linux-kernel - Re: [console_unlock] WARNING: at kernel/sched/clock.c:219 sched_clock

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Date:	Fri, 8 Feb 2013 12:52:16 +0800
From:	Hillf Danton <dhillf@...il.com>
To:	Fengguang Wu <fengguang.wu@...el.com>
Cc:	Johannes Weiner <hannes@...xchg.org>, Jan Kara <jack@...e.cz>,
	linux-kernel@...r.kernel.org
Subject: Re: [console_unlock] WARNING: at kernel/sched/clock.c:219 sched_clock_cpu()

Hello Fengguang

On Fri, Feb 8, 2013 at 10:06 AM, Fengguang Wu <fengguang.wu@...el.com> wrote:
> [    0.000000] Console: colour VGA+ 80x25
> [    0.000000] ------------[ cut here ]------------
> [    0.000000] WARNING: at /c/kernel-tests/src/linux/kernel/sched/clock.c:219 sched_clock_cpu+0x65/0x140()
> [    0.000000] Hardware name: Bochs
> [    0.000000] Modules linked in:
> [    0.000000] Pid: 0, comm: swapper Not tainted 3.8.0-rc6-mm1-00539-g83b324c #39
> [    0.000000] Call Trace:
> [    0.000000]  [<c102ba37>] warn_slowpath_common+0x87/0xb0
> [    0.000000]  [<c1063025>] ? sched_clock_cpu+0x65/0x140
> [    0.000000]  [<c1063025>] ? sched_clock_cpu+0x65/0x140
> [    0.000000]  [<c102ba82>] warn_slowpath_null+0x22/0x30
> [    0.000000]  [<c1063025>] sched_clock_cpu+0x65/0x140
> [    0.000000]  [<c102d8f9>] __console_unlock+0x39/0x490
> [    0.000000]  [<c12eeb23>] ? printk+0x3d/0x3f
> [    0.000000]  [<c102dd5d>] console_unlock+0xd/0x20
> [    0.000000]  [<c14bbbb0>] con_init+0x1fb/0x20e
> [    0.000000]  [<c14bb1b2>] console_init+0x12/0x20
> [    0.000000]  [<c149e969>] start_kernel+0x258/0x35f
> [    0.000000]  [<c149e4cc>] ? repair_env_string+0x51/0x51
> [    0.000000]  [<c149e376>] i386_start_kernel+0x12c/0x12f
> [    0.000000] ---[ end trace e006f8c3d589c9a1 ]---
>
Can you please try the following fix?

--- a/kernel/printk.c	Fri Feb  8 12:31:18 2013
+++ b/kernel/printk.c	Fri Feb  8 12:51:42 2013
@@ -2053,6 +2053,7 @@ static bool __console_unlock(void)
 		return false;
 	}

+	local_irq_save(flags);
 	console_may_schedule = 0;
 	cur_cpu = smp_processor_id();
 	/*
@@ -2062,6 +2063,7 @@ static bool __console_unlock(void)
 	end_time = sched_clock_cpu(cur_cpu) +
 				max_interrupt_disabled_duration() / 2;

+	local_irq_restore(flags);
 	/* flush buffered message fragment immediately to console */
 	console_cont_flush(text, sizeof(text));
 again:
--
--
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