Re: [fuse-devel] fusermount reports "Device or resource busy" but unmounts it anyway

["Richard W.M. Jones" <rjones@redhat.com>]

On Wed, May 13, 2015 at 10:27:09AM +0200, Miklos Szeredi wrote:
> [CCs added]
> 
> On Tue, May 12, 2015 at 11:34 AM, Richard W.M. Jones <rjones@redhat.com> wrote:
> >
> > Has something changed in FUSE / the kernel in the past few months so
> > that 'fusermount -u /mp' reports the error:
> >
> >   fusermount: failed to unmount /mp: Device or resource busy
> >
> 
> That's from the umount2() syscall, and most likely not a fuse issue.
> 
> > and returns a non-zero exit code, but the mountpoint is unmounted
> > anyway?
> 
> Is this in 4.1-rc?  If so, then the recent fs/namespace.c patches from
> Eric Biederman would be suspect.

Yes, this is reproducible with:

kernel-4.1.0-0.rc2.git3.1.fc23.x86_64 (from Fedora Rawide)
fuse-2.9.3-4.fc22.x86_64

I will see if I can make a small reproducer and get back.

Rich.

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