 			=3D DPL 0, pres 1, long 1, def32 0, gran 1
> processor eflags	=3D interrupt enabled, resume, IOPL =3D 0
> current process		=3D 2 (g_event)
> [thread pid 2 tid 100014 ]
> Stopped at      g_mbr_config+0x64:      movq    0x20(%rax),%r15
> db> bt
> Tracing pid 2 tid 100014 td 0xffffff00010946a0
> g_mbr_config() at g_mbr_config+0x64
> g_run_events() at g_run_events+0x1b8
> g_event_procbody() at g_event_procbody+0x57
> fork_exit() at fork_exit+0x11f
> fork_trampoline() at fork_trampoline+0xe
> --- trap 0, rip =3D 0, rsp =3D 0xffffffff9ed19d30, rbp =3D 0 ---
> db>

Are you running FreeBSD/i386? If so, I guess gsp is NULL in
g_mbr_config(). Not sure. Can you run the following command:

	addr2line -e <where kernel.debug is> <instruction pointer>

That will return the C statement where it went wrong. Thanks.

Yours,
--=20
 Ed Schouten <ed@fxq.nl>
 WWW: http://g-rave.nl/

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