linux-kernel - Re: [BUG] D state process after unplug and umount usb disk

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Message-ID: <CABqxG0cyXYFrC+ihYhWYS_kcpCULwW_GWrkJbptiCMNQ1e0NSA@mail.gmail.com>
Date:	Mon, 5 Sep 2011 09:21:53 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Lin Ming <mlin@...pku.edu.cn>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	fengguang.wu@...el.com, linux-usb@...r.kernel.org
Subject: Re: [BUG] D state process after unplug and umount usb disk

On Sun, Sep 4, 2011 at 10:25 PM, Lin Ming <mlin@...pku.edu.cn> wrote:
> On Sun, Sep 4, 2011 at 9:49 PM, Alan Stern <stern@...land.harvard.edu> wrote:
>>
>>> Where does this exit signal come from?
>>> Does USB interrupt handler will send kill signal to all processes
>>> accessing it when it's unplugged(by hand)?
>>
>> The USB stack does not send any signals at all unless a process
>> specifically asks for them.
>
> How to ask?
>
> I have not checked, but think umount code path will not send signal to process.
> Curiously, where does the exit signal come from?
>
> Dave,
> Did you press "Ctrl + C" on cat?

Yes and no. I press ctrl+C after it hang as D state

>
> Lin Ming
>



-- 
Regards
Yang RuiRui
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