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Date: Thu, 2 Jun 2005 14:06:54 -0400
From: Kris Kennaway <kris@obsecurity.org>
To: Derek Kuli?ski <takeda@takeda.tk>
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Cc: freebsd-stable@freebsd.org, Kris Kennaway <kris@obsecurity.org>
Subject: Re: stack backtrace
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On Thu, Jun 02, 2005 at 09:11:23AM -0700, Derek Kuli?ski wrote:
> Hello Kris,
>=20
> Thursday, June 2, 2005, 12:37:41 AM, you wrote:
>=20
> > It looks like debugging code (it's been removed in -current).
>=20
> > Jeff:
>=20
> > in 1.141 of ffs_softdep.c you added a call to backtrace() if bp->b_vp
> > =3D=3D NULL..you removed it in current in 1.166, but some people are
> > seeing it trigger on 5.x
>=20
> So it's harmless?

I don't know, but I presume the debugging code was added for debugging
reasons :-)

> As for debugging, I compiled kernel with:
> makeoptions     DEBUG=3D-g
> options         KDB
> options         KDB_TRACE
> options         DDB
>=20
> To have coredump, if system crashes (I didn't oticed any slowdown, so
> I guess it doesn't hurt)
>=20
> Are those last three options necessary to get core? Or is only
> DEBUG=3D-g needed?

Please consult the developers' handbook chapter on kernel debugging
for full instructions.

Kris
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