kern/131342: [nfs] mounting/unmounting of disks causes NFS to fail

Martin Birgmeier martin at email.aon.at
Tue Feb 3 07:30:07 PST 2009


>Number:         131342
>Category:       kern
>Synopsis:       [nfs] mounting/unmounting of disks causes NFS to fail
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Tue Feb 03 15:30:05 UTC 2009
>Closed-Date:
>Last-Modified:
>Originator:     Martin Birgmeier
>Release:        FreeBSD 7.1-RELEASE i386
>Organization:
MBi at home
>Environment:
System: FreeBSD gandalf.xyzzy 7.1-RELEASE FreeBSD 7.1-RELEASE #0: Sun Jan 4 10:53:24 CET 2009 root at atpcdvvc.xyzzy:/usr/VOL/OBJ/FreeBSD/RELENG_7_1_0_RELEASE/src/sys/XYZZY i386

>Description:
	[Please note that the email address given is not valid due to
	security reasons. Just reply to the gnats entry, and I'll follow
	it via the web interface.]

	Machine A is serving via NFS. When unmounting (probably also
	mounting) an unrelated file system on A, B will get a EPERM
	error if it is simultaneously accessing files on A via NFS.

	I have seen this behavior at least since 5.x, probably before.

>How-To-Repeat:
	Do heavy NFS i/o from machine B to machine A, then unmount (mount)
	a file system on A. B will get an error.

>Fix:
	Unknown.

>Release-Note:
>Audit-Trail:
>Unformatted:


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