Fatal trap 12 on ZFS in 8.0-RC1
doug at polands.org
Mon Oct 26 15:00:32 UTC 2009
On Oct 25, 2009, at 1:07, Thomas Backman <serenity at exscape.org> wrote:
> On Oct 25, 2009, at 3:10 AM, Doug Poland wrote:
>> 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
>> filesystem tests so starting playing with vm.kmem_size.
>> I finally got unixbench through the first 6 Filesystem Throughput
>> tests with:
>> 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
>> 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.
> 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.
Thank you, that worked nicely.
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