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Date: Mon, 23 Jan 2012 18:56:08 +0200
From: Andriy Gapon <avg@FreeBSD.org>
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To: Gleb Smirnoff <glebius@FreeBSD.org>
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Cc: current@FreeBSD.org
Subject: Re: new panic in cpu_reset() with WITNESS
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on 23/01/2012 18:46 Gleb Smirnoff said the following:
> On Mon, Jan 23, 2012 at 06:43:23PM +0200, Andriy Gapon wrote:
> A> > db> bt
> A> > Tracing pid 1 tid 100001 td 0xfffffe0001d5e000
> A> > kdb_enter() at kdb_enter+0x3b
> A> > panic() at panic+0x1c7
> A> > _mtx_lock_spin_flags() at _mtx_lock_spin_flags+0x10f
> A> > cnputs() at cnputs+0x7a
> A> > vprintf() at vprintf+0xcb
> A> > printf() at printf+0x67
> A> > db_putc() at db_putc+0x81
> A> 
> A> Ah, db_putc does something different from what I expected.
> A> Can you hack it to never use printf?
> 
> Just cut printfs from db_putc()?

Make the following condition be always false:

if (!kdb_active || ddb_use_printf) {

E.g.:

if (0) {

:-)
-- 
Andriy Gapon