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Date: Sat, 02 Aug 2003 02:11:24 -0700
From: Terry Lambert <tlambert2@mindspring.com>
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Subject: Re: Yet another crash in FreeBSD 5.1
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Eivind Olsen wrote:
> Can anyone suggest what I do next to find out about this crash?

> Fatal trap 12: page fault while in kernel mode
> fault virtual address   = 0x14

Dereference of NULL pointer; reference is for element at offset
0x14 in some structure; this is the equivalent of 5 32 bit ints
or pointers into the structure.

> db> trace
> g_dev_strategy(c2156024,c2153800,0,cfb528d0,c2099eca) at g_dev_strategy+0x29
> launch_requests(c299bf00,0,10000,ffffffff,47) at launch_requests+0x448
> vinumstart(c5ada2d0,0,c22ab000,cfb5294c,c02e5bc6) at vinumstart+0x2b2

gdb -k kernel.debug
(gdb) list *(g_dev_strategy+29)
[ ... ]
(gdb) list *(launch_requests+448)
[ ... ]
(gdb) list *(vinumstart+2b2)
[ ... ]

Will give you the exact source lines involved, assuming you
built a debug kernel.

You don't actually need a crash dump to debug a stack traceback.

-- Terry