Re: Problems

[Donald Allen <donaldcallen%gmail.com@localhost>]

On Mon, Nov 22, 2010 at 1:45 PM, Donald Allen 
<donaldcallen%gmail.com@localhost> wrote:
> On Mon, Nov 22, 2010 at 1:32 PM, Eric Haszlakiewicz 
> <erh%nimenees.com@localhost> wrote:
>> On Mon, Nov 22, 2010 at 12:57:21PM -0500, Donald Allen wrote:
>>> I rebooted the system without the card inserted and note that there is
>>> now a /var/crash/netbsd.0.core.gz, apparently a core dump. Would this
>>> be helpful to you? It would take some doing to get it off this system
>>> (I have no working network cards and no CD writer, so I'd have to
>>> split the file into small enough chunks, 10 or so, to fit on a floppy
>>> disk), but I'll do it if it would be helpful. Can I send emails with
>>> attachments to this list?
>>
>> Do you have a serial console?  It might be less hassle to setup ppp or sl
>> and transfer the file that way.
>
> Setup both ends of ppp, something I haven't done in years, and try to
> find two modem cables and a null modem somewhere? Easier? I don't
> think so. I'll just write the 10 chunks to floppies.
>
>>
>> Don't attach a core dump.  That's more than a bit too big.
>
> Good point -- it's over 9M.
>
>>
>> Once you get the core dump to a machine where you have gdb you can
>> try to get a stack backtrace.  That might point out enough of the
>> problem that you won't need to send the core dump to anyone else.
>
> Ok, I'll give it a try.

First of all, I realized that trying to move the dump to another
machine wasn't necessary; the machine on which the crash occurred has
a copy of gdb, so I was able to look at the dump there. I just tee'ed
the gdb session and copied *that*, much more manageable in size, to
the real machine I'm typing on now with a floppy.

Here's the session, but the backtrace does not look useful to me (it
looks to my uneducated eyes like the frames for the stuff that handles
a panic, or maybe a trap within a trap?). If I'm right about this,
someone please advise me about how to get something more useful.

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This GDB was configured as "i386--netbsdelf"...
(gdb) target kvm netbsd.1.core
#0  0xc058e112 in cpu_reboot (howto=260, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:924
924            dumpsys();
(gdb) bt
#0  0xc058e112 in cpu_reboot (howto=260, bootstr=0x0)
    at ../../../../arch/i386/i386/machdep.c:924
#1  0xc04cfbb0 in panic (fmt=0xc0a7694e "trap")
    at ../../../../kern/subr_prf.c:253
#2  0xc0590e57 in trap (frame=0xcb29a6cc)
    at ../../../../arch/i386/i386/trap.c:368
#3  0xc010cbe0 in calltrap ()
#4  0xc05913cc in trap (frame=0xcb29a7a0)
    at ../../../../arch/i386/i386/trap.c:410
#5  0xc010cbe0 in calltrap ()
#6  0x00000000 in ?? ()
(gdb) quit