Date: Tue, 28 Jul 2009 08:34:52 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-current@freebsd.org, "O. Hartmann" <ohartman@zedat.fu-berlin.de>, freebsd-ia64@freebsd.org Subject: Re: FreeBSD 8.0-BETA2/amd64 crashes on SMP under load Message-ID: <E5F6DAD4-43C0-47DF-ACB1-324D3B15EC79@mac.com> In-Reply-To: <20090728144555.GD75439@mech-cluster241.men.bris.ac.uk> References: <4A6DB30B.20705@zedat.fu-berlin.de> <4A6DB9F1.7050404@haruhiism.net> <4A6E0620.6070200@mail.zedat.fu-berlin.de> <20090727210428.GA30253@mech-cluster241.men.bris.ac.uk> <20090728103545.GA22380@mech-cluster241.men.bris.ac.uk> <4A6F09BA.2020703@zedat.fu-berlin.de> <20090728144555.GD75439@mech-cluster241.men.bris.ac.uk>
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On Jul 28, 2009, at 7:45 AM, Anton Shterenlikht wrote: > On Tue, Jul 28, 2009 at 02:22:50PM +0000, O. Hartmann wrote: >> Anton Shterenlikht wrote: >>> On Mon, Jul 27, 2009 at 10:04:28PM +0100, Anton Shterenlikht wrote: >>>> On Mon, Jul 27, 2009 at 09:55:12PM +0200, O. Hartmann wrote: >>>>> Kamigishi Rei wrote: >>>>>> O. Hartmann wrote: >>>>>>> I have the problem of crashing FreeBSD 8.0-BETA2/amd64 under >>>>>>> load on >>>>>>> all of our SMP boxes. Is there an issue known at the moment? >>>>>>> If not, I >>>>>>> will prepare the kernel for whitnessing and provide more >>>>>>> informations, >>>>>>> if you wish. >>>>>> A quick question: what is in the crash message, i.e. the >>>>>> backtrace? >>>>>> And what kind of crash is it - a panic() or a fatal trap? >>>>> On the 8-core server box, I sometimes see : >>>>> >>>>> Fatal trap 12: page fault while in kernel mode >>>>> fault code = supervisor read, page not present >>>> Not sure if it's related, but on ia64 SMP (2 cpus) with 8.0- >>>> current and >>>> later with 8.0-beta1 (I havent' built beta2 yet) I'm getting >>>> crashes >>>> under load every so often. E.g buildworld -j8 is likely to crash >>>> the >>>> box. No messages, just a sudden freeze, no backtrace or panic, >>>> and then reboot. >>>> >>>> If load is less heavy, e.g. fewer processes and some idle time, the >>>> problem doesn't seem to appear. >>>> >>>> I'm happy to do any further testing, if suggested. >>> >>> my ia64 8.0-beta1 SMP box died again on >>> make -j8 buildworld >>> with no panic or log entries. >>> >>> Is it possible that some kernel variable needs to >>> be increased? E.g. kern.maxproc, kern.maxfiles, etc. >>> Or perhaps I'm talking complete rubbish.. >>> >> >> I suggest you try again with a UP kernel - a suggestion from a >> kernel-nnob, sorry. My SMP boxes work now with UP-kernel, but they >> are >> really slowish although they have modern Intel C2D/Penryn cores. > > I need SMP for OpenMP codes. It's a shame if SMP is buggy, but > I guess all is down to small user base.. I have no problems with SMP. If you don't have a panic, then you may have a hardware problem. Check for MCA records. -- Marcel Moolenaar xcllnt@mac.com
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