Date: Tue, 19 Mar 2002 14:43:30 -0700 From: "Kenneth D. Merry" <ken@kdm.org> To: Josef Karthauser <joe@tao.org.uk> Cc: hackers@FreeBSD.ORG Subject: Re: Kernel debugger and X11. Message-ID: <20020319144329.A44361@panzer.kdm.org> In-Reply-To: <20020319213623.GA7786@genius.tao.org.uk>; from joe@tao.org.uk on Tue, Mar 19, 2002 at 09:36:23PM %2B0000 References: <20020319201528.GI4989@genius.tao.org.uk> <20020319143448.A44276@panzer.kdm.org> <20020319213623.GA7786@genius.tao.org.uk>
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On Tue, Mar 19, 2002 at 21:36:23 +0000, Josef Karthauser wrote:
> On Tue, Mar 19, 2002 at 02:34:48PM -0700, Kenneth D. Merry wrote:
> >
> > > Does anyone have any working practices around this problem? I'm sure
> > > that I'm not the only one of us with it.
> >
> > I would recommend just enabling crash dumps; then it doesn't matter if
> > you're in X when the machine panics, and you can get a stack trace and look
> > at things once the machine reboots.
> >
>
> I suppose. Is it possible to switch the debugger off via a sysctl,
> without compiling it out?
From sys/kern/kern_shutdown.c:
#ifdef DDB
#ifdef DDB_UNATTENDED
int debugger_on_panic = 0;
#else
int debugger_on_panic = 1;
#endif
SYSCTL_INT(_debug, OID_AUTO, debugger_on_panic, CTLFLAG_RW,
&debugger_on_panic, 0, "Run debugger on kernel panic");
#endif
So you should be able to turn it off with debug.debugger_on_panic.
From a grep through the tree, it looks like only i386 and powerpc look
at that variable.
Ken
--
Kenneth Merry
ken@kdm.org
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