Date: Tue, 26 Oct 2004 13:00:51 +0100 (BST) From: Robert Watson <rwatson@freebsd.org> To: =?iso-8859-2?q?S=B3awek_=AFak?= <zaks@prioris.mini.pw.edu.pl> Cc: current@freebsd.org Subject: Re: Hard hangs on AMD64 with mpsafenet enabled Message-ID: <Pine.NEB.3.96L.1041026125447.3203d-100000@fledge.watson.org> In-Reply-To: <86k6tdeq84.fsf@thirst.unx.era.pl>
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Thanks for the report -- I have some questions below that it would be helpful if you could answer. On Tue, 26 Oct 2004, [iso-8859-2] Sławek Żak wrote: > I've got a Sun V20z 2 cpu Opteron box. I experience hard hangs when > accessing NFS simulatneously from 2 processes (tested with parallel port > builds with /usr/ports mounted over NFS with > nosuid,nodev,soft,bg,intr). rpc.lockd and rpc.statd are both enabled for > NFS. From the above, can I assume that this is a problem on the NFS client, and that the NFS server is on another system reachable via a local area network? When "hung", can the machine be pinged from another machine? From your subject line, it looks like you mean "when debug.mpsafenet=0, this doesn't happen". Is that a correct reading? Could you try running with WITNESS and INVARIANTS enabled, and see if you get any specific warnings or assertion failures? A hard hang could imply a deadlock, which WITNESS would be able to report on. Other sources of hard hangs may be easier to debug with INVARIANTS and WITNESS enabled. If possible, getting access to a serial console might make this problem significantly easier to debug. > I cannot also enter the debugger with C-M-ESC (no serial console at this > moment, sorry). When the system is running and I try to enter the debugger > on video console I get garbage on the screen and a reboot immediately > after. Scary stuff. I can't play with MP watchdog now (4 CPU box arrives in > two weeks). So when there isn't a problem and you try to enter the debugger on the video console, you get the garbage, or only when this problem is manifesting? Thanks, Robert N M Watson FreeBSD Core Team, TrustedBSD Projects robert@fledge.watson.org Principal Research Scientist, McAfee Researchhelp
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