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From: Michel Le Cocq <lecocq@ipgp.fr>
To: freebsd-bugs@FreeBSD.org
Subject: FreeBSD 13.1 : ZFS NFS : .zfs/snapshot : Stale file handle : with
zfs destroy snapshot process in Uninterruptible sleep
Date: Wed, 07 Sep 2022 16:50:06 +0200
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Hi, since upgrading to 13.1-RELEASE of FreeBSD I can't anymore access to
.zfs/snapshot folder over NFS.
When I tried to acces do .zfs/snapshot over NFS I obtain a 'Stale file
handle'.
Worse : Then if you tried to delete the snapshot that was accessed, you
'zfs destroy snapshot' process will fall in 'Uninterruptible sleep'
(usually IO). So you can't kill it !
I post this bug here :
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=266236
A little small procedure to reproduce this bug.
Install a fresh FreeBSD server under 13.1-p2
root@server:~# freebsd-version
13.1-RELEASE-p2
Inside a zfs pool create a vol and share it by NFS.
root@server:~# zfs get name,mountpoint,sharenfs tank/zfsnfstest
NAME PROPERTY VALUE SOURCE
tank/zfsnfstest name tank/zfsnfstest -
tank/zfsnfstest mountpoint /tank/zfsnfstest local
tank/zfsnfstest sharenfs on local
Mount localy your sharenfs vol.
root@server:~# mount -t nfs 127.0.0.1:/tank/zfsnfstest /mnt
Create a snapshot.
root@server:~# zfs snapshot tank/zfsnfstest@1
Check you can access localy.
root@server:~# ls -l /tank/zfsnfstest/.zfs/snapshot/1/
total 0
root@server:~#
Try to acces from mounted NFS vol.
root@server:~# ls -l /mnt/.zfs/snapshot/1/
total 0
ls: /mnt/.zfs/snapshot/1/: Stale NFS file handle
Here we see we don't have access from NFS.
Try to remove your previous created snapshot.
root@server:~# zfs destroy tank/zfsnfstest@1
This process didn't end...
root@server:~ # ps aux
USER PID %CPU %MEM VSZ RSS TT STAT STARTED TIME COMMAND
[...]
root 58027 0.0 0.0 18012 7256 1 D+ 12:27 0:00.01 zfs destroy tank/zfsnfstest@1
D mean : Uninterruptible sleep (usually IO). So you can't kill it !
root@server:~ # kill 58027
root@server:~ # ps aux | grep 58027
root 58027 0.0 0.0 18012 7256 1 D+ 12:27 0:00.01 zfs destroy tank/zfsnfstest@1
root@server:~ # kill -1 58027
root@server:~ # ps aux | grep 58027
root 58027 0.0 0.0 18012 7256 1 D+ 12:27 0:00.01 zfs destroy tank/zfsnfstest@1
root@server:~ # kill -9 58027
root@server:~ # ps aux | grep 58027
root 58027 0.0 0.0 18012 7256 1 D+ 12:27 0:00.01 zfs destroy tank/zfsnfstest@1
root@server:~ #
Thanks.
--
M