Bug 596384

Summary: VFS: Busy inodes after unmount issue. [rhel-5.5.z]
Product: Red Hat Enterprise Linux 5 Reporter: RHEL Program Management <pm-rhel>
Component: kernelAssignee: Jiri Pirko <jpirko>
Status: CLOSED ERRATA QA Contact: Red Hat Kernel QE team <kernel-qe>
Severity: urgent Docs Contact:
Priority: urgent    
Version: 5.4CC: akunysz, dhoward, dhowells, ikent, jlayton, jpirko, jwest, lmcilroy, pm-eus, rkhan, rwheeler, sprabhu, steved, tao, tkramer
Target Milestone: rcKeywords: ZStream
Target Release: ---   
Hardware: All   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
Doc Text:
When an NFS server exported a file system with an explicit "fsid=[file_system_ID]", an NFS client mounted that file system on one mount point and a subdirectory of that file system on a separate mount point, then if the server re-exported that file system after un-exporting and unmounting it, it was possible for the NFS client to unmount those mount points and receive the following error message: "VFS: Busy inodes after unmount..." Additionally, it was possible to crash the NFS client's kernel in this situation.
Story Points: ---
Clone Of: Environment:
Last Closed: 2010-07-01 18:28:32 UTC Type: ---
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Bug Depends On: 582321    
Bug Blocks:    

Description RHEL Program Management 2010-05-26 17:14:36 UTC
This bug has been copied from bug #582321 and has been proposed
to be backported to 5.5 z-stream (EUS).

Comment 3 Jiri Pirko 2010-06-07 13:31:58 UTC
in 2.6.18-194.6.1.el5

Comment 7 Douglas Silas 2010-06-28 20:26:05 UTC
Technical note added. If any revisions are required, please edit the "Technical Notes" field
accordingly. All revisions will be proofread by the Engineering Content Services team.

New Contents:
When an NFS server exported a file system with an explicit "fsid=[file_system_ID]", an NFS client mounted that file system on one mount point and a subdirectory of that file system on a separate mount point, then if the server re-exported that file system after un-exporting and unmounting it, it was possible for the NFS client to unmount those mount points and receive the following error message:

    "VFS: Busy inodes after unmount..."

Additionally, it was possible to crash the NFS client's kernel in this situation.

Comment 11 errata-xmlrpc 2010-07-01 18:28:32 UTC
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2010-0504.html