lkml.org 
[lkml]   [2009]   [Nov]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: regression, bisected: getcwd() ENOENT on NFS4...
    From
    Hi Trond,

    On Mon, Oct 26, 2009 at 1:19 PM, Trond Myklebust
    <Trond.Myklebust@netapp.com> wrote:
    > On Sun, 2009-10-25 at 23:31 +0000, Daniel J Blueman wrote:
    >> Since 2.6.30-rc, I've been experiencing various issues relating to
    >> getcwd() returning ENOENT on NFS4 clients. I used an over-complicated
    >> but reliable reproducer [1] (on Karmic RC against a 2.6.32-rc5 NFS4
    >> server) to bisect [2].
    >>
    >> The impact of this regression is moderate (side-effects range from
    >> benign to failure), so we should get a fix into 2.6.32 if at all
    >> possible and strongly consider a 2.6.31 stable update.
    >>
    >> Thanks,
    >>   Daniel
    >>
    >> --- [1]
    >>
    >> $ apt-get source apt
    >> $ cd apt-*
    >> $ ./configure && make
    >> [snip]
    >> sh: getcwd() failed: No such file or directory
    >>
    >> --- [2]
    >>
    >> a65318bf3afc93ce49227e849d213799b072c5fd is first bad commit
    >> commit a65318bf3afc93ce49227e849d213799b072c5fd
    >> Author: Trond Myklebust <Trond.Myklebust@netapp.com>
    >> Date:   Wed Mar 11 14:10:28 2009 -0400
    >>
    >>     NFSv4: Simplify some cache consistency post-op GETATTRs
    >
    > I'm having a lot of trouble seeing how this patch could result in
    > ENOENT. All it should be doing is reducing the frequency with which we
    > update some of the inode metadata.
    >
    > Have you ever been able to capture one of these errors using strace?

    Backing this patch out by hand against stock 2.6.32-rc5 (w/ 2.6.32-rc5
    on server) corrects the behaviour. It's readily reproducible [1];
    using 2.6.30, the issue is not seen, thus is a regression.

    To observe the change to user-level behaviour (after the reproducer commands):
    # make clean
    # strace -ffe getcwd make -n >list
    [pid 3829] getcwd(0x7fffa269a380, 4096) = -1 ENOENT (No such file or directory)
    make: getcwd: No such file or directory

    Would this help for me to log this via a bugzilla.kernel.org ticket?

    Thanks,
    Daniel

    --- [1]

    booting eg:
    http://mira.sunsite.utk.edu/ubuntu-releases/karmic/ubuntu-9.10-desktop-amd64.iso

    $ sudo bash
    # apt-get install build-essential
    # apt-get build-dep apt
    # mount server:/ /mnt -tnfs4 && cd /mnt
    # apt-get source apt
    # cd apt-0.7.23.1ubuntu2
    # ./configure && make
    -> "getcwd: No such file or directory" messages observed with cited
    patch and not without
    --
    Daniel J Blueman
    --
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2009-11-01 13:49    [W:0.026 / U:93.324 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site