Bug 731635

Summary: fail to umount with endless rpc messge
Product: Red Hat Enterprise Linux 6 Reporter: Jian Li <jiali>
Component: kernelAssignee: Red Hat Kernel Manager <kernel-mgr>
Status: CLOSED NOTABUG QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 6.2CC: bfields, dhowells, jlayton, nmurray, rwheeler, sprabhu, steved
Target Milestone: rc   
Target Release: ---   
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
Story Points: ---
Clone Of: Environment:
Last Closed: 2011-08-18 12:36:19 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Attachments:
Description Flags
cyclic RPC debug message none

Description Jian Li 2011-08-18 07:23:05 UTC 
Description of problem:
I want to test export option 'hide', so ,I create /etc/exports:

====
/tmp *(rw,no_root_squash,hide)
/tmp/test *(rw,no_root_squash)
/etc *(rw,no_root_squash)
====

Then, mount shared directories,
#mount -o vers=4 localhost:/etc /tmp/test
#mount -o vers=4 localhost:/tmp /mnt/test

Then , check that 'hide' work fine, and umount
#umount /mnt/test
#umount /mnt/test  <=== error

[root@ibm-ls22-01 ~]# umount /tmp/test
umount.nfs: /tmp/test: device is busy
umount.nfs: /tmp/test: device is busy
[root@ibm-ls22-01 ~]# service nfs stop
Shutting down NFS mountd: [  OK  ]
Shutting down NFS daemon: [  OK  ]
Shutting down NFS quotas: [  OK  ]
^C

And I open rpcdebug, find that RPC prints cyclic debug message.(attacked)


Version-Release number of selected component (if applicable):
2.6.32-188.el6.x86_64
nfs-utils-1.2.3-7.el6.x86_64
Comment 1 Jian Li 2011-08-18 07:25:31 UTC 
Created attachment 518810 [details]
cyclic RPC debug message
Comment 2 Jian Li 2011-08-18 07:26:10 UTC 
ops :    cyclic debug message.(attached)
Comment 4 Jian Li 2011-08-18 07:41:36 UTC 
I have use 'hide' wrongly, this bug should have nothing with 'hide', it may be caused by config file in /etc.
Comment 5 Jian Li 2011-08-18 07:52:19 UTC 
If I delete '/tmp/test *(rw,no_root_squash)', I could umount /tmp/test successfully. Maybe this is not a bug!
Comment 6 J. Bruce Fields 2011-08-18 12:36:19 UTC 
Right, you're not expected to be able to unmount exported filesystems.

Also, it looks like you're trying to re-export nfs (by mounting an nfs filesystem at /tmp/test, and also exporting /tmp/test).  That's not expected to work either.