Yet another crash in FreeBSD 5.1

[Greg 'groggy' Lehey]

On Saturday,  2 August 2003 at 16:47:13 +0200, Eivind Olsen wrote:
> --On 2. august 2003 02:11 -0700 Terry Lambert <tlambert2 at mindspring.com>
> wrote:
>>> 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.
>
> I did. At least I've tried to. :)
> (I have a kernel.debug which was compiled at the same time as the real
> kernel I'm using, and it's approx. 30MB in size).
>
>> You don't actually need a crash dump to debug a stack traceback.
>
> This is what I found by using those commands you mentioned:
>
> eivind at vimes:~/tmp/debug > gdb -k kernel.debug
> GNU gdb 5.2.1 (FreeBSD)
> Copyright 2002 Free Software Foundation, Inc.
> GDB is free software, covered by the GNU General Public License, and you are
> welcome to change it and/or distribute copies of it under certain
> conditions.
> Type "show copying" to see the conditions.
> There is absolutely no warranty for GDB.  Type "show warranty" for details.
> This GDB was configured as "i386-undermydesk-freebsd"...
> (kgdb) list *(g_dev_strategy+29)

This is almost certainly the wrong function.  At the very list you
should look at the arguments passed to it.

> (kgdb) list *(launch_requests+448)
> No symbol "launch_requests" in current context.
> (kgdb) list *(vinumstart+2b2)
> No symbol "vinumstart" in current context.
> (kgdb)

Read the links I just sent you.  You haven't loaded the Vinum symbols.

> If anyone wants to take a look at this themselves I've put the compressed
> (gzip) debug-kernel available on
> http://eivind.aminor.no/debug/kernel.debug.gz
> NOTE! It's approx. 13MB compressed!

The kernel's not much use by itself.  

Greg
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