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    SubjectRe: unionfs and sys_readahead
    In message <1194468220.5538.10.camel@albrecht.rdi1.com>, Paul Albrecht writes:
    > On Wed, 2007-11-07 at 19:53 +0000, Denys Vlasenko wrote:
    > > On Tuesday 06 November 2007 22:01, Paul Albrecht wrote:
    > > > Hi,
    > > >
    > > > Whenever I use readahead-list on a union mounted file system I get a
    > > > segfault and kernel oops so I'm wondering whether or not the linux
    > > > unionfs supports sys_readahead.
    > > >
    > > > Anyone know? I'm not usually subscribed to the lkml so please cc me in
    > > > your response. Thanks.
    > >
    > > Please show actual oops output.
    > >
    > > Also: what kernel version do you use? any extra patch(es) applied? .config?
    >
    > I'm using a stock generic kernel that's shipped with ubuntu. Here's my
    > dmesg output containing two oops. The first occurs during boot and the
    > second happens whenever I run readahead-list from the command line
    > against a file list containing an entry in a union mounted filesystem:
    [...]

    > [ 25.551441] Registering unionfs 1.4

    The problem appears most likely because this version of Ubuntu is still
    using the very old Unionfs 1.x. I wasn't able to reproduce the bug with the
    latest Unionfs 2.x. I'm in touch with the Ubuntu guys to try and help them
    move to 2.x.

    Cheers,
    Erez.
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