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    SubjectRe: 2.6.9-rc3-mm2
    On Tue, 5 Oct 2004, Hugh Dickins wrote:
    > On Tue, 5 Oct 2004, Peter Zijlstra wrote:
    > > On Mon, 2004-10-04 at 19:13, Pasi Savolainen wrote:
    > > > make: *** wait: No child processes. Stop.
    > > Just a simple mee too!
    > I've been suffering the occasional leftover zombie from multiple
    > kernel builds precisely since the preempt-smp.patch went in; been
    > hunting it unsuccessfully in spare moments, yesterday noticed that
    > bug, today realize it's probably what I've been hunting - I'm
    > about to start my own tests again, can't be sure until tomorrow.

    Yes, that _raw_read_trylock patch has fixed my zombie problem: since
    2.6.9-rc2-mm1 my repeated kernel builds would hang after several hours,
    with a zombie (usually cc1) on one cpu and its waiting parent (usually
    gcc) on another, with the puzzle of why the parent had never got woken -
    because do_wait's read_lock(&tasklist_lock) went ahead even while
    exit_notify held the write lock.


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