linux-kernel - Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate

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Date:	Wed, 17 Oct 2007 16:21:40 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, torvalds@...ux-foundation.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Andy Whitcroft <apw@...dowen.org>,
	Dmitry Adamushko <dmitry.adamushko@...il.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>,
	Mike Galbraith <efault@....de>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>
Subject: Re: [BUG] 2.6.23-git8 kernel oops at __rb_rotate_left+0x7/0x70


* Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com> wrote:

> While running kernbench with the 2.6.23-git8 following oops is 
> produced

Dmitry found something that might explain the crash: could you check 
whether the patch below fixes it?

	Ingo

---------------------->
Subject: sched: fix new task startup crash
From: Ingo Molnar <mingo@...e.hu>

this should fix the put_prev_task crashes that were reported,
Dmitry Adamushko noticed that it's not valid to call into
task_new_fair() if this_cpu != task_cpu(p).

Reported-by: Kamalesh Babulal <kamalesh@...ux.vnet.ibm.com>
Reported-by: Andy Whitcroft <apw@...dowen.org>
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -1712,7 +1712,8 @@ void fastcall wake_up_new_task(struct ta
 
 	p->prio = effective_prio(p);
 
-	if (!p->sched_class->task_new || !current->se.on_rq || !rq->cfs.curr) {
+	if (!p->sched_class->task_new || smp_processor_id() != task_cpu(p) ||
+			!current->se.on_rq || !rq->cfs.curr) {
 		activate_task(rq, p, 0);
 	} else {
 		/*
-
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