Date: Wed, 7 Mar 2001 10:49:17 +1030 From: Greg Lehey <grog@lemis.com> To: Peter.Blok@inter.NL.net Cc: freebsd-stable@freebsd.org Subject: Re: DDB watch Message-ID: <20010307104917.O92844@wantadilla.lemis.com> In-Reply-To: <200102282359.AAA10244@altrade.nijmegen.inter.nl.net>; from Peter.Blok@inter.NL.net on Wed, Feb 28, 2001 at 11:59:46PM %2B0000 References: <200102282359.AAA10244@altrade.nijmegen.inter.nl.net>
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On Wednesday, 28 February 2001 at 23:59:46 +0000, Peter.Blok@inter.NL.net wrote: >> On Sunday, 25 February 2001 at 22:52:11 +0100, Peter Blok wrote: >>> Hi, >>> >>> I was trying to setup a "watch" in DDB. When it hits it, the kernel >>> reboots. Am I doing something wrong or isn't it working. I start up >>> with boot -d set a breakpoint somewhere, hits breakpoint and set >>> watchpoint. After the continue it crashes, without a backtrace. Just >>> a black screen and reboot. >> >> There are places where you can't set a breakpoint. An obvious place >> is in the ddb code: if you hit a breakpoint there, you're going to >> recurse to the top of the stack and crash. There are other less >> obvious places, and I suspect that's what you have hit. > > The location was ok. I suddenly realize it was on a dual cpu > system. Could SMP break the watch behavior? It shouldn't do. Greg -- Finger grog@lemis.com for PGP public key See complete headers for address and phone numbers To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message
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