Date: Thu, 07 Nov 2002 15:32:31 -0800 From: "Joel M. Baldwin" <qumqats@outel.org> To: current@FreeBSD.ORG Subject: Re: dnet causes Hard Lock on SMP kernel? ( was 'Why is my -current system Hard Locking?' ) Message-ID: <164078752.1036683151@[192.168.1.20]>
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--On Thursday, November 07, 2002 6:07 PM -0500 Ray Kohler <ataraxia@cox.net> wrote: >> From owner-freebsd-current@FreeBSD.ORG Thu Nov 7 18:00:10 2002 >> Date: Thu, 07 Nov 2002 14:47:03 -0800 >> From: "Joel M. Baldwin" <qumqats@outel.org> >> To: current@FreeBSD.ORG >> Subject: dnet causes Hard Lock on SMP kernel? ( was 'Why is my >> -current system Hard Locking?' ) >> >> >> The BIG thing is that I now have a sure fire way of forcing >> a Hard Lock. Every time I run the distributed.net client >> 'dnet' the system hard locks. BUT ONLY ON A SMP KERNEL! >> I have a non SMP kernel running and things so far >> seem stable. Running the system with only 1 CPU is slow, >> so it'll take a while for me to be sure. >> >> So the questions now are. >> 1.) What is dnet doing that is Hard Locking the system? >> 2.) Is the dnet problem the same as what has been causing >> my Hard Locks all along? > > Just a guess, but maybe your system locks up every time the > CPU usage gets very high under SMP? That's one thing dnetc > is guaranteed to do. Do other CPU-intensive operations do > it? (Maybe you said earlier, but I haven't been following > this thread.) > > - @ I've run dnet reliably before. I'm assuming the Hard Lock problem is threads related, but at this point who knows. A more heavily load system seems to increase the chances of a Hard Lock. But it HAS happened with nothing going on. Well, relatively nothing, this system does real work so its never completely idle. The important thing is I can now force a Hard Lock simply by running a program. This is something that shouldn't happen and needs to be solved. With any luck this will also solve my stability problem. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message
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