Date: Fri, 16 Sep 2022 11:02:40 +0200 From: Michel Le Cocq <lecocq@ipgp.fr> To: freebsd-fs@FreeBSD.org Subject: Fwd: FreeBSD 13.1 : ZFS NFS : .zfs/snapshot : Stale file handle : with zfs destroy snapshot process in Uninterruptible sleep Message-ID: <87pmfvadss.fsf@ipgp.fr> References: <s3mk06f5x6m.fsf@ipgp.fr>
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Hi push here this following bug, which si specific FS. in short, since FreeBSD 13.1 a ZFS exported FS over NFS will hang if a NFS client tried to acces to a snapshot. see bellow my post to freebsd-bug. -- M Michel Le Cocq <lecocq@ipgp.fr> writes: > 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.
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