zfs kernel panic

Thomas Backman serenity at exscape.org
Tue Sep 8 15:39:47 UTC 2009

On Sep 8, 2009, at 5:23 PM, Gerrit Kühn wrote:

> Hi folks,
> I just upgraded a zfs server from 7.0-something to 7.2-stable and  
> hoped to
> get rid of some minor instabilities I experienced every 6 months or  
> so.
> Unfortunately, the new system crashed for the first time after only  
> a few
> hours when copying some files via scp onto it.
> I got a kernel panic which looked quite similar to the one reported  
> here
> (kmem_map too small):
> <http://www.archivum.info/freebsd-fs@freebsd.org/2009-04/00071/FreeBSD_7.2-RC1_-_ZFS_related_kernel_panic_quot_kmem_map_too_small_quot 
> >
> I have a dual cpu dual core opteron system with 4GB of RAM and a 3- 
> disk
> raidz1. I took out the memory settings from loader.conf as suggested  
> in
> UPDATING. I did not yet upgrade zpool nor zfs version (would that  
> help?).
> Are there any known issues or any further hints what might cause the
> crash? I copied the files again, but this time everything went fine.
Hmm. Do you use i386 or amd64? This panic is (was?) pretty common on  
i386 before tuning, but... 4GB RAM and an Opteron should have you  
running amd64, no?


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