Re: 2.6.20-git13 kernel BUG at /mnt/md0/devel/linux-git/kernel/time/tick-sched.c:168

[Thomas Gleixner <tglx@linutronix.de>]

On Sun, 2007-02-18 at 10:50 +0100, Alex Riesen wrote:
> > The arch/i386/kernel/process.c part of the patch should apply to 2.6.20
> > as well. Can you check if the problem is there too ?
> 
> It does not apply and does not look trivially hackable.
> The code for cpu_idle was introduced in 2ff2d3d7 "i386: add idle notifier".

Here you go.

	tglx

Index: linux-2.6.20/arch/i386/kernel/process.c
===================================================================
--- linux-2.6.20.orig/arch/i386/kernel/process.c
+++ linux-2.6.20/arch/i386/kernel/process.c
@@ -189,6 +189,13 @@ void cpu_idle(void)
 				play_dead();
 
 			__get_cpu_var(irq_stat).idle_timestamp = jiffies;
+
+			local_irq_disable();
+			if (local_softirq_pending() && !need_resched())
+				printk(KERN_ERR
+				       "Idle: local softirq pending: %04x\n",
+				       local_softirq_pending());
+			local_irq_enable();
 			idle();
 		}
 		preempt_enable_no_resched();