Date: Wed, 29 Jul 2009 18:34:15 -0400 From: "Alexandre \"Sunny\" Kovalenko" <gaijin.k@gmail.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: <1248906855.1459.8.camel@RabbitsDen> 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 Tue, 2009-07-28 at 15:45 +0100, 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.. > Before you go down that path, which, IMHO, is as counterproductive as it is incorrect, could you, please, show the output of sysctl debug | grep panic and check whether output of savecore -vC makes sense to you. -- Alexandre Kovalenko (Олександр Коваленко)
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