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    SubjectRe: [Patch] Incoming XPC channel messages can come in after the channel's partition structures have been torn down.
    On Mon, Oct 18, 2010 at 12:40:55PM -0700, Andrew Morton wrote:
    > On Mon, 18 Oct 2010 08:35:08 -0500
    > Robin Holt <holt@sgi.com> wrote:
    >
    > > Under some workloads, some channel messages have been observed being
    > > delayed on the sending side past the point where the receiving side
    > > has been able to tear down its partition structures. This condition is
    > > already detected in xpc_handle_activate_IRQ_uv(), but that information
    > > is not given to xpc_handle_activate_mq_msg_uv(). As a result,
    > > xpc_handle_activate_mq_msg_uv() assumes the structures still exist and
    > > references them.
    >
    > With what result? Machine goes boom?
    >
    > Would you consider this a 2.6.36 fix? Backport to -stable?

    I would consider it a backport to stable. It is a NULL pointer deref.
    This pach applies back to 2.6.32. I did not try older kernels than
    that.

    Robin


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