Date: Tue, 28 Jul 2009 15:45:55 +0100 From: Anton Shterenlikht <mexas@bristol.ac.uk> To: "O. Hartmann" <ohartman@zedat.fu-berlin.de> Cc: "O. Hartmann" <ohartman@mail.zedat.fu-berlin.de>, freebsd-current@freebsd.org, freebsd-ia64@freebsd.org Subject: Re: FreeBSD 8.0-BETA2/amd64 crashes on SMP under load Message-ID: <20090728144555.GD75439@mech-cluster241.men.bris.ac.uk> In-Reply-To: <4A6F09BA.2020703@zedat.fu-berlin.de> 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>
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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.. -- Anton Shterenlikht Room 2.6, Queen's Building Mech Eng Dept Bristol University University Walk, Bristol BS8 1TR, UK Tel: +44 (0)117 928 8233 Fax: +44 (0)117 929 4423
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