linux-kernel - Re: [PATCH v2 1/1] MIPS: Octeon: fix for held reboot

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Date:	Thu, 23 May 2013 10:05:00 -0700
From:	David Daney <ddaney.cavm@...il.com>
To:	Wladislav Wiebe <wladislav.kw@...il.com>
CC:	Ralf Baechle <ralf@...ux-mips.org>, david.daney@...ium.com,
	Maxim Uvarov <muvarov@...il.com>, davem@...emloft.net,
	linux-mips@...ux-mips.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] MIPS: Octeon: fix for held reboot_mutex lock at
 task exit time

On 05/23/2013 02:21 AM, Wladislav Wiebe wrote:
> When kernel halt's will reboot_mutex lock still hold at exit.
> It will issue with 'halt' command:
> $ halt
> ..
> Sent SIGKILL to all processes
> Requesting system halt
> [66.729373] System halted.
> [66.733244]
> [66.734761] =====================================
> [66.739473] [ BUG: lock held at task exit time! ]
> [66.744188] 3.8.7-0-sampleversion-fct #49 Tainted: G           O
> [66.750202] -------------------------------------
> [66.754913] init/21479 is exiting with locks still held!
> [66.760234] 1 lock held by init/21479:
> [66.763990]  #0:  (reboot_mutex){+.+...}, at: [<ffffffff801776c8>] SyS_reboot+0xe0/0x218
> [66.772165]
> [66.772165] stack backtrace:
> [66.776532] Call Trace:
> [66.778992] [<ffffffff805780a8>] dump_stack+0x8/0x34
> [66.783972] [<ffffffff801618b0>] do_exit+0x610/0xa70
> [66.788948] [<ffffffff801777a8>] SyS_reboot+0x1c0/0x218
> [66.794186] [<ffffffff8013d6a4>] handle_sys64+0x44/0x64
>
>
[...]
>
> Acked-by: Maxim Uvarov <muvarov@...il.com>
> Signed-off-by: Wladislav Wiebe <wladislav.kw@...il.com>
> ---
>   arch/mips/cavium-octeon/setup.c |    4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/arch/mips/cavium-octeon/setup.c b/arch/mips/cavium-octeon/setup.c
> index b0baa29..04ce396 100644
> --- a/arch/mips/cavium-octeon/setup.c
> +++ b/arch/mips/cavium-octeon/setup.c
> @@ -457,6 +457,10 @@ static void octeon_halt(void)
>   	}
>
>   	octeon_kill_core(NULL);
> +
> +	/* We stop here */
> +	while (1)
> +		;

I want to put a WAIT here so we don't burn so much power.

I will send a patch to do that instead.

>   }
>
>   /**
>

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