From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 16 12:21:11 2005
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Date: Wed, 16 Nov 2005 04:21:09 -0800 (PST)
From: Rob <spamrefuse@yahoo.com>
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Subject: Re: Swapfile problem in 6?
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--- Peter Jeremy <PeterJeremy@optushome.com.au> wrote:

> On Tue, 2005-Nov-15 02:08:12 -0800, Rob wrote:
> > makeoptions DEBUG=-g
> > options INVARIANTS
> > options WITNESS
> > options WITNESS_KDB
> > options KDB
> > options DDB
> > options DDB_NUMSYM
> > options GDB
> >
> >Is that enough?
> 
> If your system is headless, you probably want
> 'options BREAK_TO_DEBUGGER' as well.
> 
> First question is: Does the system still deadlock? 
> INVARIANTS and WITNESS will have added sanity
> checks which might have picked up the problem.

Indeed, I have this in my DEBUG kernel config:

makeoptions     DEBUG=-g
options INVARIANT_SUPPORT
options INVARIANTS
options WITNESS
options WITNESS_KDB
options KDB
options DDB
options DDB_NUMSYM
options GDB
options BREAK_TO_DEBUGGER


and the deadlock disappears.
Does that already give a hint what's wrong?

If not, then what should I remove/keep from the
above list, to allow the deadlock to reappear and
still be able to debug the problem?

According to your info above, I would say I'd
remove INVARIANT_SUPPORT, INVARIANTS, WITNESS
and WITNESS_KDB; leave the others in there
and try again with such a debug kernel. Right?

Thanks,
Rob.


Rob.


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