ZFS lockup in "zfs" state

  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.

FreeBSD: 7-STABLE 2008-04-29
ARCH: amd64
RAM: 6 GB
ZFS: prefetch disabled
vm.kmem_size_max="1073741824"
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On Sat, 10 May 2008 07:03:05 +0200
Martin Matuska <mmFreeBSD.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.m
sk.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
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> 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.

FWIW, I've seen it a few more times on two different
machines. Both running 
semi-new FreeBSD (I still don't think I ever saw this on
earlier CURRENT:s).

In the case of both machines, the machine is only
selectively hung. Possibly 
limited to the zfs file system - definitely not global to
the pool. A remote 
reboot -q -n has been useful to recover without console
access.

In both of these cases, more or less all activity of any
amount is on ZFS file 
systems. One of them has only ZFS except for swap on a UFS
file system. The 
other has root on UFS, but no bulk operations whatsoever
happening (beyond 
the usual periodics) except on ZFS.

No NFS on either machine.

-- 
/ Peter Schuller

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