Return-Path: linux-nfs-owner@vger.kernel.org Received: from mail-oa0-f42.google.com ([209.85.219.42]:55614 "EHLO mail-oa0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751069AbaEWCqa (ORCPT ); Thu, 22 May 2014 22:46:30 -0400 Received: by mail-oa0-f42.google.com with SMTP id j17so4946339oag.15 for ; Thu, 22 May 2014 19:46:30 -0700 (PDT) Message-ID: <537EB673.3050302@gmail.com> Date: Fri, 23 May 2014 10:46:11 +0800 From: Kinglong Mee MIME-Version: 1.0 To: Trond Myklebust CC: Linux NFS Mailing List , kinglongmee@gmail.com Subject: Re: Get "device is busy" when umounting nfsv4 file References: <537EAF05.2020900@gmail.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8 Sender: linux-nfs-owner@vger.kernel.org List-ID: On 5/23/2014 10:18, Trond Myklebust wrote: > > On May 22, 2014 10:14 PM, "Kinglong Mee" > 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