Date: Mon, 02 Jan 2006 11:48:12 +0100 From: Armin Pirkovitsch <a.pirko@inode.at> To: Robert Watson <rwatson@FreeBSD.org> Cc: freebsd-hackers@freebsd.org Subject: Re: Deadlock FreeBSD 6 / 7 Message-ID: <43B904EC.8010700@inode.at> In-Reply-To: <20060102060259.X2892@fledge.watson.org> References: <43B6C134.6060802@inode.at> <20060101163522.Y74401@fledge.watson.org> <43B85C33.90000@inode.at> <20060102060259.X2892@fledge.watson.org>
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Robert Watson wrote: > > On Sun, 1 Jan 2006, Armin Pirkovitsch wrote: > >> Robert Watson wrote: >> >>>> I guess one of those parts creates the trouble, but I have no idea >>>> how to trace it... Is there a way to run the whole thing in some >>>> kind of debugger? Or is there a diffrent way to locate the problem? >>> >>> >>> The usual first step to debug a deadlock, if WITNESS or INVARIANTS >>> doesn't trigger dropping you into the debugger, is to break into the >>> debugger using a console or serial break. To do this, you need to >>> compile: >> >> >> I added options BREAK_TO_DEBUGGER and used make buildkernel and make >> installkernel.debug and was not able to reconstruct the crash. I guess >> the debug stuff slowed it down enough to not come to the bug... (even >> installworld worked fine, which usually kills it) So this is what I >> feared - the debug stuff changes the timing by slowing it down which >> makes it pretty hard to reconstruct the crash... Is there any other >> way? (btw. it's a notebook, so there is no old serial bus) > > > Try compiling in only options DDB and BREAK_TO_DEBUGGER. Even without > the fully debugging features on, it may be enough to give us some > initial insight into the source of the problem. without installkernel.debug (just installkernel) I was able to reconstruct the crash, but again was not able to enter the debugger. > Does your notebook have firewire support? Yes it has and one my other machines has too if that is any help? -- Armin Pirkovitsch a.pirko@inode.at
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