Date: Mon, 26 Oct 2009 09:36:52 -0500 From: Doug Poland <doug@polands.org> To: Thomas Backman <serenity@exscape.org> Cc: "freebsd-current@freebsd.org" <freebsd-current@freebsd.org> Subject: Re: Fatal trap 12 on ZFS in 8.0-RC1 Message-ID: <67BF95AE-2294-4249-9F22-487E6652E53E@polands.org> In-Reply-To: <2D80E5CB-71E5-4F4F-A84B-A95C18B50F47@exscape.org> References: <46e678eb1eeca98033b15979e034a765.squirrel@email.polands.org> <2D80E5CB-71E5-4F4F-A84B-A95C18B50F47@exscape.org>
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On Oct 25, 2009, at 1:07, Thomas Backman <serenity@exscape.org> wrote: > On Oct 25, 2009, at 3:10 AM, Doug Poland wrote: > >> Hello, >> >> I'm experimenting with ZFS on 8-0-RC1 (amd64) in a VMWare virtual >> machine w/2GB RAM. In installed ZFS on GPT root using the excellent >> instructions at http://wiki.freebsd.org/RootOnZFS/GPTZFSBoot/RAIDZ1. >> >> All was well until I tried some benchmarking with >> benchmarks/unixbench. I kept getting kmem_map too small panics on >> the >> filesystem tests so starting playing with vm.kmem_size. >> >> I finally got unixbench through the first 6 Filesystem Throughput >> tests with: >> vm.kmem_size="1296M" >> vm.kmem_size_max="1296M" >> vfs.zfs.arc_max="128M" >> vfs.zfs.vdev.cache.size="24M" (i think) >> >> Unfortunately, ZFS paniced with: >> Fatal trap 12: page fault while in kernel mode. Now, when I attempt >> to >> restart the VM, as soon as the "boot menu" is gone, I immediately get >> the same Fatal trap 12 panics again and cannot get past this point. >> >> I've got the 8.0-RC1 DVD and can run Fixit, but have no idea how to >> repair this broken ZFS installation. Suggestions welcome. > > You should be able to break into the loader prompt (choice #6 IIRC) > and do > unset vm.kmem_size > unset vm... > ... etc. > boot > > That way, you'll be back to the earlier panics, but at least it'll > boot. Oh, and the settings aren't permanent, so make editing /boot/ > loader.conf your first prority. > > Regards, > Thomas Thank you, that worked nicely.
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