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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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