Can't unmount broken nfs mount

Can't unmount broken nfs mount

[Phillip Susi]

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Forwarding from debian bug #711183:

User reports that a broken nfs mount has its mounted directory in
/proc/mounts renamed from /foo to /foo\040(deleted) when an nfs mount
is broken due to an unreachable server, and this prevents unmounting
it since umount can not find "/foo" in /proc/mounts.  Is this a kernel
bug, or something that umount needs to work around?

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Re: Can't unmount broken nfs mount

[Karel Zak]

On Mon, Feb 10, 2014 at 06:25:05PM -0500, Phillip Susi wrote:
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> Hash: SHA512
> 
> Forwarding from debian bug #711183:
> 
> User reports that a broken nfs mount has its mounted directory in
> /proc/mounts renamed from /foo to /foo\040(deleted) when an nfs mount
> is broken due to an unreachable server, and this prevents unmounting
> it since umount can not find "/foo" in /proc/mounts.  Is this a kernel
> bug, or something that umount needs to work around?

 I don't think this is a kernel bug, we already support "(deleted)" for
 /proc/swaps in libmount. All we need is to improve  libmount/src/tab_parse.c 
 to supports this suffix in mount tables too.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com

Re: Can't unmount broken nfs mount

[Karel Zak]

On Mon, Feb 10, 2014 at 06:25:05PM -0500, Phillip Susi wrote:
> Forwarding from debian bug #711183:
> 
> User reports that a broken nfs mount has its mounted directory in
> /proc/mounts renamed from /foo to /foo\040(deleted) when an nfs mount
> is broken due to an unreachable server, and this prevents unmounting
> it since umount can not find "/foo" in /proc/mounts.  Is this a kernel
> bug, or something that umount needs to work around?

I have improved the mountinfo libmount parser, now it removes the
"\040(deleted)" from the target path. You can try it with NFS.

    Karel

-- 
 Karel Zak  <kzak@redhat.com>
 http://karelzak.blogspot.com