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Date: Wed, 14 May 2008 20:56:15 +0400
From: Stanislav Sedov <stas@FreeBSD.org>
To: Martin Matuska <mm@FreeBSD.org>
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Cc: freebsd-fs@FreeBSD.org
Subject: Re: ZFS lockup in "zfs" state
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On Sat, 10 May 2008 07:03:05 +0200
Martin Matuska <mm@FreeBSD.org> mentioned:

>   Hi,
> 
> I just experienced the same lockup in zfs state as other people did 
> (Ivan Voras, Peter Schuller) - UFS filesystems still intact.
> There was heavy backup tar/gzip activity on the filesystem (read-only, 
> write was to NFS) and lots of reads via NFS, the server was doing this 
> job without problems for 11 days.
> 

The following patch, published some time ago by pjd helped
me:
http://mbsd.msk.ru/dist/zfs_lockup.diff

100+ days of uptime of heavily loaded machines and no problems
so far.

Hope it would help.

-- 
Stanislav Sedov
ST4096-RIPE