freebsd stable - May 2010 - .zfs directory broken on an FS

I recently switched over to ZFS at work and it seems pretty good (so far at
least!) however I was writing a script to do snapshots and one of the file
systems now gives..

[cain 9:37] ~ >ls -la /usr/local/Genesis/archive/.zfs
ls: snapshot: Bad file descriptor
total 0

Other file systems in the same pool work fine though..
[cain 9:36] ~ >ll /usr/local/Genesis/MeteorData/.zfs/snapshot
total 4
drwxrwxr-x  32 metdata  radar  38 Mar 21 03:11 20100512-0900

(All other snapshot directories are OK)

I haven't tried rebooting it yet.

Any suggestions, or information to help debug it?

The system is..
FreeBSD cain.gsoft.com.au 8.0-STABLE FreeBSD 8.0-STABLE #0 r206332: Wed Apr  7
11:01:52 CST 2010     root@cain3.gsoft.com.au:/usr/obj/usr/src/sys/GENERIC 
amd64

--
Daniel O'Connor software and network engineer
for Genesis Software - http://www.gsoft.com.au
"The nice thing about standards is that there
are so many of them to choose from."
  -- Andrew Tanenbaum
GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C

Am 12.05.2010 um 02:09 schrieb Daniel O'Connor:
> I recently switched over to ZFS at work and it seems pretty good (so far at
least!) however I was writing a script to do snapshots and one of the file
systems now gives..
> 
> [cain 9:37] ~ >ls -la /usr/local/Genesis/archive/.zfs
> ls: snapshot: Bad file descriptor
> total 0
> 
> Other file systems in the same pool work fine though..
> [cain 9:36] ~ >ll /usr/local/Genesis/MeteorData/.zfs/snapshot
> total 4
> drwxrwxr-x  32 metdata  radar  38 Mar 21 03:11 20100512-0900
> 
> (All other snapshot directories are OK)
This appears to be a long standing issue with no solution.  I used to get this a
lot during daily rsync backups; since switching to a zfs send/recv based script
I don't get these problems anymore.

Be aware that trying to unmount that snapshot or it's filesystem might panic
or hang the system, including when you try to reboot.


Stefan

-- 
Stefan Bethke <stb@lassitu.de>   Fon +49 151 14070811