Date: Tue, 28 Jul 2009 09:48:39 -0700 From: Marcel Moolenaar <xcllnt@mac.com> To: Anton Shterenlikht <mexas@bristol.ac.uk> Cc: freebsd-ia64@freebsd.org Subject: Re: FreeBSD 8.0-BETA2/amd64 crashes on SMP under load Message-ID: <0C915045-02B9-4E88-8FA8-B2405B8712A6@mac.com> In-Reply-To: <20090728161255.GA38375@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> <E5F6DAD4-43C0-47DF-ACB1-324D3B15EC79@mac.com> <20090728161255.GA38375@mech-cluster241.men.bris.ac.uk>
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On Jul 28, 2009, at 9:12 AM, Anton Shterenlikht wrote: > On Tue, Jul 28, 2009 at 08:34:52AM -0700, Marcel Moolenaar wrote: >> >> 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. > > yes.. I thought of this myself. I guess I ought to check > the Event Logs available from MP on rx2600. But those messages > are so cryptic.. The event logs are also mostly useless IMO. They fill up the log buffer and then cause warnings during the boot. I typically use the errdump command in EFI to see if there's anything fishy. > >> Check for MCA records. > > # mca > mca: no error records found > > # sysctl hw.mca > hw.mca.last: 0 > hw.mca.first: 0 > hw.mca.count: 0 Hmmmm... I don't know what to make of this yet. I've always had MCAs when there were spontaneous reboots. The lack of MCAs can point to something else than hardware... -- Marcel Moolenaar xcllnt@mac.com
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