Date: Mon, 16 Feb 2004 01:26:42 -0500 From: Garance A Drosihn <drosih@rpi.edu> To: Kris Kennaway <kris@obsecurity.org>, alpha@freebsd.org, current@freebsd.org Subject: Re: Scheduling deadlock on alpha? Message-ID: <p06020418bc5610a80c22@[128.113.24.47]> In-Reply-To: <20040216055840.GA72555@xor.obsecurity.org> References: <20040216055840.GA72555@xor.obsecurity.org>
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At 9:58 PM -0800 2/15/04, Kris Kennaway wrote: >One of the alpha package machines seems to have deadlocked; no >processes are running, but the kernel itself responds to pings, >and I can break to DDB: ...etc... > >WITNESS was not enabled, and the machines are running > >FreeBSD axp1.FreeBSD.org 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Wed Jan >21 13:30:26 PST 2004 >kris@bento.FreeBSD.org:/local0/obj/alpha/a/asami/portbuild/alpha/src-client/sys/NETBOOT >alpha > >Scheduler is 4BSD. Hmm. Interesting. UP or SMP? As an interesting coincidence, I had my dual-Athlon machine lock up on me at about 5am on Sunday. I didn't realize it was down until I needed to use that machine for something, so I just rebooted the machine without doing much investigation. I had to turn the machine off and back on to get it's attention (ctrl-alt- delete was ignored). WITNESS is not enabled, and the machine is running: FreeBSD santropez.netel.rpi.edu 5.2-CURRENT FreeBSD 5.2-CURRENT #0: Wed Jan 21 23:28:30 EST 2004 root@santropez.netel.rpi.edu:/usr/obj/usr/src/sys/Dual-Athlon2k i386 The machine had run continuously from the time I did that last installworld/installkernel, without any reboots. It was running some Folding@Home clients, so it would have racked up a lot of CPU time. Other than those clients, it should have been pretty idle for a few hours before it hung up. It NFS-exports some directories to another system, but that other system did not have the directories mounted at the time of the crash. I really doubt it's related, but it is interesting that both machines happen to have kernels from the same day... -- Garance Alistair Drosehn = gad@gilead.netel.rpi.edu Senior Systems Programmer or gad@freebsd.org Rensselaer Polytechnic Institute or drosih@rpi.edu
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