Re: Get "device is busy" when umounting nfsv4 file

[Kinglong Mee <kinglongmee@gmail.com>]

On 5/23/2014 10:18, Trond Myklebust wrote:
> 
> On May 22, 2014 10:14 PM, "Kinglong Mee" <kinglongmee@gmail.com <mailto:kinglongmee@gmail.com>> wrote:
>>
>> When using NFSv4 on Fedora 20 with latest kernel (3.15.0-rc6+),
>> I can't umount the mountpoint after only an 'ls' operation.
>>
>> [root@localhost ~]# cat /etc/exports
>> /nfstest        *(rw,no_root_squash,no_subtree_check,insecure)
>> [root@localhost ~]# mount -t nfs 127.0.0.1:/ /mnt/
>> [root@localhost ~]# ls /mnt/
>> nfstest
>> [root@localhost ~]# umount /mnt/
>> umount.nfs4: /mnt: device is busy
> 
> Hi Kinglong
> 
> Nothing springs out to me. Could you please bisect?

Trying it on rhel7 with 3.10.0-121.el7.x86_64, 
also got "device is busy".
[root@localhost ~]# umount /mnt/
umount.nfs4: /mnt: device is busy

Maybe this problem has exist a long time.

thanks,
Kinglong Mee