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    SubjectRe: 2.6.24-git2: Oracle 11g VKTM process enters R state on startup and is unkillable [still broken in 2.6.25-rc1]

    * Ingo Molnar <mingo@elte.hu> wrote:

    > no, they were not lost, they just didnt pass QA here (they crashed on
    > a particularly hard to debug 8-way box i have) and Peter worked on
    > that queue of fixes up until today to get it really correct. Could you
    > check:
    >
    > git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched.git
    >
    > combo patch below as well - whichever you prefer. The shortlog can be
    > found below as well - but i dont yet consider this pullable, i'd like
    > it to see pass a full night of randconfig tests on my test-systems.

    ok, we just found the reason for the 8-way crash, the delta fix from
    Peter is below if any of you have tried the previous combo patch.
    Updated sched.git as well, new HEAD is
    fec13e45305d69fd0bd23b30bd05a0a42cf341f8.

    Ingo

    Index: linux-2.6/kernel/sched.c
    ===================================================================
    --- linux-2.6.orig/kernel/sched.c
    +++ linux-2.6/kernel/sched.c
    @@ -219,6 +219,10 @@ static void start_rt_bandwidth(struct rt
    if (rt_b->rt_runtime == RUNTIME_INF)
    return;

    + if (hrtimer_active(&rt_b->rt_period_timer))
    + return;
    +
    + spin_lock(&rt_b->rt_runtime_lock);
    for (;;) {
    if (hrtimer_active(&rt_b->rt_period_timer))
    break;
    @@ -229,6 +233,7 @@ static void start_rt_bandwidth(struct rt
    rt_b->rt_period_timer.expires,
    HRTIMER_MODE_ABS);
    }
    + spin_unlock(&rt_b->rt_runtime_lock);
    }

    #ifdef CONFIG_RT_GROUP_SCHED

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