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    SubjectRe: 2.6.16-rc6-mm1 (NFS tree ... busy inodes ... relatively harmless)
    Neil Brown <neilb@suse.de> wrote:
    >
    > On Sunday March 12, akpm@osdl.org wrote:
    > >
    > > - The NFS tree is a bit sick - you may see the `busy inodes - self destruct
    > > in five seconds" message when performing NFS unmounts. It seems relatively
    > > harmless.
    >
    > I think the term is "mostly harmless" ... see the entry for "Earth" in
    > The Hitch-Hikers Guide To The Galaxy... :-)
    >
    > I don't believe this is harmless at all, and I have an oops to prove
    > it - though it is with NFSv4 which is still EXPERIMENTAL.
    >
    > I don't believe it is an NFS bug at all, but a VFS bug. It happens
    > more with NFS because iput on nfs can be a lot slower due to the
    > required network activity, so the race is easier to hit.

    It's 100% repeatable for me, with nfsv3 unmounts. First the busy inodes,
    then a use-after-free oops if CONFIG_DEBUG_PAGEALLOC (if that workaround
    patch I have in there isn't applied).

    Not a race, methinks.

    -
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