ZFS lockup in "zfs" state

[Peter Schuller]

> 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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