linux-kernel - Re: [sched/get_online_cpus] INFO: task swapper/0:1 blocked for more than 120 seconds.

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Date:	Wed, 13 Nov 2013 10:18:23 +0800
From:	Michael wang <wangyun@...ux.vnet.ibm.com>
To:	Fengguang Wu <fengguang.wu@...el.com>,
	Peter Zijlstra <peterz@...radead.org>
CC:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org
Subject: Re: [sched/get_online_cpus] INFO: task swapper/0:1 blocked for more
 than 120 seconds.

On 11/12/2013 05:55 PM, Fengguang Wu wrote:
[snip]
>>
>> Good thinking.. Wu did this cure stuff?

Thanks for the confirm :)

> 
> Yes, it fixed the problem.

Thanks for the testing :)

> 
> Tested-by: Fengguang Wu <fengguang.wu@...el.com>
> 

Will send out a formal patch later.

Regards,
Michael Wang

> 
> /kernel/i386-randconfig-j3-11101308/484f4e66a6a1102edf02407479f6f7632aade0f3
> 
> +--------------------------------------------------+--------------+--------------+
> |                                                  | e5137b50a064 | 484f4e66a6a1 |
> +--------------------------------------------------+--------------+--------------+
> | boot_successes                                   | 42           | 100          |
> | boot_failures                                    | 58           |              |
> | INFO:task_blocked_for_more_than_seconds          | 58           |              |
> | Kernel_panic-not_syncing:hung_task:blocked_tasks | 58           |              |
> +--------------------------------------------------+--------------+--------------+
> 
> /kernel/x86_64-randconfig-x4-1108/484f4e66a6a1102edf02407479f6f7632aade0f3
> 
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
> |                                                                                    | v3.12-rc7 | e5137b50a064 | 484f4e66a6a1 |
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
> | boot_successes                                                                     | 59        | 34           | 100          |
> | has_kernel_error_warning                                                           | 4         |              |              |
> | BUG:kernel_early_hang_without_any_printk_output                                    | 4         |              |              |
> | boot_failures                                                                      | 0         | 66           |              |
> | INFO:task_blocked_for_more_than_seconds                                            | 0         | 66           |              |
> | INFO:NMI_handler(arch_trigger_all_cpu_backtrace_handler)took_too_long_to_run:msecs | 0         | 55           |              |
> | Kernel_panic-not_syncing:hung_task:blocked_tasks                                   | 0         | 66           |              |
> +------------------------------------------------------------------------------------+-----------+--------------+--------------+
> 
> --
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