Date: Mon, 13 Feb 2006 13:09:54 -0500 From: John Baldwin <jhb@freebsd.org> To: freebsd-alpha@freebsd.org Subject: Re: SMP problem on UP2000+ Message-ID: <200602131309.55865.jhb@freebsd.org> In-Reply-To: <87u0b35fwp.wl%rand@meridian-enviro.com> References: <87u0b35fwp.wl%rand@meridian-enviro.com>
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On Monday 13 February 2006 12:26, Douglas K. Rand wrote: > I have a UP2000+ system from Microway with two 833 MHz CPUs, and it > keeps freezing up on me when I run it with a SMP kernel. The hangs > always seem to come at times of high disk IO, such as nightly backups > or heavy MySQL usage or buildworlds. (The system does my cacti > resource graphing.) I've got a debug kernel installed, but I can > never break into the kernel nor do I ever get a core dump. I've > experienced this problem with both 6.0 and 6_RELENG. > > I'm coming up on 4 days of uptime with a kernel that doesn't have SMP > which is easily four times that of a kernel with SMP. > > I was running a gmirror of two 75 GB SCSI disks on the onboard > controller, and to simply see if it was a factor I destroyed the > mirror and am now only using one disk. I had hangs both with and with > gmirror. > > Here are the messgaes I get on the console, when I get them. Sometimes > the system simply hangs. > > panic: lockmgr: thread 0xfffffc007d9c4d20, not exclusive lock holder > 0xfffffc007d9d5260 unlocking cpuid = 1 Have you tried disabling debug.mpsafevfs? Set it to 0 in the loader. -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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