Re: gdb cannot read kernel crash dump

[Julio Merino <jmmv%julipedia.org@localhost>]

On 8/18/11 3:33 AM, J. Hannken-Illjes wrote:
> On Aug 17, 2011, at 11:06 PM, Julio Merino wrote:
>
> > Hello,
> >
> > My virtual machine running amd64 -current just crashed and rebooted
> > while building a set of packages.  I found a crash dump in /var/crash
> > and attempted to load it with gdb (after gunzipping it, of course), but
> > gdb complains:
> >
> > netbsd# gdb -q netbsd.1 netbsd.1.core
> > (no debugging symbols found)
> > "/var/crash/netbsd.1.core" is not a core dump: File format not recognized
> > (gdb)
> >
> > Might this have been caused by gcc 4.5 changes?
> >
> > Thanks.
>
> What if you use
>         gdb netbsd.1
>         target kvm netbsd.1.core
> instead?

Heh, "of course".  I had forgotten that and only tried the obvious.  Thanks.

That said, this does not look right:

$ sudo gdb netbsd.1
GNU gdb 6.5
[...]
(gdb) target kvm netbsd.1.core
#0  0x00000000 in sigcode ()
(gdb) bt
#0  0x00000000 in sigcode ()

The other crash dumps I've got don't show any useful information either.