linux-kernel - Re: [BUG] local_softirq

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Message-ID: <20070522201046.GA6113@elte.hu>
Date:	Tue, 22 May 2007 22:10:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	Anant Nitya <kernel@...chanda.info>,
	linux-kernel@...r.kernel.org
Subject: Re: [BUG] local_softirq_pending storm


* Michal Piotrowski <michal.k.k.piotrowski@...il.com> wrote:

> Bad news - I hit a bug in 2.6.22-rc2-hrt3. Bug symptoms:
> - X hangs (keyboard, mouse, sound etc.)
> - only Magic SysRq works

please try the patch below! I think we have nailed this bug.

	Ingo

Index: linux/kernel/sched.c
===================================================================
--- linux.orig/kernel/sched.c
+++ linux/kernel/sched.c
@@ -4212,9 +4212,7 @@ int __sched cond_resched_softirq(void)
 	BUG_ON(!in_softirq());
 
 	if (need_resched() && system_state == SYSTEM_RUNNING) {
-		raw_local_irq_disable();
-		_local_bh_enable();
-		raw_local_irq_enable();
+		local_bh_enable();
 		__cond_resched();
 		local_bh_disable();
 		return 1;
-
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